本文接着分析jackrabbit与lucene交互的核心类SearchIndex，lucene的索引与检索都是通过该类实现的
SearchIndex类继承自抽象类AbstractQueryHandler，而抽象类AbstractQueryHandler实现了QueryHandler接口
先浏览一下QueryHandler接口源码：
/**
* Defines an interface for the actual node indexing and query execution.
* The goal is to allow different implementations based on the persistent
* manager in use. Some persistent model might allow to execute a query
* in an optimized manner, e.g. database persistence.
*/
public interface QueryHandler {
/**
* Initializes this query handler. This method is called after the
* <code>QueryHandler</code> is instantiated.
* <p>
* If a file system has been configured (i.e. the fs argument is not
* <code>null</code>), then the query handler is expected to close
* the given file system when the {@link #close()} method is called.
*
* @param fs the configured search index file system, or <code>null</code>
* @param context the context for this query handler.
* @throws IOException if an error occurs during initialization.
*/
void init(FileSystem fs, QueryHandlerContext context) throws IOException;
/**
* Returns the query handler context that passed in {@link
* #init(QueryHandlerContext)}.
*
* @return the query handler context.
*/
QueryHandlerContext getContext();
/**
* Adds a <code>Node</code> to the search index.
* @param node the NodeState to add.
* @throws RepositoryException if an error occurs while indexing the node.
* @throws IOException if an error occurs while adding the node to the index.
*/
void addNode(NodeState node) throws RepositoryException, IOException;
/**
* Deletes the Node with <code>id</code> from the search index.
* @param id the <code>id</code> of the node to delete.
* @throws IOException if an error occurs while deleting the node.
*/
void deleteNode(NodeId id) throws IOException;
/**
* Updates the index in an atomic operation. Some nodes may be removed and
* added again in the same updateNodes() call, which is equivalent to an
* node update.
*
* @param remove Iterator of <code>NodeIds</code> of nodes to delete
* @param add Iterator of <code>NodeState</code> instance to add to the
* index.
* @throws RepositoryException if an error occurs while indexing a node.
* @throws IOException if an error occurs while updating the index.
*/
void updateNodes(Iterator<NodeId> remove, Iterator<NodeState> add)
throws RepositoryException, IOException;
/**
* Closes this <code>QueryHandler</code> and frees resources attached
* to this handler.
*/
void close() throws IOException;
/**
* Creates a new query by specifying the query statement itself and the
* language in which the query is stated. If the query statement is
* syntactically invalid, given the language specified, an
* InvalidQueryException is thrown. <code>language</code> must specify a query language
* string from among those returned by QueryManager.getSupportedQueryLanguages(); if it is not
* then an <code>InvalidQueryException</code> is thrown.
*
* @param sessionContext component context of the current session
* @param statement the query statement.
* @param language the syntax of the query statement.
* @throws InvalidQueryException if statement is invalid or language is unsupported.
* @return A <code>Query</code> object.
*/
ExecutableQuery createExecutableQuery(
SessionContext sessionContext, String statement, String language)
throws InvalidQueryException;
/**
* @return the name of the query class to use.
*/
String getQueryClass();
/**
* Returns the ids of the nodes that refer to the node with <code>id</code>
* by weak references.
*
* @param id the id of the target node.
* @return the ids of the referring nodes.
* @throws RepositoryException if an error occurs.
* @throws IOException if an error occurs while reading from the
* index.
*/
public Iterable<NodeId> getWeaklyReferringNodes(NodeId id)
throws RepositoryException, IOException;
}
该接口的英文注释也说明了是用来实现node的索引与检索的，至于底层的实现方式则依赖于具体实现类（如文件方式或是数据库方式等）
接着继续看抽象类AbstractQueryHandler的源码：
/**
* Implements default behaviour for some methods of {@link QueryHandler}.
*/
public abstract class AbstractQueryHandler implements QueryHandler {
/**
* Logger instance for this class
*/
private static final Logger log = LoggerFactory.getLogger(AbstractQueryHandler.class);
/**
* Search index file system, or <code>null</code>
*/
protected FileSystem fs;
/**
* The context for this query handler.
*/
private QueryHandlerContext context;
/**
* The {@link OnWorkspaceInconsistency} handler. Defaults to 'fail'.
*/
private OnWorkspaceInconsistency owi = OnWorkspaceInconsistency.FAIL;
/**
* The name of a class that extends {@link AbstractQueryImpl}.
*/
private String queryClass = QueryImpl.class.getName();
/**
* The max idle time for this query handler until it is stopped. This
* property is actually not used anymore.
*/
private String idleTime;
/**
* Initializes this query handler by setting all properties in this class
* with appropriate parameter values.
*
* @param fs search index file system, or <code>null</code>
* @param context the context for this query handler.
*/
public final void init(FileSystem fs, QueryHandlerContext context)
throws IOException {
this.fs = fs;
this.context = context;
doInit();
}
public void close() throws IOException {
if (fs != null) {
try {
fs.close();
} catch (FileSystemException e) {
throw new IOExceptionWithCause(
"Unable to close search index file system: " + fs, e);
}
}
}
/**
* This method must be implemented by concrete sub classes and will be
* called from {@link #init}.
*
* @throws IOException If an error occurs.
*/
protected abstract void doInit() throws IOException;
/**
* Returns the context for this query handler.
*
* @return the <code>QueryHandlerContext</code> instance for this
* <code>QueryHandler</code>.
*/
public QueryHandlerContext getContext() {
return context;
}
/**
* This default implementation calls the individual {@link #deleteNode(org.apache.jackrabbit.core.NodeId)}
* and {@link #addNode(org.apache.jackrabbit.core.state.NodeState)} methods
* for each entry in the iterators. First the nodes to remove are processed
* then the nodes to add.
*
* @param remove uuids of nodes to remove.
* @param add NodeStates to add.
* @throws RepositoryException if an error occurs while indexing a node.
* @throws IOException if an error occurs while updating the index.
*/
public synchronized void updateNodes(
Iterator<NodeId> remove, Iterator<NodeState> add)
throws RepositoryException, IOException {
while (remove.hasNext()) {
deleteNode(remove.next());
}
while (add.hasNext()) {
addNode(add.next());
}
}
/**
* @return the {@link OnWorkspaceInconsistency} handler.
*/
public OnWorkspaceInconsistency getOnWorkspaceInconsistencyHandler() {
return owi;
}
//--------------------------< properties >----------------------------------
/**
* Sets the {@link OnWorkspaceInconsistency} handler with the given name.
* Currently the valid names are:
* <ul>
* <li><code>fail</code></li>
* <li><code>log</code></li>
* </ul>
*
* @param name the name of a {@link OnWorkspaceInconsistency} handler.
*/
public void setOnWorkspaceInconsistency(String name) {
owi = OnWorkspaceInconsistency.fromString(name);
}
/**
* @return the name of the currently set {@link OnWorkspaceInconsistency}.
*/
public String getOnWorkspaceInconsistency() {
return owi.getName();
}
/**
* Sets the name of the query class to use.
*
* @param queryClass the name of the query class to use.
*/
public void setQueryClass(String queryClass) {
this.queryClass = queryClass;
}
/**
* @return the name of the query class to use.
*/
public String getQueryClass() {
return queryClass;
}
/**
* Sets the query handler idle time.
* @deprecated
* This parameter is not supported any more.
* Please use 'maxIdleTime' in the repository configuration.
*
* @param idleTime the query handler idle time.
*/
public void setIdleTime(String idleTime) {
log.warn("Parameter 'idleTime' is not supported anymore. "
+ "Please use 'maxIdleTime' in the repository configuration.");
this.idleTime = idleTime;
}
/**
* @return the query handler idle time.
*/
public String getIdleTime() {
return idleTime;
}
}
抽象类可以不必实现接口的所有方法，英文注释说明该类提供了QueryHandler接口的部分方法的默认实现
同时在它的void init(FileSystem fs, QueryHandlerContext context)方法里面调用了访问模式为proteced类型的doInit()方法，这里的doInit()方法相当于模板方法,强制子类实现
其他的方法则是QueryHandler接口方法的默认实现
最后到真正的实现类SearchIndex的源码：
/**
* Implements a {@link org.apache.jackrabbit.core.query.QueryHandler} using
* Lucene.
*/
public class SearchIndex extends AbstractQueryHandler {
/**
* Valid node type names under /jcr:system. Used to determine if a
* query needs to be executed also against the /jcr:system tree.
*/
public static final Collection<Name> VALID_SYSTEM_INDEX_NODE_TYPE_NAMES =
Collections.unmodifiableCollection(Arrays.asList(
NameConstants.NT_CHILDNODEDEFINITION,
NameConstants.NT_FROZENNODE,
NameConstants.NT_NODETYPE,
NameConstants.NT_PROPERTYDEFINITION,
NameConstants.NT_VERSION,
NameConstants.NT_VERSIONEDCHILD,
NameConstants.NT_VERSIONHISTORY,
NameConstants.NT_VERSIONLABELS,
NameConstants.REP_NODETYPES,
NameConstants.REP_SYSTEM,
NameConstants.REP_VERSIONSTORAGE,
// Supertypes
NameConstants.NT_BASE,
NameConstants.MIX_REFERENCEABLE));
/**
* Default query node factory.
*/
private static final DefaultQueryNodeFactory DEFAULT_QUERY_NODE_FACTORY =
new DefaultQueryNodeFactory(VALID_SYSTEM_INDEX_NODE_TYPE_NAMES);
/** The logger instance for this class */
private static final Logger log = LoggerFactory.getLogger(SearchIndex.class);
/**
* Name of the file to persist search internal namespace mappings.
*/
private static final String NS_MAPPING_FILE = "ns_mappings.properties";
/**
* The default value for property {@link #minMergeDocs}.
*/
public static final int DEFAULT_MIN_MERGE_DOCS = 100;
/**
* The default value for property {@link #maxMergeDocs}.
*/
public static final int DEFAULT_MAX_MERGE_DOCS = Integer.MAX_VALUE;
/**
* the default value for property {@link #mergeFactor}.
*/
public static final int DEFAULT_MERGE_FACTOR = 10;
/**
* the default value for property {@link #maxFieldLength}.
*/
public static final int DEFAULT_MAX_FIELD_LENGTH = 10000;
/**
* The default value for property {@link #extractorPoolSize}.
* @deprecated this value is not used anymore. Instead the default value
* is calculated as follows: 2 * Runtime.getRuntime().availableProcessors().
*/
public static final int DEFAULT_EXTRACTOR_POOL_SIZE = 0;
/**
* The default value for property {@link #extractorBackLog}.
*/
public static final int DEFAULT_EXTRACTOR_BACK_LOG = Integer.MAX_VALUE;
/**
* The default timeout in milliseconds which is granted to the text
* extraction process until fulltext indexing is deferred to a background
* thread.
*/
public static final long DEFAULT_EXTRACTOR_TIMEOUT = 100;
/**
* The default value for {@link #termInfosIndexDivisor}.
*/
public static final int DEFAULT_TERM_INFOS_INDEX_DIVISOR = 1;
/**
* The path factory.
*/
protected static final PathFactory PATH_FACTORY = PathFactoryImpl.getInstance();
/**
* The path of the root node.
*/
protected static final Path ROOT_PATH;
/**
* The path <code>/jcr:system</code>.
*/
protected static final Path JCR_SYSTEM_PATH;
static {
ROOT_PATH = PATH_FACTORY.create(NameConstants.ROOT);
try {
JCR_SYSTEM_PATH = PATH_FACTORY.create(ROOT_PATH, NameConstants.JCR_SYSTEM, false);
} catch (RepositoryException e) {
// should never happen, path is always valid
throw new InternalError(e.getMessage());
}
}
/**
* The actual index
*/
protected MultiIndex index;
/**
* The analyzer we use for indexing.
*/
private final JackrabbitAnalyzer analyzer = new JackrabbitAnalyzer();
/**
* The parser for extracting text content from binary properties.
*/
private final JackrabbitParser parser = new JackrabbitParser();
/**
* The namespace mappings used internally.
*/
private NamespaceMappings nsMappings;
/**
* The location of the search index.
* <p/>
* Note: This is a <b>mandatory</b> parameter!
*/
private String path;
/**
* minMergeDocs config parameter.
*/
private int minMergeDocs = DEFAULT_MIN_MERGE_DOCS;
/**
* The maximum volatile index size in bytes until it is written to disk.
* The default value is 1048576 (1MB).
*/
private long maxVolatileIndexSize = 1024 * 1024;
/**
* volatileIdleTime config parameter.
*/
private int volatileIdleTime = 3;
/**
* The maximum age (in seconds) of the index history. The default value is
* zero. Which means, index commits are deleted as soon as they are not used
* anymore.
*/
private long maxHistoryAge = 0;
/**
* maxMergeDocs config parameter
*/
private int maxMergeDocs = DEFAULT_MAX_MERGE_DOCS;
/**
* mergeFactor config parameter
*/
private int mergeFactor = DEFAULT_MERGE_FACTOR;
/**
* maxFieldLength config parameter
*/
private int maxFieldLength = DEFAULT_MAX_FIELD_LENGTH;
/**
* maxExtractLength config parameter. Positive values are used as-is,
* negative values are interpreted as factors of the maxFieldLength
* parameter.
*/
private int maxExtractLength = -10;
/**
* extractorPoolSize config parameter
*/
private int extractorPoolSize = 2 * Runtime.getRuntime().availableProcessors();
/**
* extractorBackLog config parameter
*/
private int extractorBackLog = DEFAULT_EXTRACTOR_BACK_LOG;
/**
* extractorTimeout config parameter
*/
private long extractorTimeout = DEFAULT_EXTRACTOR_TIMEOUT;
/**
* Number of documents that are buffered before they are added to the index.
*/
private int bufferSize = 10;
/**
* Compound file flag
*/
private boolean useCompoundFile = true;
/**
* Flag indicating whether document order is enabled as the default
* ordering.
* <p/>
* Default value is: <code>false</code>.
*/
private boolean documentOrder = false;
/**
* If set <code>true</code> the index is checked for consistency on startup.
* If <code>false</code> a consistency check is only performed when there
* are entries in the redo log on startup.
* <p/>
* Default value is: <code>false</code>.
*/
private boolean forceConsistencyCheck = false;
/**
* If set <code>true</code> the index is checked for consistency depending
* on the {@link #forceConsistencyCheck} parameter. If set to
* <code>false</code>, no consistency check is performed, even if the redo
* log had been applied on startup.
* <p/>
* Default value is: <code>false</code>.
*/
private boolean consistencyCheckEnabled = false;
/**
* If set <code>true</code> errors detected by the consistency check are
* repaired. If <code>false</code> the errors are only reported in the log.
* <p/>
* Default value is: <code>true</code>.
*/
private boolean autoRepair = true;
/**
* The id resolver cache size.
* <p/>
* Default value is: <code>1000</code>.
*/
private int cacheSize = 1000;
/**
* The number of documents that are pre fetched when a query is executed.
* <p/>
* Default value is: {@link Integer#MAX_VALUE}.
*/
private int resultFetchSize = Integer.MAX_VALUE;
/**
* If set to <code>true</code> the fulltext field is stored and and a term
* vector is created with offset information.
* <p/>
* Default value is: <code>false</code>.
*/
private boolean supportHighlighting = false;
/**
* The excerpt provider class. Implements {@link ExcerptProvider}.
*/
private Class<?> excerptProviderClass = DefaultHTMLExcerpt.class;
/**
* The path to the indexing configuration file (can be an absolute path to a
* file or a classpath resource).
*/
private String indexingConfigPath;
/**
* The DOM with the indexing configuration or <code>null</code> if there
* is no such configuration.
*/
private Element indexingConfiguration;
/**
* The indexing configuration.
*/
private IndexingConfiguration indexingConfig;
/**
* The indexing configuration class.
* Implements {@link IndexingConfiguration}.
*/
private Class<?> indexingConfigurationClass = IndexingConfigurationImpl.class;
/**
* The class that implements {@link SynonymProvider}.
*/
private Class<?> synonymProviderClass;
/**
* The currently set synonym provider.
*/
private SynonymProvider synProvider;
/**
* The configuration path for the synonym provider.
*/
private String synonymProviderConfigPath;
/**
* The FileSystem for the synonym if the query handler context does not
* provide one.
*/
private FileSystem synonymProviderConfigFs;
/**
* Indicates the index format version which is relevant to a <b>query</b>. This
* value may be different from what {@link MultiIndex#getIndexFormatVersion()}
* returns because queries may be executed on two physical indexes with
* different formats. Index format versions are considered backward
* compatible. That is, the lower version of the two physical indexes is
* used for querying.
*/
private IndexFormatVersion indexFormatVersion;
/**
* The class that implements {@link SpellChecker}.
*/
private Class<?> spellCheckerClass;
/**
* The spell checker for this query handler or <code>null</code> if none is
* configured.
*/
private SpellChecker spellChecker;
/**
* The similarity in use for indexing and searching.
*/
private Similarity similarity = Similarity.getDefault();
/**
* The name of the directory manager class implementation.
*/
private String directoryManagerClass = FSDirectoryManager.class.getName();
/**
* The directory manager.
*/
private DirectoryManager directoryManager;
/**
* The termInfosIndexDivisor.
*/
private int termInfosIndexDivisor = DEFAULT_TERM_INFOS_INDEX_DIVISOR;
/**
* The sort comparator source for indexed properties.
*/
private SortComparatorSource scs;
/**
* Flag that indicates whether the hierarchy cache should be initialized
* immediately on startup.
*/
private boolean initializeHierarchyCache = true;
/**
* The name of the redo log factory class implementation.
*/
private String redoLogFactoryClass = DefaultRedoLogFactory.class.getName();
/**
* The redo log factory.
*/
private RedoLogFactory redoLogFactory;
/**
* Indicates if this <code>SearchIndex</code> is closed and cannot be used
* anymore.
*/
private boolean closed = false;
/**
* Initializes this <code>QueryHandler</code>. This implementation requires
* that a path parameter is set in the configuration. If this condition
* is not met, a <code>IOException</code> is thrown.
*
* @throws IOException if an error occurs while initializing this handler.
*/
protected void doInit() throws IOException {
QueryHandlerContext context = getContext();
if (path == null) {
throw new IOException("SearchIndex requires 'path' parameter in configuration!");
}
Set<NodeId> excludedIDs = new HashSet<NodeId>();
if (context.getExcludedNodeId() != null) {
excludedIDs.add(context.getExcludedNodeId());
}
synProvider = createSynonymProvider();
directoryManager = createDirectoryManager();
redoLogFactory = createRedoLogFactory();
if (context.getParentHandler() instanceof SearchIndex) {
// use system namespace mappings
SearchIndex sysIndex = (SearchIndex) context.getParentHandler();
nsMappings = sysIndex.getNamespaceMappings();
} else {
// read local namespace mappings
File mapFile = new File(new File(path), NS_MAPPING_FILE);
if (mapFile.exists()) {
// be backward compatible and use ns_mappings.properties from
// index folder
nsMappings = new FileBasedNamespaceMappings(mapFile);
} else {
// otherwise use repository wide stable index prefix from
// namespace registry
nsMappings = new NSRegistryBasedNamespaceMappings(
context.getNamespaceRegistry());
}
}
scs = new SharedFieldSortComparator(
FieldNames.PROPERTIES, context.getItemStateManager(),
context.getHierarchyManager(), nsMappings);
indexingConfig = createIndexingConfiguration(nsMappings);
analyzer.setIndexingConfig(indexingConfig);
index = new MultiIndex(this, excludedIDs);
if (index.numDocs() == 0) {
Path rootPath;
if (excludedIDs.isEmpty()) {
// this is the index for jcr:system
rootPath = JCR_SYSTEM_PATH;
} else {
rootPath = ROOT_PATH;
}
index.createInitialIndex(context.getItemStateManager(),
context.getRootId(), rootPath);
}
if (consistencyCheckEnabled
&& (index.getRedoLogApplied() || forceConsistencyCheck)) {
log.info("Running consistency check...");
try {
ConsistencyCheck check = runConsistencyCheck();
if (autoRepair) {
check.repair(true);
} else {
List<ConsistencyCheckError> errors = check.getErrors();
if (errors.size() == 0) {
log.info("No errors detected.");
}
for (ConsistencyCheckError err : errors) {
log.info(err.toString());
}
}
} catch (Exception e) {
log.warn("Failed to run consistency check on index: " + e);
}
}
// initialize spell checker
spellChecker = createSpellChecker();
log.info("Index initialized: {} Version: {}",
new Object[]{path, index.getIndexFormatVersion()});
if (!index.getIndexFormatVersion().equals(getIndexFormatVersion())) {
log.warn("Using Version {} for reading. Please re-index version " +
"storage for optimal performance.",
getIndexFormatVersion().getVersion());
}
}
/**
* Adds the <code>node</code> to the search index.
* @param node the node to add.
* @throws RepositoryException if an error occurs while indexing the node.
* @throws IOException if an error occurs while adding the node to the index.
*/
public void addNode(NodeState node) throws RepositoryException, IOException {
throw new UnsupportedOperationException("addNode");
}
/**
* Removes the node with <code>id</code> from the search index.
* @param id the id of the node to remove from the index.
* @throws IOException if an error occurs while removing the node from
* the index.
*/
public void deleteNode(NodeId id) throws IOException {
throw new UnsupportedOperationException("deleteNode");
}
/**
* This implementation forwards the call to
* {@link MultiIndex#update(Collection, Collection)} and
* transforms the two iterators to the required types.
*
* @param remove ids of nodes to remove.
* @param add NodeStates to add. Calls to <code>next()</code> on this
* iterator may return <code>null</code>, to indicate that a
* node could not be indexed successfully.
* @throws RepositoryException if an error occurs while indexing a node.
* @throws IOException if an error occurs while updating the index.
*/
public void updateNodes(Iterator<NodeId> remove, Iterator<NodeState> add)
throws RepositoryException, IOException {
checkOpen();
Map<NodeId, NodeState> aggregateRoots = new HashMap<NodeId, NodeState>();
Set<NodeId> removedIds = new HashSet<NodeId>();
Set<NodeId> addedIds = new HashSet<NodeId>();
Collection<NodeId> removeCollection = new ArrayList<NodeId>();
while (remove.hasNext()) {
NodeId id = remove.next();
removeCollection.add(id);
removedIds.add(id);
}
Collection<Document> addCollection = new ArrayList<Document>();
while (add.hasNext()) {
NodeState state = add.next();
if (state != null) {
NodeId id = state.getNodeId();
addedIds.add(id);
removedIds.remove(id);
retrieveAggregateRoot(state, aggregateRoots);
try {
addCollection.add(createDocument(
state, getNamespaceMappings(),
index.getIndexFormatVersion()));
} catch (RepositoryException e) {
log.warn("Exception while creating document for node: "
+ state.getNodeId() + ": " + e.toString());
}
}
}
index.update(removeCollection, addCollection);
// remove any aggregateRoot nodes that are new
// and therefore already up-to-date
aggregateRoots.keySet().removeAll(addedIds);
// based on removed ids get affected aggregate root nodes
retrieveAggregateRoot(removedIds, aggregateRoots);
// update aggregates if there are any affected
if (!aggregateRoots.isEmpty()) {
Collection<Document> modified =
new ArrayList<Document>(aggregateRoots.size());
for (NodeState state : aggregateRoots.values()) {
try {
modified.add(createDocument(
state, getNamespaceMappings(),
index.getIndexFormatVersion()));
} catch (RepositoryException e) {
log.warn("Exception while creating document for node: "
+ state.getNodeId(), e);
}
}
index.update(aggregateRoots.keySet(), modified);
}
}
/**
* Creates a new query by specifying the query statement itself and the
* language in which the query is stated. If the query statement is
* syntactically invalid, given the language specified, an
* InvalidQueryException is thrown. <code>language</code> must specify a query language
* string from among those returned by QueryManager.getSupportedQueryLanguages(); if it is not
* then an <code>InvalidQueryException</code> is thrown.
*
* @param sessionContext component context of the current session
* @param statement the query statement.
* @param language the syntax of the query statement.
* @throws InvalidQueryException if statement is invalid or language is unsupported.
* @return A <code>Query</code> object.
*/
public ExecutableQuery createExecutableQuery(
SessionContext sessionContext, String statement, String language)
throws InvalidQueryException {
QueryImpl query = new QueryImpl(
sessionContext, this, getContext().getPropertyTypeRegistry(),
statement, language, getQueryNodeFactory());
query.setRespectDocumentOrder(documentOrder);
return query;
}
/**
* {@inheritDoc}
*/
public Iterable<NodeId> getWeaklyReferringNodes(NodeId id)
throws RepositoryException, IOException {
final List<Integer> docs = new ArrayList<Integer>();
final List<NodeId> ids = new ArrayList<NodeId>();
final IndexReader reader = getIndexReader();
try {
IndexSearcher searcher = new IndexSearcher(reader);
try {
Query q = new TermQuery(new Term(
FieldNames.WEAK_REFS, id.toString()));
searcher.search(q, new HitCollector() {
public void collect(int doc, float score) {
docs.add(doc);
}
});
} finally {
searcher.close();
}
for (Integer doc : docs) {
Document d = reader.document(doc, FieldSelectors.UUID);
ids.add(new NodeId(d.get(FieldNames.UUID)));
}
} finally {
Util.closeOrRelease(reader);
}
return ids;
}
/**
* This method returns the QueryNodeFactory used to parse Queries. This method
* may be overridden to provide a customized QueryNodeFactory
*
* @return the query node factory.
*/
protected DefaultQueryNodeFactory getQueryNodeFactory() {
return DEFAULT_QUERY_NODE_FACTORY;
}
/**
* Waits until all pending text extraction tasks have been processed
* and the updated index has been flushed to disk.
*
* @throws RepositoryException if the index update can not be written
*/
public void flush() throws RepositoryException {
try {
index.waitUntilIndexingQueueIsEmpty();
index.flush();
// flush may have pushed nodes into the indexing queue
// -> wait again
index.waitUntilIndexingQueueIsEmpty();
} catch (IOException e) {
throw new RepositoryException("Failed to flush the index", e);
}
}
/**
* Closes this <code>QueryHandler</code> and frees resources attached
* to this handler.
*/
public void close() throws IOException {
if (synonymProviderConfigFs != null) {
try {
synonymProviderConfigFs.close();
} catch (FileSystemException e) {
log.warn("Exception while closing FileSystem", e);
}
}
if (spellChecker != null) {
spellChecker.close();
}
index.close();
getContext().destroy();
super.close();
closed = true;
log.info("Index closed: " + path);
}
/**
* Executes the query on the search index.
*
* @param session the session that executes the query.
* @param queryImpl the query impl.
* @param query the lucene query.
* @param orderProps name of the properties for sort order.
* @param orderSpecs the order specs for the sort order properties.
* <code>true</code> indicates ascending order,
* <code>false</code> indicates descending.
* @param resultFetchHint a hint on how many results should be fetched.
* @return the query hits.
* @throws IOException if an error occurs while searching the index.
*/
public MultiColumnQueryHits executeQuery(SessionImpl session,
AbstractQueryImpl queryImpl,
Query query,
Path[] orderProps,
boolean[] orderSpecs,
long resultFetchHint)
throws IOException {
checkOpen();
Sort sort = new Sort(createSortFields(orderProps, orderSpecs));
final IndexReader reader = getIndexReader(queryImpl.needsSystemTree());
JackrabbitIndexSearcher searcher = new JackrabbitIndexSearcher(
session, reader, getContext().getItemStateManager());
searcher.setSimilarity(getSimilarity());
return new FilterMultiColumnQueryHits(
searcher.execute(query, sort, resultFetchHint,
QueryImpl.DEFAULT_SELECTOR_NAME)) {
public void close() throws IOException {
try {
super.close();
} finally {
Util.closeOrRelease(reader);
}
}
};
}
/**
* Executes the query on the search index.
*
* @param session the session that executes the query.
* @param query the query.
* @param orderings the order specs for the sort order.
* @param resultFetchHint a hint on how many results should be fetched.
* @return the query hits.
* @throws IOException if an error occurs while searching the index.
*/
public MultiColumnQueryHits executeQuery(SessionImpl session,
MultiColumnQuery query,
Ordering[] orderings,
long resultFetchHint)
throws IOException {
checkOpen();
final IndexReader reader = getIndexReader();
JackrabbitIndexSearcher searcher = new JackrabbitIndexSearcher(
session, reader, getContext().getItemStateManager());
searcher.setSimilarity(getSimilarity());
return new FilterMultiColumnQueryHits(
query.execute(searcher, orderings, resultFetchHint)) {
public void close() throws IOException {
try {
super.close();
} finally {
Util.closeOrRelease(reader);
}
}
};
}
/**
* Creates an excerpt provider for the given <code>query</code>.
*
* @param query the query.
* @return an excerpt provider for the given <code>query</code>.
* @throws IOException if the provider cannot be created.
*/
public ExcerptProvider createExcerptProvider(Query query)
throws IOException {
ExcerptProvider ep;
try {
ep = (ExcerptProvider) excerptProviderClass.newInstance();
} catch (Exception e) {
throw Util.createIOException(e);
}
ep.init(query, this);
return ep;
}
/**
* Returns the analyzer in use for indexing.
* @return the analyzer in use for indexing.
*/
public Analyzer getTextAnalyzer() {
return analyzer;
}
/**
* Returns the parser used for extracting text content
* from binary properties for full text indexing.
*
* @return the configured parser
*/
public Parser getParser() {
return parser;
}
/**
* Returns the namespace mappings for the internal representation.
* @return the namespace mappings for the internal representation.
*/
public NamespaceMappings getNamespaceMappings() {
return nsMappings;
}
/**
* @return the indexing configuration or <code>null</code> if there is
* none.
*/
public IndexingConfiguration getIndexingConfig() {
return indexingConfig;
}
/**
* @return the synonym provider of this search index. If none is set for
* this search index the synonym provider of the parent handler is
* returned if there is any.
*/
public SynonymProvider getSynonymProvider() {
if (synProvider != null) {
return synProvider;
} else {
QueryHandler handler = getContext().getParentHandler();
if (handler instanceof SearchIndex) {
return ((SearchIndex) handler).getSynonymProvider();
} else {
return null;
}
}
}
/**
* @return the spell checker of this search index. If none is configured
* this method returns <code>null</code>.
*/
public SpellChecker getSpellChecker() {
return spellChecker;
}
/**
* @return the similarity, which should be used for indexing and searching.
*/
public Similarity getSimilarity() {
return similarity;
}
/**
* Returns an index reader for this search index. The caller of this method
* is responsible for closing the index reader when he is finished using
* it.
*
* @return an index reader for this search index.
* @throws IOException the index reader cannot be obtained.
*/
public IndexReader getIndexReader() throws IOException {
return getIndexReader(true);
}
/**
* Returns the index format version that this search index is able to
* support when a query is executed on this index.
*
* @return the index format version for this search index.
*/
public IndexFormatVersion getIndexFormatVersion() {
if (indexFormatVersion == null) {
if (getContext().getParentHandler() instanceof SearchIndex) {
SearchIndex parent = (SearchIndex) getContext().getParentHandler();
if (parent.getIndexFormatVersion().getVersion()
< index.getIndexFormatVersion().getVersion()) {
indexFormatVersion = parent.getIndexFormatVersion();
} else {
indexFormatVersion = index.getIndexFormatVersion();
}
} else {
indexFormatVersion = index.getIndexFormatVersion();
}
}
return indexFormatVersion;
}
/**
* @return the directory manager for this search index.
*/
public DirectoryManager getDirectoryManager() {
return directoryManager;
}
/**
* @return the redo log factory for this search index.
*/
public RedoLogFactory getRedoLogFactory() {
return redoLogFactory;
}
/**
* Runs a consistency check on this search index.
*
* @return the result of the consistency check.
* @throws IOException if an error occurs while running the check.
*/
public ConsistencyCheck runConsistencyCheck() throws IOException {
return index.runConsistencyCheck();
}
/**
* Returns an index reader for this search index. The caller of this method
* is responsible for closing the index reader when he is finished using
* it.
*
* @param includeSystemIndex if <code>true</code> the index reader will
* cover the complete workspace. If
* <code>false</code> the returned index reader
* will not contains any nodes under /jcr:system.
* @return an index reader for this search index.
* @throws IOException the index reader cannot be obtained.
*/
protected IndexReader getIndexReader(boolean includeSystemIndex)
throws IOException {
QueryHandler parentHandler = getContext().getParentHandler();
CachingMultiIndexReader parentReader = null;
if (parentHandler instanceof SearchIndex && includeSystemIndex) {
parentReader = ((SearchIndex) parentHandler).index.getIndexReader();
}
IndexReader reader;
if (parentReader != null) {
CachingMultiIndexReader[] readers = {index.getIndexReader(), parentReader};
reader = new CombinedIndexReader(readers);
} else {
reader = index.getIndexReader();
}
return new JackrabbitIndexReader(reader);
}
/**
* Creates the SortFields for the order properties.
*
* @param orderProps the order properties.
* @param orderSpecs the order specs for the properties.
* @return an array of sort fields
*/
protected SortField[] createSortFields(Path[] orderProps,
boolean[] orderSpecs) {
List<SortField> sortFields = new ArrayList<SortField>();
for (int i = 0; i < orderProps.length; i++) {
if (orderProps[i].getLength() == 1
&& NameConstants.JCR_SCORE.equals(orderProps[i].getName())) {
// order on jcr:score does not use the natural order as
// implemented in lucene. score ascending in lucene means that
// higher scores are first. JCR specs that lower score values
// are first.
sortFields.add(new SortField(null, SortField.SCORE, orderSpecs[i]));
} else {
sortFields.add(new SortField(orderProps[i].getString(), scs, !orderSpecs[i]));
}
}
return sortFields.toArray(new SortField[sortFields.size()]);
}
/**
* Creates internal orderings for the QOM ordering specifications.
*
* @param orderings the QOM ordering specifications.
* @return the internal orderings.
* @throws RepositoryException if an error occurs.
*/
protected Ordering[] createOrderings(OrderingImpl[] orderings)
throws RepositoryException {
Ordering[] ords = new Ordering[orderings.length];
for (int i = 0; i < orderings.length; i++) {
ords[i] = Ordering.fromQOM(orderings[i], scs, nsMappings);
}
return ords;
}
/**
* Creates a lucene <code>Document</code> for a node state using the
* namespace mappings <code>nsMappings</code>.
*
* @param node the node state to index.
* @param nsMappings the namespace mappings of the search index.
* @param indexFormatVersion the index format version that should be used to
* index the passed node state.
* @return a lucene <code>Document</code> that contains all properties of
* <code>node</code>.
* @throws RepositoryException if an error occurs while indexing the
* <code>node</code>.
*/
protected Document createDocument(NodeState node,
NamespaceMappings nsMappings,
IndexFormatVersion indexFormatVersion)
throws RepositoryException {
NodeIndexer indexer = new NodeIndexer(
node, getContext().getItemStateManager(), nsMappings,
getContext().getExecutor(), parser);
indexer.setSupportHighlighting(supportHighlighting);
indexer.setIndexingConfiguration(indexingConfig);
indexer.setIndexFormatVersion(indexFormatVersion);
indexer.setMaxExtractLength(getMaxExtractLength());
Document doc = indexer.createDoc();
mergeAggregatedNodeIndexes(node, doc, indexFormatVersion);
return doc;
}
/**
* Returns the actual index.
*
* @return the actual index.
*/
protected MultiIndex getIndex() {
return index;
}
/**
* @return the sort comparator source for this index.
*/
protected SortComparatorSource getSortComparatorSource() {
return scs;
}
/**
* @param namespaceMappings The namespace mappings
* @return the fulltext indexing configuration or <code>null</code> if there
* is no configuration.
*/
protected IndexingConfiguration createIndexingConfiguration(NamespaceMappings namespaceMappings) {
Element docElement = getIndexingConfigurationDOM();
if (docElement == null) {
return null;
}
try {
IndexingConfiguration idxCfg = (IndexingConfiguration)
indexingConfigurationClass.newInstance();
idxCfg.init(docElement, getContext(), namespaceMappings);
return idxCfg;
} catch (Exception e) {
log.warn("Exception initializing indexing configuration from: "
+ indexingConfigPath, e);
}
log.warn(indexingConfigPath + " ignored.");
return null;
}
/**
* @return the configured synonym provider or <code>null</code> if none is
* configured or an error occurs.
*/
protected SynonymProvider createSynonymProvider() {
SynonymProvider sp = null;
if (synonymProviderClass != null) {
try {
sp = (SynonymProvider) synonymProviderClass.newInstance();
sp.initialize(createSynonymProviderConfigResource());
} catch (Exception e) {
log.warn("Exception initializing synonym provider: "
+ synonymProviderClass, e);
sp = null;
}
}
return sp;
}
/**
* @return an initialized {@link DirectoryManager}.
* @throws IOException if the directory manager cannot be instantiated or
* an exception occurs while initializing the manager.
*/
protected DirectoryManager createDirectoryManager()
throws IOException {
try {
Class<?> clazz = Class.forName(directoryManagerClass);
if (!DirectoryManager.class.isAssignableFrom(clazz)) {
throw new IOException(directoryManagerClass +
" is not a DirectoryManager implementation");
}
DirectoryManager df = (DirectoryManager) clazz.newInstance();
df.init(this);
return df;
} catch (IOException e) {
throw e;
} catch (Exception e) {
IOException ex = new IOException();
ex.initCause(e);
throw ex;
}
}
/**
* Creates a redo log factory based on {@link #getRedoLogFactoryClass()}.
*
* @return the redo log factory.
* @throws IOException if an error occurs while creating the factory.
*/
protected RedoLogFactory createRedoLogFactory() throws IOException {
try {
Class<?> clazz = Class.forName(redoLogFactoryClass);
if (!RedoLogFactory.class.isAssignableFrom(clazz)) {
throw new IOException(redoLogFactoryClass +
" is not a RedoLogFactory implementation");
}
return (RedoLogFactory) clazz.newInstance();
} catch (Exception e) {
IOException ex = new IOException();
ex.initCause(e);
throw ex;
}
}
/**
* Creates a file system resource to the synonym provider configuration.
*
* @return a file system resource or <code>null</code> if no path was
* configured.
* @throws FileSystemException if an exception occurs accessing the file
* system.
* @throws IOException if another exception occurs.
*/
protected FileSystemResource createSynonymProviderConfigResource()
throws FileSystemException, IOException {
if (synonymProviderConfigPath != null) {
FileSystemResource fsr;
// simple sanity check
if (synonymProviderConfigPath.endsWith(FileSystem.SEPARATOR)) {
throw new FileSystemException(
"Invalid synonymProviderConfigPath: "
+ synonymProviderConfigPath);
}
if (fs == null) {
fs = new LocalFileSystem();
int lastSeparator = synonymProviderConfigPath.lastIndexOf(
FileSystem.SEPARATOR_CHAR);
if (lastSeparator != -1) {
File root = new File(path,
synonymProviderConfigPath.substring(0, lastSeparator));
((LocalFileSystem) fs).setRoot(root.getCanonicalFile());
fs.init();
fsr = new FileSystemResource(fs,
synonymProviderConfigPath.substring(lastSeparator + 1));
} else {
((LocalFileSystem) fs).setPath(path);
fs.init();
fsr = new FileSystemResource(fs, synonymProviderConfigPath);
}
synonymProviderConfigFs = fs;
} else {
fsr = new FileSystemResource(fs, synonymProviderConfigPath);
}
return fsr;
} else {
// path not configured
return null;
}
}
/**
* Creates a spell checker for this query handler.
*
* @return the spell checker or <code>null</code> if none is configured or
* an error occurs.
*/
protected SpellChecker createSpellChecker() {
SpellChecker spCheck = null;
if (spellCheckerClass != null) {
try {
spCheck = (SpellChecker) spellCheckerClass.newInstance();
spCheck.init(this);
} catch (Exception e) {
log.warn("Exception initializing spell checker: "
+ spellCheckerClass, e);
}
}
return spCheck;
}
/**
* Returns the document element of the indexing configuration or
* <code>null</code> if there is no indexing configuration.
*
* @return the indexing configuration or <code>null</code> if there is
* none.
*/
protected Element getIndexingConfigurationDOM() {
if (indexingConfiguration != null) {
return indexingConfiguration;
}
if (indexingConfigPath == null) {
return null;
}
File config = new File(indexingConfigPath);
InputStream configStream = null;
if (!config.exists()) {
// check if it's a classpath resource
configStream = getClass().getResourceAsStream(indexingConfigPath);
if (configStream == null) {
// only warn if not available also in the classpath
log.warn("File does not exist: " + indexingConfigPath);
return null;
}
} else if (!config.canRead()) {
log.warn("Cannot read file: " + indexingConfigPath);
return null;
}
try {
DocumentBuilderFactory factory =
DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
builder.setEntityResolver(new IndexingConfigurationEntityResolver());
if (configStream != null) {
indexingConfiguration = builder
.parse(configStream).getDocumentElement();
} else {
indexingConfiguration = builder
.parse(config).getDocumentElement();
}
} catch (ParserConfigurationException e) {
log.warn("Unable to create XML parser", e);
} catch (IOException e) {
log.warn("Exception parsing " + indexingConfigPath, e);
} catch (SAXException e) {
log.warn("Exception parsing " + indexingConfigPath, e);
} finally {
if (configStream != null) {
try {
configStream.close();
} catch (IOException e) {
// ignore
}
}
}
return indexingConfiguration;
}
/**
* Merges the fulltext indexed fields of the aggregated node states into
* <code>doc</code>.
*
* @param state the node state on which <code>doc</code> was created.
* @param doc the lucene document with index fields from <code>state</code>.
* @param ifv the current index format version.
*/
protected void mergeAggregatedNodeIndexes(NodeState state,
Document doc,
IndexFormatVersion ifv) {
if (indexingConfig != null) {
AggregateRule[] aggregateRules = indexingConfig.getAggregateRules();
if (aggregateRules == null) {
return;
}
try {
ItemStateManager ism = getContext().getItemStateManager();
for (AggregateRule aggregateRule : aggregateRules) {
boolean ruleMatched = false;
// node includes
NodeState[] aggregates = aggregateRule.getAggregatedNodeStates(state);
if (aggregates != null) {
ruleMatched = true;
for (NodeState aggregate : aggregates) {
Document aDoc = createDocument(aggregate, getNamespaceMappings(), ifv);
// transfer fields to doc if there are any
Fieldable[] fulltextFields = aDoc.getFieldables(FieldNames.FULLTEXT);
if (fulltextFields != null) {
for (Fieldable fulltextField : fulltextFields) {
doc.add(fulltextField);
}
doc.add(new Field(FieldNames.AGGREGATED_NODE_UUID, aggregate.getNodeId().toString(), Field.Store.NO, Field.Index.NOT_ANALYZED_NO_NORMS));
}
}
// make sure that fulltext fields are aligned properly
// first all stored fields, then remaining
List<Fieldable> fulltextFields = new ArrayList<Fieldable>();
fulltextFields.addAll(removeFields(doc, FieldNames.FULLTEXT));
Collections.sort(fulltextFields, new Comparator<Fieldable>() {
public int compare(Fieldable o1, Fieldable o2) {
return Boolean.valueOf(o2.isStored()).compareTo(o1.isStored());
}
});
for (Fieldable f : fulltextFields) {
doc.add(f);
}
}
// property includes
PropertyState[] propStates = aggregateRule.getAggregatedPropertyStates(state);
if (propStates != null) {
ruleMatched = true;
for (PropertyState propState : propStates) {
String namePrefix = FieldNames.createNamedValue(getNamespaceMappings().translateName(propState.getName()), "");
NodeState parent = (NodeState) ism.getItemState(propState.getParentId());
Document aDoc = createDocument(parent, getNamespaceMappings(), ifv);
try {
// find the right fields to transfer
Fieldable[] fields = aDoc.getFieldables(FieldNames.PROPERTIES);
Token t = new Token();
for (Fieldable field : fields) {
// assume properties fields use SingleTokenStream
t = field.tokenStreamValue().next(t);
String value = new String(t.termBuffer(), 0, t.termLength());
if (value.startsWith(namePrefix)) {
// extract value
value = value.substring(namePrefix.length());
// create new named value
Path p = getRelativePath(state, propState);
String path = getNamespaceMappings().translatePath(p);
value = FieldNames.createNamedValue(path, value);
t.setTermBuffer(value);
doc.add(new Field(field.name(), new SingletonTokenStream(t)));
doc.add(new Field(FieldNames.AGGREGATED_NODE_UUID, parent.getNodeId().toString(), Field.Store.NO, Field.Index.NOT_ANALYZED_NO_NORMS));
}
}
} finally {
Util.disposeDocument(aDoc);
}
}
}
// only use first aggregate definition that matches
if (ruleMatched) {
break;
}
}
} catch (Exception e) {
// do not fail if aggregate cannot be created
log.warn("Exception while building indexing aggregate for"
+ " node with id: " + state.getNodeId(), e);
}
}
}
/**
* Removes the fields with the given <code>name</code> from the
* <code>document</code> and returns them in a collection.
*
* @param document the document.
* @param name the name of the fields to remove.
* @return the removed fields.
*/
protected final Collection<Fieldable> removeFields(Document document,
String name) {
List<Fieldable> fields = new ArrayList<Fieldable>();
fields.addAll(Arrays.asList(document.getFieldables(name)));
document.removeFields(FieldNames.FULLTEXT);
return fields;
}
/**
* Returns the relative path from <code>nodeState</code> to
* <code>propState</code>.
*
* @param nodeState a node state.
* @param propState a property state.
* @return the relative path.
* @throws RepositoryException if an error occurs while resolving paths.
* @throws ItemStateException if an error occurs while reading item
* states.
*/
protected Path getRelativePath(NodeState nodeState, PropertyState propState)
throws RepositoryException, ItemStateException {
HierarchyManager hmgr = getContext().getHierarchyManager();
Path nodePath = hmgr.getPath(nodeState.getId());
Path propPath = hmgr.getPath(propState.getId());
Path p = nodePath.computeRelativePath(propPath);
// make sure it does not contain indexes
boolean clean = true;
Path.Element[] elements = p.getElements();
for (int i = 0; i < elements.length; i++) {
if (elements[i].getIndex() != 0) {
elements[i] = PATH_FACTORY.createElement(elements[i].getName());
clean = false;
}
}
if (!clean) {
p = PATH_FACTORY.create(elements);
}
return p;
}
/**
* Retrieves the root of the indexing aggregate for <code>state</code> and
* puts it into <code>map</code>.
*
* @param state the node state for which we want to retrieve the aggregate
* root.
* @param map aggregate roots are collected in this map.
*/
protected void retrieveAggregateRoot(
NodeState state, Map<NodeId, NodeState> map) {
if (indexingConfig != null) {
AggregateRule[] aggregateRules = indexingConfig.getAggregateRules();
if (aggregateRules == null) {
return;
}
try {
for (AggregateRule aggregateRule : aggregateRules) {
NodeState root = aggregateRule.getAggregateRoot(state);
if (root != null) {
map.put(root.getNodeId(), root);
}
}
} catch (Exception e) {
log.warn("Unable to get aggregate root for "
+ state.getNodeId(), e);
}
}
}
/**
* Retrieves the root of the indexing aggregate for <code>removedIds</code>
* and puts it into <code>map</code>.
*
* @param removedIds the ids of removed nodes.
* @param map aggregate roots are collected in this map
*/
protected void retrieveAggregateRoot(
Set<NodeId> removedIds, Map<NodeId, NodeState> map) {
if (indexingConfig != null) {
AggregateRule[] aggregateRules = indexingConfig.getAggregateRules();
if (aggregateRules == null) {
return;
}
int found = 0;
long time = System.currentTimeMillis();
try {
CachingMultiIndexReader reader = index.getIndexReader();
try {
Term aggregateIds =
new Term(FieldNames.AGGREGATED_NODE_UUID, "");
TermDocs tDocs = reader.termDocs();
try {
ItemStateManager ism = getContext().getItemStateManager();
for (NodeId id : removedIds) {
aggregateIds =
aggregateIds.createTerm(id.toString());
tDocs.seek(aggregateIds);
while (tDocs.next()) {
Document doc = reader.document(
tDocs.doc(), FieldSelectors.UUID);
NodeId nId = new NodeId(doc.get(FieldNames.UUID));
map.put(nId, (NodeState) ism.getItemState(nId));
found++;
}
}
} finally {
tDocs.close();
}
} finally {
reader.release();
}
} catch (Exception e) {
log.warn("Exception while retrieving aggregate roots", e);
}
time = System.currentTimeMillis() - time;
log.debug("Retrieved {} aggregate roots in {} ms.", found, time);
}
}
//----------------------------< internal >----------------------------------
/**
* Combines multiple {@link CachingMultiIndexReader} into a <code>MultiReader</code>
* with {@link HierarchyResolver} support.
*/
protected static final class CombinedIndexReader
extends MultiReader
implements HierarchyResolver, MultiIndexReader {
/**
* The sub readers.
*/
private final CachingMultiIndexReader[] subReaders;
/**
* Doc number starts for each sub reader
*/
private int[] starts;
public CombinedIndexReader(CachingMultiIndexReader[] indexReaders) {
super(indexReaders);
this.subReaders = indexReaders;
this.starts = new int[subReaders.length + 1];
int maxDoc = 0;
for (int i = 0; i < subReaders.length; i++) {
starts[i] = maxDoc;
maxDoc += subReaders[i].maxDoc();
}
starts[subReaders.length] = maxDoc;
}
/**
* @inheritDoc
*/
public int[] getParents(int n, int[] docNumbers) throws IOException {
int i = readerIndex(n);
DocId id = subReaders[i].getParentDocId(n - starts[i]);
id = id.applyOffset(starts[i]);
return id.getDocumentNumbers(this, docNumbers);
}
//-------------------------< MultiIndexReader >-------------------------
/**
* {@inheritDoc}
*/
public IndexReader[] getIndexReaders() {
IndexReader[] readers = new IndexReader[subReaders.length];
System.arraycopy(subReaders, 0, readers, 0, subReaders.length);
return readers;
}
/**
* {@inheritDoc}
*/
public void release() throws IOException {
for (CachingMultiIndexReader subReader : subReaders) {
subReader.release();
}
}
//---------------------------< internal >-------------------------------
/**
* Returns the reader index for document <code>n</code>.
* Implementation copied from lucene MultiReader class.
*
* @param n document number.
* @return the reader index.
*/
private int readerIndex(int n) {
int lo = 0; // search starts array
int hi = subReaders.length - 1; // for first element less
while (hi >= lo) {
int mid = (lo + hi) >> 1;
int midValue = starts[mid];
if (n < midValue) {
hi = mid - 1;
} else if (n > midValue) {
lo = mid + 1;
} else { // found a match
while (mid + 1 < subReaders.length && starts[mid + 1] == midValue) {
mid++; // scan to last match
}
return mid;
}
}
return hi;
}
public boolean equals(Object obj) {
if (obj instanceof CombinedIndexReader) {
CombinedIndexReader other = (CombinedIndexReader) obj;
return Arrays.equals(subReaders, other.subReaders);
}
return false;
}
public int hashCode() {
int hash = 0;
for (CachingMultiIndexReader subReader : subReaders) {
hash = 31 * hash + subReader.hashCode();
}
return hash;
}
/**
* {@inheritDoc}
*/
public ForeignSegmentDocId createDocId(NodeId id) throws IOException {
for (CachingMultiIndexReader subReader : subReaders) {
ForeignSegmentDocId doc = subReader.createDocId(id);
if (doc != null) {
return doc;
}
}
return null;
}
/**
* {@inheritDoc}
*/
public int getDocumentNumber(ForeignSegmentDocId docId) {
for (int i = 0; i < subReaders.length; i++) {
CachingMultiIndexReader subReader = subReaders[i];
int realDoc = subReader.getDocumentNumber(docId);
if (realDoc >= 0) {
return realDoc + starts[i];
}
}
return -1;
}
}
//--------------------------< properties >----------------------------------
/**
* Sets the analyzer in use for indexing. The given analyzer class name
* must satisfy the following conditions:
* <ul>
* <li>the class must exist in the class path</li>
* <li>the class must have a public default constructor</li>
* <li>the class must be a Lucene Analyzer</li>
* </ul>
* <p>
* If the above conditions are met, then a new instance of the class is
* set as the analyzer. Otherwise a warning is logged and the current
* analyzer is not changed.
* <p>
* This property setter method is normally invoked by the Jackrabbit
* configuration mechanism if the "analyzer" parameter is set in the
* search configuration.
*
* @param analyzerClassName the analyzer class name
*/
public void setAnalyzer(String analyzerClassName) {
try {
Class<?> analyzerClass = Class.forName(analyzerClassName);
analyzer.setDefaultAnalyzer((Analyzer) analyzerClass.newInstance());
} catch (Exception e) {
log.warn("Invalid Analyzer class: " + analyzerClassName, e);
}
}
/**
* Returns the class name of the analyzer that is currently in use.
*
* @return class name of analyzer in use.
*/
public String getAnalyzer() {
return analyzer.getClass().getName();
}
/**
* Sets the location of the search index.
*
* @param path the location of the search index.
*/
public void setPath(String path) {
this.path = path;
}
/**
* Returns the location of the search index. Returns <code>null</code> if
* not set.
*
* @return the location of the search index.
*/
public String getPath() {
return path;
}
/**
* The lucene index writer property: useCompoundFile
*/
public void setUseCompoundFile(boolean b) {
useCompoundFile = b;
}
/**
* Returns the current value for useCompoundFile.
*
* @return the current value for useCompoundFile.
*/
public boolean getUseCompoundFile() {
return useCompoundFile;
}
/**
* The lucene index writer property: minMergeDocs
*/
public void setMinMergeDocs(int minMergeDocs) {
this.minMergeDocs = minMergeDocs;
}
/**
* Returns the current value for minMergeDocs.
*
* @return the current value for minMergeDocs.
*/
public int getMinMergeDocs() {
return minMergeDocs;
}
/**
* Sets the property: volatileIdleTime
*
* @param volatileIdleTime idle time in seconds
*/
public void setVolatileIdleTime(int volatileIdleTime) {
this.volatileIdleTime = volatileIdleTime;
}
/**
* Returns the current value for volatileIdleTime.
*
* @return the current value for volatileIdleTime.
*/
public int getVolatileIdleTime() {
return volatileIdleTime;
}
/**
* The lucene index writer property: maxMergeDocs
*/
public void setMaxMergeDocs(int maxMergeDocs) {
this.maxMergeDocs = maxMergeDocs;
}
/**
* Returns the current value for maxMergeDocs.
*
* @return the current value for maxMergeDocs.
*/
public int getMaxMergeDocs() {
return maxMergeDocs;
}
/**
* The lucene index writer property: mergeFactor
*/
public void setMergeFactor(int mergeFactor) {
this.mergeFactor = mergeFactor;
}
/**
* Returns the current value for the merge factor.
*
* @return the current value for the merge factor.
*/
public int getMergeFactor() {
return mergeFactor;
}
/**
* @see VolatileIndex#setBufferSize(int)
*/
public void setBufferSize(int size) {
bufferSize = size;
}
/**
* Returns the current value for the buffer size.
*
* @return the current value for the buffer size.
*/
public int getBufferSize() {
return bufferSize;
}
public void setRespectDocumentOrder(boolean docOrder) {
documentOrder = docOrder;
}
public boolean getRespectDocumentOrder() {
return documentOrder;
}
public void setForceConsistencyCheck(boolean b) {
forceConsistencyCheck = b;
}
public boolean getForceConsistencyCheck() {
return forceConsistencyCheck;
}
public void setAutoRepair(boolean b) {
autoRepair = b;
}
public boolean getAutoRepair() {
return autoRepair;
}
public void setCacheSize(int size) {
cacheSize = size;
}
public int getCacheSize() {
return cacheSize;
}
public void setMaxFieldLength(int length) {
maxFieldLength = length;
}
public int getMaxFieldLength() {
return maxFieldLength;
}
public void setMaxExtractLength(int length) {
maxExtractLength = length;
}
public int getMaxExtractLength() {
if (maxExtractLength < 0) {
return -maxExtractLength * maxFieldLength;
} else {
return maxExtractLength;
}
}
/**
* Sets the list of text extractors (and text filters) to use for
* extracting text content from binary properties. The list must be
* comma (or whitespace) separated, and contain fully qualified class
* names of the {@link TextExtractor} (and {@link org.apache.jackrabbit.core.query.TextFilter}) classes
* to be used. The configured classes must all have a public default
* constructor.
*
* @param filterClasses comma separated list of class names
* @deprecated
*/
public void setTextFilterClasses(String filterClasses) {
parser.setTextFilterClasses(filterClasses);
}
/**
* Returns the fully qualified class names of the text filter instances
* currently in use. The names are comma separated.
*
* @return class names of the text filters in use.
* @deprecated
*/
public String getTextFilterClasses() {
return "deprectated";
}
/**
* Tells the query handler how many result should be fetched initially when
* a query is executed.
*
* @param size the number of results to fetch initially.
*/
public void setResultFetchSize(int size) {
resultFetchSize = size;
}
/**
* @return the number of results the query handler will fetch initially when
* a query is executed.
*/
public int getResultFetchSize() {
return resultFetchSize;
}
/**
* The number of background threads for the extractor pool.
*
* @param numThreads the number of threads.
*/
public void setExtractorPoolSize(int numThreads) {
if (numThreads < 0) {
numThreads = 0;
}
extractorPoolSize = numThreads;
}
/**
* @return the size of the thread pool which is used to run the text
* extractors when binary content is indexed.
*/
public int getExtractorPoolSize() {
return extractorPoolSize;
}
/**
* The number of extractor jobs that are queued until a new job is executed
* with the current thread instead of using the thread pool.
*
* @param backLog size of the extractor job queue.
*/
public void setExtractorBackLogSize(int backLog) {
extractorBackLog = backLog;
}
/**
* @return the size of the extractor queue back log.
*/
public int getExtractorBackLogSize() {
return extractorBackLog;
}
/**
* The timeout in milliseconds which is granted to the text extraction
* process until fulltext indexing is deferred to a background thread.
*
* @param timeout the timeout in milliseconds.
*/
public void setExtractorTimeout(long timeout) {
extractorTimeout = timeout;
}
/**
* @return the extractor timeout in milliseconds.
*/
public long getExtractorTimeout() {
return extractorTimeout;
}
/**
* If set to <code>true</code> additional information is stored in the index
* to support highlighting using the rep:excerpt pseudo property.
*
* @param b <code>true</code> to enable highlighting support.
*/
public void setSupportHighlighting(boolean b) {
supportHighlighting = b;
}
/**
* @return <code>true</code> if highlighting support is enabled.
*/
public boolean getSupportHighlighting() {
return supportHighlighting;
}
/**
* Sets the class name for the {@link ExcerptProvider} that should be used
* for the rep:excerpt pseudo property in a query.
*
* @param className the name of a class that implements {@link
* ExcerptProvider}.
*/
public void setExcerptProviderClass(String className) {
try {
Class<?> clazz = Class.forName(className);
if (ExcerptProvider.class.isAssignableFrom(clazz)) {
excerptProviderClass = clazz;
} else {
log.warn("Invalid value for excerptProviderClass, {} does "
+ "not implement ExcerptProvider interface.", className);
}
} catch (ClassNotFoundException e) {
log.warn("Invalid value for excerptProviderClass, class {} not found.",
className);
}
}
/**
* @return the class name of the excerpt provider implementation.
*/
public String getExcerptProviderClass() {
return excerptProviderClass.getName();
}
/**
* Sets the path to the indexing configuration file.
*
* @param path the path to the configuration file.
*/
public void setIndexingConfiguration(String path) {
indexingConfigPath = path;
}
/**
* @return the path to the indexing configuration file.
*/
public String getIndexingConfiguration() {
return indexingConfigPath;
}
/**
* Sets the name of the class that implements {@link IndexingConfiguration}.
* The default value is <code>org.apache.jackrabbit.core.query.lucene.IndexingConfigurationImpl</code>.
*
* @param className the name of the class that implements {@link
* IndexingConfiguration}.
*/
public void setIndexingConfigurationClass(String className) {
try {
Class<?> clazz = Class.forName(className);
if (IndexingConfiguration.class.isAssignableFrom(clazz)) {
indexingConfigurationClass = clazz;
} else {
log.warn("Invalid value for indexingConfigurationClass, {} "
+ "does not implement IndexingConfiguration interface.",
className);
}
} catch (ClassNotFoundException e) {
log.warn("Invalid value for indexingConfigurationClass, class {} not found.",
className);
}
}
/**
* @return the class name of the indexing configuration implementation.
*/
public String getIndexingConfigurationClass() {
return indexingConfigurationClass.getName();
}
/**
* Sets the name of the class that implements {@link SynonymProvider}. The
* default value is <code>null</code> (none set).
*
* @param className name of the class that implements {@link
* SynonymProvider}.
*/
public void setSynonymProviderClass(String className) {
try {
Class<?> clazz = Class.forName(className);
if (SynonymProvider.class.isAssignableFrom(clazz)) {
synonymProviderClass = clazz;
} else {
log.warn("Invalid value for synonymProviderClass, {} "
+ "does not implement SynonymProvider interface.",
className);
}
} catch (ClassNotFoundException e) {
log.warn("Invalid value for synonymProviderClass, class {} not found.",
className);
}
}
/**
* @return the class name of the synonym provider implementation or
* <code>null</code> if none is set.
*/
public String getSynonymProviderClass() {
if (synonymProviderClass != null) {
return synonymProviderClass.getName();
} else {
return null;
}
}
/**
* Sets the name of the class that implements {@link SpellChecker}. The
* default value is <code>null</code> (none set).
*
* @param className name of the class that implements {@link SpellChecker}.
*/
public void setSpellCheckerClass(String className) {
try {
Class<?> clazz = Class.forName(className);
if (SpellChecker.class.isAssignableFrom(clazz)) {
spellCheckerClass = clazz;
} else {
log.warn("Invalid value for spellCheckerClass, {} "
+ "does not implement SpellChecker interface.",
className);
}
} catch (ClassNotFoundException e) {
log.warn("Invalid value for spellCheckerClass,"
+ " class {} not found.", className);
}
}
/**
* @return the class name of the spell checker implementation or
* <code>null</code> if none is set.
*/
public String getSpellCheckerClass() {
if (spellCheckerClass != null) {
return spellCheckerClass.getName();
} else {
return null;
}
}
/**
* Enables or disables the consistency check on startup. Consistency checks
* are disabled per default.
*
* @param b <code>true</code> enables consistency checks.
* @see #setForceConsistencyCheck(boolean)
*/
public void setEnableConsistencyCheck(boolean b) {
this.consistencyCheckEnabled = b;
}
/**
* @return <code>true</code> if consistency checks are enabled.
*/
public boolean getEnableConsistencyCheck() {
return consistencyCheckEnabled;
}
/**
* Sets the configuration path for the synonym provider.
*
* @param path the configuration path for the synonym provider.
*/
public void setSynonymProviderConfigPath(String path) {
synonymProviderConfigPath = path;
}
/**
* @return the configuration path for the synonym provider. If none is set
* this method returns <code>null</code>.
*/
public String getSynonymProviderConfigPath() {
return synonymProviderConfigPath;
}
/**
* Sets the similarity implementation, which will be used for indexing and
* searching. The implementation must extend {@link Similarity}.
*
* @param className a {@link Similarity} implementation.
*/
public void setSimilarityClass(String className) {
try {
Class<?> similarityClass = Class.forName(className);
similarity = (Similarity) similarityClass.newInstance();
} catch (Exception e) {
log.warn("Invalid Similarity class: " + className, e);
}
}
/**
* @return the name of the similarity class.
*/
public String getSimilarityClass() {
return similarity.getClass().getName();
}
/**
* Sets a new maxVolatileIndexSize value.
*
* @param maxVolatileIndexSize the new value.
*/
public void setMaxVolatileIndexSize(long maxVolatileIndexSize) {
this.maxVolatileIndexSize = maxVolatileIndexSize;
}
/**
* @return the maxVolatileIndexSize in bytes.
*/
public long getMaxVolatileIndexSize() {
return maxVolatileIndexSize;
}
/**
* @return the name of the directory manager class.
*/
public String getDirectoryManagerClass() {
return directoryManagerClass;
}
/**
* Sets name of the directory manager class. The class must implement
* {@link DirectoryManager}.
*
* @param className the name of the class that implements directory manager.
*/
public void setDirectoryManagerClass(String className) {
this.directoryManagerClass = className;
}
/**
* @return the current value for termInfosIndexDivisor.
*/
public int getTermInfosIndexDivisor() {
return termInfosIndexDivisor;
}
/**
* Sets a new value for termInfosIndexDivisor.
*
* @param termInfosIndexDivisor the new value.
*/
public void setTermInfosIndexDivisor(int termInfosIndexDivisor) {
this.termInfosIndexDivisor = termInfosIndexDivisor;
}
/**
* @return <code>true</code> if the hierarchy cache should be initialized
* immediately on startup.
*/
public boolean isInitializeHierarchyCache() {
return initializeHierarchyCache;
}
/**
* Whether the hierarchy cache should be initialized immediately on
* startup.
*
* @param initializeHierarchyCache <code>true</code> if the cache should be
* initialized immediately.
*/
public void setInitializeHierarchyCache(boolean initializeHierarchyCache) {
this.initializeHierarchyCache = initializeHierarchyCache;
}
/**
* @return the maximum age in seconds for outdated generations of
* {@link IndexInfos}.
*/
public long getMaxHistoryAge() {
return maxHistoryAge;
}
/**
* Sets a new value for the maximum age in seconds for outdated generations
* of {@link IndexInfos}.
*
* @param maxHistoryAge age in seconds.
*/
public void setMaxHistoryAge(long maxHistoryAge) {
this.maxHistoryAge = maxHistoryAge;
}
/**
* @return the name of the redo log factory class.
*/
public String getRedoLogFactoryClass() {
return redoLogFactoryClass;
}
/**
* Sets the name of the redo log factory class. Must implement
* {@link RedoLogFactory}.
*
* @param className the name of the redo log factory class.
*/
public void setRedoLogFactoryClass(String className) {
this.redoLogFactoryClass = className;
}
//----------------------------< internal >----------------------------------
/**
* Checks if this <code>SearchIndex</code> is open, otherwise throws
* an <code>IOException</code>.
*
* @throws IOException if this <code>SearchIndex</code> had been closed.
*/
protected void checkOpen() throws IOException {
if (closed) {
throw new IOException("query handler closed and cannot be used anymore.");
}
}
}
SearchIndex类的源码实在过长，其实是里面大部分均为与lucene索引与检索的相关参数及执行环境等
先看它的初始化方法（有抽象父类构造方法调用）
/**
* Initializes this <code>QueryHandler</code>. This implementation requires
* that a path parameter is set in the configuration. If this condition
* is not met, a <code>IOException</code> is thrown.
*
* @throws IOException if an error occurs while initializing this handler.
*/
protected void doInit() throws IOException {
QueryHandlerContext context = getContext();
if (path == null) {
throw new IOException("SearchIndex requires 'path' parameter in configuration!");
}
Set<NodeId> excludedIDs = new HashSet<NodeId>();
if (context.getExcludedNodeId() != null) {
excludedIDs.add(context.getExcludedNodeId());
}
synProvider = createSynonymProvider();
directoryManager = createDirectoryManager();
redoLogFactory = createRedoLogFactory();
if (context.getParentHandler() instanceof SearchIndex) {
// use system namespace mappings
SearchIndex sysIndex = (SearchIndex) context.getParentHandler();
nsMappings = sysIndex.getNamespaceMappings();
} else {
// read local namespace mappings
File mapFile = new File(new File(path), NS_MAPPING_FILE);
if (mapFile.exists()) {
// be backward compatible and use ns_mappings.properties from
// index folder
nsMappings = new FileBasedNamespaceMappings(mapFile);
} else {
// otherwise use repository wide stable index prefix from
// namespace registry
nsMappings = new NSRegistryBasedNamespaceMappings(
context.getNamespaceRegistry());
}
}
scs = new SharedFieldSortComparator(
FieldNames.PROPERTIES, context.getItemStateManager(),
context.getHierarchyManager(), nsMappings);
indexingConfig = createIndexingConfiguration(nsMappings);
analyzer.setIndexingConfig(indexingConfig);
index = new MultiIndex(this, excludedIDs);
if (index.numDocs() == 0) {
Path rootPath;
if (excludedIDs.isEmpty()) {
// this is the index for jcr:system
rootPath = JCR_SYSTEM_PATH;
} else {
rootPath = ROOT_PATH;
}
index.createInitialIndex(context.getItemStateManager(),
context.getRootId(), rootPath);
}
if (consistencyCheckEnabled
&& (index.getRedoLogApplied() || forceConsistencyCheck)) {
log.info("Running consistency check...");
try {
ConsistencyCheck check = runConsistencyCheck();
if (autoRepair) {
check.repair(true);
} else {
List<ConsistencyCheckError> errors = check.getErrors();
if (errors.size() == 0) {
log.info("No errors detected.");
}
for (ConsistencyCheckError err : errors) {
log.info(err.toString());
}
}
} catch (Exception e) {
log.warn("Failed to run consistency check on index: " + e);
}
}
// initialize spell checker
spellChecker = createSpellChecker();
log.info("Index initialized: {} Version: {}",
new Object[]{path, index.getIndexFormatVersion()});
if (!index.getIndexFormatVersion().equals(getIndexFormatVersion())) {
log.warn("Using Version {} for reading. Please re-index version " +
"storage for optimal performance.",
getIndexFormatVersion().getVersion());
}
}
主要是初始化必要的成员变量，如lucene的路径，索引执行类，分词器，解析器，日志类等
它的索引操作方法如下：
/**
* This implementation forwards the call to
* {@link MultiIndex#update(Collection, Collection)} and
* transforms the two iterators to the required types.
*
* @param remove ids of nodes to remove.
* @param add NodeStates to add. Calls to <code>next()</code> on this
* iterator may return <code>null</code>, to indicate that a
* node could not be indexed successfully.
* @throws RepositoryException if an error occurs while indexing a node.
* @throws IOException if an error occurs while updating the index.
*/
public void updateNodes(Iterator<NodeId> remove, Iterator<NodeState> add)
throws RepositoryException, IOException {
checkOpen();
Map<NodeId, NodeState> aggregateRoots = new HashMap<NodeId, NodeState>();
Set<NodeId> removedIds = new HashSet<NodeId>();
Set<NodeId> addedIds = new HashSet<NodeId>();
Collection<NodeId> removeCollection = new ArrayList<NodeId>();
while (remove.hasNext()) {
NodeId id = remove.next();
removeCollection.add(id);
removedIds.add(id);
}
Collection<Document> addCollection = new ArrayList<Document>();
while (add.hasNext()) {
NodeState state = add.next();
if (state != null) {
NodeId id = state.getNodeId();
addedIds.add(id);
removedIds.remove(id);
retrieveAggregateRoot(state, aggregateRoots);
try {
addCollection.add(createDocument(
state, getNamespaceMappings(),
index.getIndexFormatVersion()));
} catch (RepositoryException e) {
log.warn("Exception while creating document for node: "
+ state.getNodeId() + ": " + e.toString());
}
}
}
index.update(removeCollection, addCollection);
// remove any aggregateRoot nodes that are new
// and therefore already up-to-date
aggregateRoots.keySet().removeAll(addedIds);
// based on removed ids get affected aggregate root nodes
retrieveAggregateRoot(removedIds, aggregateRoots);
// update aggregates if there are any affected
if (!aggregateRoots.isEmpty()) {
Collection<Document> modified =
new ArrayList<Document>(aggregateRoots.size());
for (NodeState state : aggregateRoots.values()) {
try {
modified.add(createDocument(
state, getNamespaceMappings(),
index.getIndexFormatVersion()));
} catch (RepositoryException e) {
log.warn("Exception while creating document for node: "
+ state.getNodeId(), e);
}
}
index.update(aggregateRoots.keySet(), modified);
}
}
这里实现的主要是删除索引和添加索引,最后调用index的update方法（MultiIndex类型的index）
添加索引部分调用了自身的createDocument方法创建Document
/**
* Creates a lucene <code>Document</code> for a node state using the
* namespace mappings <code>nsMappings</code>.
*
* @param node the node state to index.
* @param nsMappings the namespace mappings of the search index.
* @param indexFormatVersion the index format version that should be used to
* index the passed node state.
* @return a lucene <code>Document</code> that contains all properties of
* <code>node</code>.
* @throws RepositoryException if an error occurs while indexing the
* <code>node</code>.
*/
protected Document createDocument(NodeState node,
NamespaceMappings nsMappings,
IndexFormatVersion indexFormatVersion)
throws RepositoryException {
NodeIndexer indexer = new NodeIndexer(
node, getContext().getItemStateManager(), nsMappings,
getContext().getExecutor(), parser);
indexer.setSupportHighlighting(supportHighlighting);
indexer.setIndexingConfiguration(indexingConfig);
indexer.setIndexFormatVersion(indexFormatVersion);
indexer.setMaxExtractLength(getMaxExtractLength());
Document doc = indexer.createDoc();
mergeAggregatedNodeIndexes(node, doc, indexFormatVersion);
return doc;
}
这里显然是调用NodeIndexer类来创建Document的，上文已经涉及了
其次是lucene的检索方法
/**
* Creates a new query by specifying the query statement itself and the
* language in which the query is stated. If the query statement is
* syntactically invalid, given the language specified, an
* InvalidQueryException is thrown. <code>language</code> must specify a query language
* string from among those returned by QueryManager.getSupportedQueryLanguages(); if it is not
* then an <code>InvalidQueryException</code> is thrown.
*
* @param sessionContext component context of the current session
* @param statement the query statement.
* @param language the syntax of the query statement.
* @throws InvalidQueryException if statement is invalid or language is unsupported.
* @return A <code>Query</code> object.
*/
public ExecutableQuery createExecutableQuery(
SessionContext sessionContext, String statement, String language)
throws InvalidQueryException {
QueryImpl query = new QueryImpl(
sessionContext, this, getContext().getPropertyTypeRegistry(),
statement, language, getQueryNodeFactory());
query.setRespectDocumentOrder(documentOrder);
return query;
}
这里是通过封装org.apache.jackrabbit.core.query.lucene.QueryImpl类来实现lucene的检索功能的，等后文再分析吧
SearchIndex类的其他功能方法尚待发掘中，本文到此打住吧
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