package com.rh.util;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
* Created with IntelliJ IDEA. User: pandy Date: 13-7-6 Time: 下午5:26 To change
* this template use File | Settings | File Templates.
*/
public class JSONUtils {

private static ObjectMapper getObjectMapper() {
ObjectMapper mapper = new ObjectMapper();
return mapper;
}

public static String bean2str(Object obj) {
try {
ObjectMapper mapper = getObjectMapper();
StringWriter writer = new StringWriter();
JsonGenerator gen = new JsonFactory().createJsonGenerator(writer);
mapper.writeValue(gen, obj);
gen.close();
String json = writer.toString();
writer.close();
return json;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static Object str2bean(String json, Class<?> clazz) {
try {
ObjectMapper mapper = getObjectMapper();
Object domain = mapper.readValue(json, clazz);
return domain;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static Object str2list(String json, TypeReference valueTypeRef) {
try {
ObjectMapper mapper = getObjectMapper();
Object domain = mapper.readValue(json, valueTypeRef);
return domain;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static Object str2list(String json, Class<?> clazz) {
try {
ObjectMapper mapper = getObjectMapper();
JavaType type = mapper.getTypeFactory().constructCollectionType(ArrayList.class, clazz);

Object domain = mapper.readValue(json, type);
return domain;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

// new TypeReference<Map<String,Object>>() { }
public static Object str2map(String json, TypeReference valueTypeRef) {
try {
ObjectMapper mapper = getObjectMapper();
Object domain = mapper.readValue(json, valueTypeRef);
return domain;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static Map<String, Object> str2map(String json) {
try {
ObjectMapper mapper = getObjectMapper();
Map<String, Object> domain = mapper.readValue(json, new TypeReference<Map<String, Object>>() {
});
return domain;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static String list2JsonString(List l) {
StringWriter sw = new StringWriter();

try {
ObjectMapper mapper = getObjectMapper();
mapper.writeValue(sw, l);

} catch (Exception e) {
e.printStackTrace();
}

return sw.toString();
}

public static Object map2bean(Map map, Class<?> clazz) {

String json = map2str(map);

try {
ObjectMapper mapper = getObjectMapper();
Object domain = mapper.readValue(json, clazz);
return domain;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static String map2str(Map map) {
StringWriter sw = new StringWriter();

try {
ObjectMapper mapper = getObjectMapper();
mapper.writeValue(sw, map);

} catch (Exception e) {
e.printStackTrace();
}
return sw.toString();
}

public static Map bean2map(Object o){

String s = bean2str(o);
Map map = str2map(s);
return map;
}

}