package org.sunney.help.util;



import java.util.HashMap;

import java.util.List;

import java.util.Map;



import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.serializer.JSONSerializer;

import com.alibaba.fastjson.serializer.PropertyFilter;

import com.alibaba.fastjson.serializer.SerializeWriter;



/**

 * @author fisher

 * @description json工具包

 * @date 2011-8-9

 */

public class JsonUtil {

	private static final Log log = LogFactory.getLog(JsonUtil.class);



	/**

	 * @description 将java对象序列化为json字符串

	 * @param Object

	 * @return String

	 */



	public static final String serialize(Object o) {

		try {

			String jsonStr = JSON.toJSONString(o);

			log.debug("The jsonstr is:" + jsonStr);

			return jsonStr;

		} catch (Exception e) {

			log.debug("Serialize java obejct to jsonStr error!,caused by:", e);

			return null;

		}



	}

	

	/**

	 * @description 自定义序列化,当isInclude为true,序列化后的字符串

	 * 				只包含propertyFilter中与对象所对应的属性名,反之,

	 * 				则排除propertyFileter中得属性名

	 * 例如： User u=new User();

	 * 		 u.setName('hhh');

	 * 		 u.setId('123');

	 * 		 serialize(u,new String[]{'name'},true);

	 * 结果为:

	 * 		{"name":"hhh"}

	 * @param Object o 

	 * @param propertyFilter 属性过滤器

	 * @param isInclude 是否包含filter中得属性

	 * @return

	 */

	

	public final static String serialize(Object o, final String[] propertyFilter,

			final boolean isInclude) {

		try {

			PropertyFilter filter = new PropertyFilter() {

				public boolean apply(Object source, String name, Object value) {

					for (String property : propertyFilter) {

						if(name.equals(property)){

							return isInclude;

						}

					}

					return !isInclude;

				}

			};

			SerializeWriter out = new SerializeWriter();

			JSONSerializer serializer = new JSONSerializer(out);

			serializer.getPropertyFilters().add(filter);

			serializer.write(o);

			String jsonStr=out.toString();

			log.debug("The jsonstr is:" + jsonStr);

			return jsonStr;

		} catch (Exception e) {

			log.debug("Serialize java obejct to jsonStr error!,caused by:", e);

			return null;

		}



	}



	/**

	 * @description 将json字符串反序列化成java对象

	 * @param jsonStr

	 * @param clazz

	 * @return Object

	 */



	public static final <T> Object deserialize(String jsonStr, Class<T> clazz) {

		try {

			return JSON.parseObject(jsonStr, clazz);

		} catch (Exception e) {

			log.debug("Deserialize jsonStr to Object error!,caused by:", e);

			return null;

		}

	}



	/**

	 * @description 将JSON字符串反序列化成List数组

	 * @param jsonStr

	 * @param clazz

	 * @return List

	 */



	public static final <T> List<T> parseArray(String jsonStr, Class<T> clazz) {

		try {

			return JSON.parseArray(jsonStr, clazz);

		} catch (Exception e) {

			log.debug("Deserialize jsonStr to Object error!,caused by:", e);

			return null;

		}



	}



}