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package gu.simplemq.json;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import gu.simplemq.SimpleLog;
import gu.simplemq.exceptions.SmqNotBeanException;
import gu.simplemq.utils.SPIUtils;

/**
 * JSON实现对象序列化反序列化的抽象类
 * @author guyadong
 *
 */
public abstract class BaseJsonEncoder {
	static{
		/**
		 * SPI(Service Provider Interface)机制加载所有 {@link FastJsonInitializer}实例并执行初始化
		 */
		for(Iterator itor = SPIUtils.serviceLoaderOf(FastJsonInitializer.class).iterator();itor.hasNext();){
			try{
				FastJsonInitializer initializer = itor.next();
				SimpleLog.log("FastJsonInitializer: " + initializer.getClass().getName());
				initializer.init();
			}catch (Exception e) {
				SimpleLog.log(e);
			}
		}
	}
	public BaseJsonEncoder() {
	}
	/**
	 * serializes model to Json
	 * @param obj
	 */
	public abstract String toJsonString(Object obj);
	
	/**
	 * 按字段(field)序列化为Map对象
	 * @param obj
	 * @throws SmqNotBeanException
	 */
	public abstract Map toJsonMap(Object obj)throws SmqNotBeanException;

	/**
	 * deserialize json into T
	 * @param json
	 * @param type
	 * @return instance of {@code type } or {@code null} if {@code json} is {@code null}
	 */
	public abstract  T fromJson(String json, Type type);
	
	/**
	 * deserialize json field map  into T
	 * @param fieldHash
	 * @param type
	 * @return instance of {@code type } or {@code null} if {@code fieldHash} is {@code null} or empty
	 * @throws SmqNotBeanException
	 */
	public abstract  T fromJson(Map fieldHash, Type type)throws SmqNotBeanException ;
	
	public T fromJson(String json, Class clazz) {		
		return fromJson(json,(Type)clazz);
	}
	
	public  T fromJson(Map fieldHash, Class clazz)throws SmqNotBeanException {
		return fromJson(fieldHash,(Type)clazz);
	}
	
	public Map fromJson(Map fieldHash,Map types){
		if(null == fieldHash) {
			return null;
		}
		LinkedHashMap fields = new LinkedHashMap();
		for(Entry entry:fieldHash.entrySet()){
			String field = entry.getKey();
			fields.put(field, this.fromJson(entry.getValue(), null == types ? null : types.get(field)));
		}
		return fields;
	}
	
	public List