gu.simplemq.json.FastjsonEncoder Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of simplemq-base Show documentation
There is a newer version: 2.3.17
package gu.simplemq.json;

import java.lang.reflect.Type;
import java.nio.ByteBuffer;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;

import gu.simplemq.exceptions.SmqNotBeanException;
import gu.simplemq.utils.TypeUtils;

/**
 * 
 * 基于fastjson实现{@link BaseJsonEncoder}
 * @author guyadong
 *
 */
public class FastjsonEncoder extends BaseJsonEncoder {
	private static final FastjsonEncoder INSTANCE = new FastjsonEncoder();
	public static final SerializerFeature[] DEFAULT_SERIALIZER_FEATURES = new SerializerFeature[]{SerializerFeature.WriteMapNullValue,SerializerFeature.WriteNonStringKeyAsString};
	private static SerializerFeature[] serializerFeatures = DEFAULT_SERIALIZER_FEATURES;
	static {
		// 增加对 ByteBuffer 序列化支持
		ParserConfig.global.putDeserializer(ByteBuffer.class, ByteBufferCodec.instance);
		SerializeConfig.globalInstance.put(ByteBuffer.wrap(new byte[]{}).getClass(), ByteBufferCodec.instance);
	}
	public static FastjsonEncoder getInstance(){
		return INSTANCE;
	}
	
	protected FastjsonEncoder() {}
	
	protected JSONObject doToJSONObject(Object bean){
		// 先序列化再解析成JSONObject对象
		return (JSONObject) JSON.parse(this.toJsonString(bean));
	}
	
	@Override
	public String toJsonString(Object obj) {
		// java对象序列化(输出 null 字段)
		return JSON.toJSONString(obj,serializerFeatures);
	}

	@Override
	public Map toJsonMap(Object bean)throws SmqNotBeanException {
		if(null ==bean ){
			return null;
		}
		if(!TypeUtils.isJavaBean(bean.getClass())){
			throw new SmqNotBeanException("invalid type,not a java bean object");
		}

		JSONObject jsonObject = doToJSONObject(bean);
		Map fields = new LinkedHashMap();
		for(Entry entry : jsonObject.entrySet()) {
			Object value = entry.getValue();
			fields.put(entry.getKey(), null == value ? null : this.toJsonString(value));
		}
		return fields;
	}	
	
	@SuppressWarnings("unchecked")
	@Override
	public T fromJson(String json, Type type) {		
		if(type instanceof Class){
			return JSON.parseObject(json, (Class)type);		
		}else{
			return JSON.parseObject(json, type);
		}
	}
	
	@Override
	public  T fromJson(Map fieldHash, Type type)throws SmqNotBeanException {
		if(!TypeUtils.isJavaBean(type)){
			throw new SmqNotBeanException("invalid type,not a java bean");
		}
		if(null == fieldHash || fieldHash.isEmpty()){
			return null;
		}
		Map fields = new LinkedHashMap(); 
		for(Entry entry:fieldHash.entrySet()){
			fields.put(entry.getKey(), JSON.parse(entry.getValue()));
		}
		return com.alibaba.fastjson.util.TypeUtils.cast(fields, type, null);
	}

	/**
	 * @return serializerFeature
	 */
	public static SerializerFeature[] getSerializerFeature() {
		return serializerFeatures;
	}

	/**
	 * @param serializerFeatures 要设置的 serializerFeature
	 */
	public static void setSerializerFeature(SerializerFeature[] serializerFeatures) {
		if(serializerFeatures != null){
			FastjsonEncoder.serializerFeatures = serializerFeatures;
		}else{
			FastjsonEncoder.serializerFeatures = new SerializerFeature[0];
		}
	}
}