package org.jtester.json.decoder;
import java.util.Collection;
import java.util.Map;
import org.jtester.json.decoder.array.CollectionDecoder;
import org.jtester.json.decoder.object.MapDecoder;
import org.jtester.json.decoder.object.PoJoDecoder;
import org.jtester.json.decoder.single.FixedTypeDecoder;
import org.jtester.json.decoder.single.SpecTypeDecoder;
import org.jtester.json.helper.JSONObject;
/**
* json串解码器基类<br>
* 解码：从json字符串反序列为java对象<br>
* 加码：将java对象序列化为json字符串<br>
*
* @author darui.wudr
*
*/
@SuppressWarnings({ "rawtypes" })
public abstract class JSONDecoder<T> {
/**
* 构造decoder时声明的对象class类型
*/
protected final Class clazz;
/**
* 真正对象的class类型，等于clazz或者是其子类
*/
protected Class realTargetType;
protected JSONDecoder(Class clazz) {
this.clazz = clazz;
this.realTargetType = clazz;
}
/**
* 从json字符串反序列为java对象
*
* @param json
* @return
*/
public abstract T decode(JSONObject json, Map<String, Object> references);
public static JSONDecoder get(Class clazz) {
FixedTypeDecoder decoder = FixedTypeDecoder.isFinalDecoder(clazz);
if (decoder != null) {
return decoder;
}
SpecTypeDecoder specTypeDecoder = SpecTypeDecoder.isSpecTypeDecoder(clazz);
if (specTypeDecoder != null) {
return specTypeDecoder;
}
// 数组类型
if (clazz.isArray()) {
return ArrayDecoder.getObjectArrayDecoder(clazz.getComponentType());
}
// 集合类型
if (Collection.class.isAssignableFrom(clazz)) {
return new CollectionDecoder(clazz);
}
// Map类型
if (Map.class.isAssignableFrom(clazz) || clazz == Object.class) {
return new MapDecoder(clazz);
}
// 普通对象
return new PoJoDecoder(clazz);
}
}