com.alibaba.nacos.naming.selector.SelectorJsonAdapter Maven / Gradle / Ivy
/*
* Copyright 1999-2018 Alibaba Group Holding Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.nacos.naming.selector;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.parser.DefaultJSONParser;
import com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;
import com.alibaba.fastjson.serializer.JSONSerializer;
import com.alibaba.fastjson.serializer.ObjectSerializer;
import com.alibaba.fastjson.serializer.SerializeWriter;
import com.alibaba.nacos.api.selector.SelectorType;
import org.apache.commons.lang3.StringUtils;
import java.io.IOException;
import java.lang.reflect.Type;
/**
* Json adapter for class Selector.
*
* When deserializing object for class Selector, we should consider to convert the selector to
* its runtime child class object. And this adapter helps us to finish it.
*
* @author nkorange
*/
public class SelectorJsonAdapter implements ObjectDeserializer, ObjectSerializer {
private static SelectorJsonAdapter INSTANCE = new SelectorJsonAdapter();
private SelectorJsonAdapter() {
}
public static SelectorJsonAdapter getInstance() {
return INSTANCE;
}
@Override
public T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
JSONObject jsonObj = (JSONObject) parser.parse();
if (jsonObj == null) {
return null;
}
String checkType = jsonObj.getString("type");
if (StringUtils.equals(checkType, SelectorType.label.name())) {
return (T) JSON.parseObject(jsonObj.toJSONString(), LabelSelector.class);
}
if (StringUtils.equals(checkType, SelectorType.none.name())) {
return (T) JSON.parseObject(jsonObj.toJSONString(), NoneSelector.class);
}
return null;
}
@Override
public int getFastMatchToken() {
return 0;
}
@Override
public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType, int features) throws IOException {
SerializeWriter writer = serializer.getWriter();
if (object == null) {
writer.writeNull();
return;
}
Selector selector = (Selector) object;
writer.writeFieldValue(',', "type", selector.getType());
if (StringUtils.equals(selector.getType(), SelectorType.label.name())) {
LabelSelector labelSelector = (LabelSelector) selector;
writer.writeFieldValue(',', "labels", JSON.toJSONString(labelSelector.getLabels()));
}
}
}