TreeMapTypeAdapterFactory.java
/*
* Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you 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 org.apache.synapse.commons.emulator;
import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;
import java.io.IOException;
import java.util.Map;
import java.util.TreeMap;
/**
* Class responsible for holding the JSON data as a tree-map.
*/
public class TreeMapTypeAdapterFactory implements TypeAdapterFactory {
public final <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
if (Map.class.isAssignableFrom(type.getRawType())) {
final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
return createCustomTypeAdapter(delegate);
}
return null;
}
private <T> TypeAdapter<T> createCustomTypeAdapter(final TypeAdapter<T> delegate) {
return new TypeAdapter<T>() {
@Override
public void write(JsonWriter out, T value) throws IOException {
Map map = (Map) value;
delegate.write(out, (T) new TreeMap(map));
}
@Override
public T read(JsonReader in) throws IOException {
return delegate.read(in);
}
};
}
}