com.twitter.chill.java.UnmodifiableMapSerializer Maven / Gradle / Ivy
/*
* Copyright 2016 Alex Chermenin
*
* 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.twitter.chill.java;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import com.twitter.chill.IKryoRegistrar;
import com.twitter.chill.SingleRegistrar;
import java.lang.reflect.Field;
import java.util.*;
/**
* A kryo {@link Serializer} for unmodifiable maps created via {@link Collections#unmodifiableMap(Map)}.
*
* Note: This serializer does not support cyclic references, so if one of the objects
* gets set the list as attribute this might cause an error during deserialization.
*
*
* @author Alex Chermenin
*/
public class UnmodifiableMapSerializer extends UnmodifiableJavaCollectionSerializer> {
@SuppressWarnings("unchecked")
static public IKryoRegistrar registrar() {
return new SingleRegistrar(Collections.unmodifiableMap(Collections.EMPTY_MAP).getClass(),
new UnmodifiableMapSerializer());
}
@Override
protected Field getInnerField() throws Exception {
return Class.forName("java.util.Collections$UnmodifiableMap").getDeclaredField("m");
}
@Override
protected Map newInstance(Map m) {
return Collections.unmodifiableMap(m);
}
}