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/*
* Copyright 2014 Open Networking Laboratory
*
* 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 org.onosproject.store.serializers;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import com.esotericsoftware.kryo.serializers.MapSerializer;
import com.google.common.collect.ImmutableMap;
/**
* Kryo Serializer for {@link ImmutableMap}.
*/
public class ImmutableMapSerializer extends Serializer<ImmutableMap<?, ?>> {
private final MapSerializer mapSerializer = new MapSerializer();
/**
* Creates {@link ImmutableMap} serializer instance.
*/
public ImmutableMapSerializer() {
// non-null, immutable
super(false, true);
}
@Override
public void write(Kryo kryo, Output output, ImmutableMap<?, ?> object) {
// wrapping with unmodifiableMap proxy
// to avoid Kryo from writing only the reference marker of this instance,
// which will be embedded right before this method call.
kryo.writeObject(output, Collections.unmodifiableMap(object), mapSerializer);
}
@Override
public ImmutableMap<?, ?> read(Kryo kryo, Input input,
Class<ImmutableMap<?, ?>> type) {
Map<?, ?> map = kryo.readObject(input, HashMap.class, mapSerializer);
return ImmutableMap.copyOf(map);
}
}
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