60 lines
2.0 KiB
Java
60 lines
2.0 KiB
Java
/*
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* Copyright 2010 Martin Grotzke
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package dorkbox.serializers;
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import java.util.Collections;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import com.esotericsoftware.kryo.Kryo;
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import com.esotericsoftware.kryo.Serializer;
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import com.esotericsoftware.kryo.io.Input;
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import com.esotericsoftware.kryo.io.Output;
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/**
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* A kryo {@link Serializer} for {@link List}s created via {@link Collections#singletonMap(Object, Object)}.
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* <p>
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* Note: This serializer does not support cyclic references, if a serialized object
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* is part of a cycle this might cause an error during deserialization.
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* </p>
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*
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* @author <a href="mailto:martin.grotzke@javakaffee.de">Martin Grotzke</a>
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*/
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public class CollectionsSingletonMapSerializer extends Serializer<Map<?, ?>> {
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public CollectionsSingletonMapSerializer() {
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setImmutable(true);
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}
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@Override
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public Map<?, ?> read(final Kryo kryo, final Input input, final Class<? extends Map<?, ?>> type) {
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final Object key = kryo.readClassAndObject( input );
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final Object value = kryo.readClassAndObject( input );
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return Collections.singletonMap( key, value );
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}
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@Override
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public void write(final Kryo kryo, final Output output, final Map<?, ?> map) {
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final Entry<?, ?> entry = map.entrySet().iterator().next();
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kryo.writeClassAndObject( output, entry.getKey() );
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kryo.writeClassAndObject( output, entry.getValue() );
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}
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}
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