gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/binary/types/MapEntrySerializer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.tinkerpop.gremlin.structure.io.binary.types;

import org.apache.tinkerpop.gremlin.structure.io.binary.GraphBinaryReader;
import org.apache.tinkerpop.gremlin.structure.io.binary.GraphBinaryWriter;
import org.apache.tinkerpop.gremlin.structure.io.Buffer;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class MapEntrySerializer extends SimpleTypeSerializer<Map.Entry> implements TransformSerializer<Map.Entry> {
    public MapEntrySerializer() {
        super(null);
    }

    @Override
    protected Map.Entry readValue(final Buffer buffer, final GraphBinaryReader context) throws IOException {
        throw new IOException("A map entry should not be read individually");
    }

    @Override
    protected void writeValue(final Map.Entry value, final Buffer buffer, final GraphBinaryWriter context) throws IOException {
        throw new IOException("A map entry should not be written individually");
    }

    @Override
    public Object transform(final Map.Entry value) {
        final Map map = new HashMap();
        map.put(value.getKey(), value.getValue());
        return map;
    }
}