modules/core/src/main/java/org/apache/ignite/internal/binary/BinaryTreeMap.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.ignite.internal.binary;

import java.io.ObjectStreamException;
import java.io.Serializable;
import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;
import org.apache.ignite.binary.BinaryObjectException;
import org.apache.ignite.binary.BinaryRawReader;
import org.apache.ignite.binary.BinaryRawWriter;
import org.apache.ignite.binary.BinaryReader;
import org.apache.ignite.binary.BinaryWriter;
import org.apache.ignite.binary.Binarylizable;

/**
 * Binary {@link TreeMap} wrapper.
 */
public class BinaryTreeMap implements Binarylizable, Serializable {
    /** */
    private static final long serialVersionUID = 0L;

    /** Original map. */
    private TreeMap map;

    /**
     * Default constructor.
     */
    public BinaryTreeMap() {
        // No-op.
    }

    /**
     * Constructor.
     *
     * @param map Original map.
     */
    public BinaryTreeMap(TreeMap map) {
        this.map = map;
    }

    /** {@inheritDoc} */
    @Override public void writeBinary(BinaryWriter writer) throws BinaryObjectException {
        BinaryRawWriter rawWriter = writer.rawWriter();

        rawWriter.writeObject(map.comparator());

        int size = map.size();

        rawWriter.writeInt(size);

        for (Map.Entry<Object, Object> entry : ((TreeMap<Object, Object>)map).entrySet()) {
            rawWriter.writeObject(entry.getKey());
            rawWriter.writeObject(entry.getValue());
        }
    }

    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    @Override public void readBinary(BinaryReader reader) throws BinaryObjectException {
        BinaryRawReader rawReader = reader.rawReader();

        Comparator comp = rawReader.readObject();

        map = comp == null ? new TreeMap() : new TreeMap(comp);

        int size = rawReader.readInt();

        for (int i = 0; i < size; i++)
            map.put(rawReader.readObject(), rawReader.readObject());
    }

    /**
     * Reconstructs object on unmarshalling.
     *
     * @return Reconstructed object.
     * @throws ObjectStreamException Thrown in case of unmarshalling error.
     */
    protected Object readResolve() throws ObjectStreamException {
        return map;
    }
}