001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    
019    package org.apache.hadoop.io.serializer;
020    
021    import java.io.IOException;
022    import java.io.Serializable;
023    
024    import org.apache.hadoop.classification.InterfaceAudience;
025    import org.apache.hadoop.classification.InterfaceStability;
026    import org.apache.hadoop.io.RawComparator;
027    
028    /**
029     * <p>
030     * A {@link RawComparator} that uses a {@link JavaSerialization}
031     * {@link Deserializer} to deserialize objects that are then compared via
032     * their {@link Comparable} interfaces.
033     * </p>
034     * @param <T>
035     * @see JavaSerialization
036     */
037    @InterfaceAudience.Public
038    @InterfaceStability.Unstable
039    public class JavaSerializationComparator<T extends Serializable&Comparable<T>>
040      extends DeserializerComparator<T> {
041    
042      @InterfaceAudience.Private
043      public JavaSerializationComparator() throws IOException {
044        super(new JavaSerialization.JavaSerializationDeserializer<T>());
045      }
046    
047      @Override
048      @InterfaceAudience.Private
049      public int compare(T o1, T o2) {
050        return o1.compareTo(o2);
051      }
052    
053    }