hadoop DeserializerComparator 源码
haddop DeserializerComparator 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/serializer/DeserializerComparator.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.hadoop.io.serializer;
import java.io.IOException;
import java.util.Comparator;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.InputBuffer;
import org.apache.hadoop.io.RawComparator;
/**
* <p>
* A {@link RawComparator} that uses a {@link Deserializer} to deserialize
* the objects to be compared so that the standard {@link Comparator} can
* be used to compare them.
* </p>
* <p>
* One may optimize compare-intensive operations by using a custom
* implementation of {@link RawComparator} that operates directly
* on byte representations.
* </p>
* @param <T> generic type.
*/
@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
@InterfaceStability.Evolving
public abstract class DeserializerComparator<T> implements RawComparator<T> {
private InputBuffer buffer = new InputBuffer();
private Deserializer<T> deserializer;
private T key1;
private T key2;
protected DeserializerComparator(Deserializer<T> deserializer)
throws IOException {
this.deserializer = deserializer;
this.deserializer.open(buffer);
}
@Override
public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
try {
buffer.reset(b1, s1, l1);
key1 = deserializer.deserialize(key1);
buffer.reset(b2, s2, l2);
key2 = deserializer.deserialize(key2);
} catch (IOException e) {
throw new RuntimeException(e);
}
return compare(key1, key2);
}
}
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