hadoop RawComparable 源码
haddop RawComparable 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/file/tfile/RawComparable.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.file.tfile;
import java.util.Collections;
import java.util.Comparator;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.RawComparator;
/**
* Interface for objects that can be compared through {@link RawComparator}.
* This is useful in places where we need a single object reference to specify a
* range of bytes in a byte array, such as {@link Comparable} or
* {@link Collections#binarySearch(java.util.List, Object, Comparator)}
*
* The actual comparison among RawComparable's requires an external
* RawComparator and it is applications' responsibility to ensure two
* RawComparable are supposed to be semantically comparable with the same
* RawComparator.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface RawComparable {
/**
* Get the underlying byte array.
*
* @return The underlying byte array.
*/
abstract byte[] buffer();
/**
* Get the offset of the first byte in the byte array.
*
* @return The offset of the first byte in the byte array.
*/
abstract int offset();
/**
* Get the size of the byte range in the byte array.
*
* @return The size of the byte range in the byte array.
*/
abstract int size();
}
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