hadoop ByteArray 源码
haddop ByteArray 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/file/tfile/ByteArray.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 org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.io.BytesWritable;
/**
* Adaptor class to wrap byte-array backed objects (including java byte array)
* as RawComparable objects.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public final class ByteArray implements RawComparable {
private final byte[] buffer;
private final int offset;
private final int len;
/**
* Constructing a ByteArray from a {@link BytesWritable}.
*
* @param other other.
*/
public ByteArray(BytesWritable other) {
this(other.getBytes(), 0, other.getLength());
}
/**
* Wrap a whole byte array as a RawComparable.
*
* @param buffer
* the byte array buffer.
*/
public ByteArray(byte[] buffer) {
this(buffer, 0, buffer.length);
}
/**
* Wrap a partial byte array as a RawComparable.
*
* @param buffer
* the byte array buffer.
* @param offset
* the starting offset
* @param len
* the length of the consecutive bytes to be wrapped.
*/
public ByteArray(byte[] buffer, int offset, int len) {
if ((offset | len | (buffer.length - offset - len)) < 0) {
throw new IndexOutOfBoundsException();
}
this.buffer = buffer;
this.offset = offset;
this.len = len;
}
/**
* @return the underlying buffer.
*/
@Override
public byte[] buffer() {
return buffer;
}
/**
* @return the offset in the buffer.
*/
@Override
public int offset() {
return offset;
}
/**
* @return the size of the byte array.
*/
@Override
public int size() {
return len;
}
}
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