/*
* 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.hbase.io.encoding;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import org.apache.hadoop.hbase.io.compress.Compression;
import org.apache.hadoop.hbase.io.compress.Compression.Algorithm;
/**
* A default implementation of {@link HFileBlockDecodingContext}. It assumes the
* block data section is compressed as a whole.
*
* @see HFileBlockDefaultEncodingContext for the default compression context
*
*/
public class HFileBlockDefaultDecodingContext implements
HFileBlockDecodingContext {
private final Compression.Algorithm compressAlgo;
public HFileBlockDefaultDecodingContext(
Compression.Algorithm compressAlgo) {
this.compressAlgo = compressAlgo;
}
@Override
public void prepareDecoding(int onDiskSizeWithoutHeader, int uncompressedSizeWithoutHeader,
ByteBuffer blockBufferWithoutHeader, byte[] onDiskBlock, int offset) throws IOException {
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(onDiskBlock, offset,
onDiskSizeWithoutHeader));
Compression.decompress(blockBufferWithoutHeader.array(),
blockBufferWithoutHeader.arrayOffset(), (InputStream) dis, onDiskSizeWithoutHeader,
uncompressedSizeWithoutHeader, compressAlgo);
}
@Override
public Algorithm getCompression() {
return compressAlgo;
}
}