/**
* Copyright 2013 LiveRamp
*
* Licensed 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 com.liveramp.hank.compression.common;
import com.liveramp.hank.compression.Decompressor;
import com.liveramp.hank.util.IOStreamUtils;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public abstract class StreamCopyDecompressor implements Decompressor {
private final byte[] copyBuffer = new byte[IOStreamUtils.DEFAULT_BUFFER_SIZE];
@Override
public void decompressBlock(byte[] buffer, int offset, int length, OutputStream outputStream) throws IOException {
// Decompress the block
InputStream blockInputStream = new ByteArrayInputStream(buffer, offset, length);
// Build an InputStream corresponding to the compression codec
InputStream decompressedBlockInputStream = getBlockDecompressionInputStream(blockInputStream);
// Decompress into the specialized result buffer
IOStreamUtils.copy(decompressedBlockInputStream, outputStream, copyBuffer);
decompressedBlockInputStream.close();
}
protected abstract InputStream getBlockDecompressionInputStream(InputStream inputStream) throws IOException;
}