Java tutorial
/* * 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.parquet.hadoop.codec; import java.io.IOException; import java.io.InputStream; import org.apache.hadoop.io.compress.Decompressor; import org.apache.hadoop.io.compress.DecompressorStream; /** * DecompressorStream class that should be used instead of the default hadoop DecompressorStream * object. Hadoop's compressor adds blocking ontop of the compression codec. We don't want * that since our Pages already solve the need to add blocking. */ public class NonBlockedDecompressorStream extends DecompressorStream { private boolean inputHandled; public NonBlockedDecompressorStream(InputStream stream, Decompressor decompressor, int bufferSize) throws IOException { super(stream, decompressor, bufferSize); } @Override public int read(byte[] b, int off, int len) throws IOException { if (!inputHandled) { // Send all the compressed input to the decompressor. while (true) { int compressedBytes = getCompressedData(); if (compressedBytes == -1) break; decompressor.setInput(buffer, 0, compressedBytes); } inputHandled = true; } int decompressedBytes = decompressor.decompress(b, off, len); if (decompressor.finished()) { decompressor.reset(); } return decompressedBytes; } }