parquet.hadoop.codec.NonBlockedDecompressorStream.java Source code

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Here is the source code for parquet.hadoop.codec.NonBlockedDecompressorStream.java

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/**
 * Copyright 2012 Twitter, Inc.
 *
 * 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 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;
    }
}