c3.ops.priam.compress.SnappyCompression.java Source code

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Here is the source code for c3.ops.priam.compress.SnappyCompression.java

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/**
 * Copyright 2013 Netflix, 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 c3.ops.priam.compress;

import org.apache.commons.io.IOUtils;
import org.xerial.snappy.SnappyInputStream;

import java.io.*;
import java.util.Iterator;

/**
 * Class to generate compressed chunks of data from an input stream using
 * SnappyCompression
 */
public class SnappyCompression implements ICompression {
    private static final int BUFFER = 2 * 1024;

    @Override
    public Iterator<byte[]> compress(InputStream is, long chunkSize) throws IOException {
        return new ChunkedStream(is, chunkSize);
    }

    @Override
    public void decompressAndClose(InputStream input, OutputStream output) throws IOException {
        try {
            decompress(input, output);
        } finally {
            IOUtils.closeQuietly(input);
            IOUtils.closeQuietly(output);
        }
    }

    private void decompress(InputStream input, OutputStream output) throws IOException {
        SnappyInputStream is = new SnappyInputStream(new BufferedInputStream(input));
        byte data[] = new byte[BUFFER];
        BufferedOutputStream dest1 = new BufferedOutputStream(output, BUFFER);
        try {
            int c;
            while ((c = is.read(data, 0, BUFFER)) != -1) {
                dest1.write(data, 0, c);
            }
        } finally {
            IOUtils.closeQuietly(dest1);
            IOUtils.closeQuietly(is);
        }
    }
}