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core/src/main/java/org/apache/carbondata/core/datastore/compression/GzipCompressor.java
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| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.carbondata.core.datastore.compression; | ||
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| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
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| import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream; | ||
| import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream; | ||
|
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| /** | ||
| * Codec Class for performing Gzip Compression | ||
| */ | ||
| public class GzipCompressor extends AbstractCompressor { | ||
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| @Override public String getName() { | ||
| return "gzip"; | ||
| } | ||
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| /** | ||
| * This method takes the Byte Array data and Compresses in gzip format | ||
| * | ||
| * @param data Data Byte Array passed for compression | ||
| * @return Compressed Byte Array | ||
| */ | ||
| private byte[] compressData(byte[] data) { | ||
| ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); | ||
| try { | ||
| GzipCompressorOutputStream gzipCompressorOutputStream = | ||
| new GzipCompressorOutputStream(byteArrayOutputStream); | ||
| try { | ||
| /** | ||
| * Below api will write bytes from specified byte array to the gzipCompressorOutputStream | ||
| * The output stream will compress the given byte array. | ||
| */ | ||
| gzipCompressorOutputStream.write(data); | ||
| } catch (IOException e) { | ||
| throw new RuntimeException("Error during Compression writing step ", e); | ||
| } finally { | ||
| gzipCompressorOutputStream.close(); | ||
| } | ||
| } catch (IOException e) { | ||
| throw new RuntimeException("Error during Compression step ", e); | ||
| } | ||
| return byteArrayOutputStream.toByteArray(); | ||
| } | ||
|
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| /** | ||
| * This method takes the Byte Array data and Decompresses in gzip format | ||
| * | ||
| * @param data Data Byte Array for Compression | ||
| * @param offset Start value of Data Byte Array | ||
| * @param length Size of Byte Array | ||
| * @return | ||
| */ | ||
| private byte[] decompressData(byte[] data, int offset, int length) { | ||
| ByteArrayInputStream byteArrayOutputStream = new ByteArrayInputStream(data, offset, length); | ||
| ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream(); | ||
| try { | ||
| GzipCompressorInputStream gzipCompressorInputStream = | ||
| new GzipCompressorInputStream(byteArrayOutputStream); | ||
| byte[] buffer = new byte[1024]; | ||
| int len; | ||
| /** | ||
| * Reads the next byte of the data from the input stream and stores them into buffer | ||
| * Data is then read from the buffer and put into byteOutputStream from a offset. | ||
| */ | ||
| while ((len = gzipCompressorInputStream.read(buffer)) != -1) { | ||
| byteOutputStream.write(buffer, 0, len); | ||
| } | ||
| } catch (IOException e) { | ||
| throw new RuntimeException("Error during Decompression step ",e); | ||
| } | ||
| return byteOutputStream.toByteArray(); | ||
| } | ||
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| @Override public byte[] compressByte(byte[] unCompInput) { | ||
| return compressData(unCompInput); | ||
| } | ||
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| @Override public byte[] compressByte(byte[] unCompInput, int byteSize) { | ||
| return compressData(unCompInput); | ||
| } | ||
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| @Override public byte[] unCompressByte(byte[] compInput) { | ||
| return decompressData(compInput, 0, compInput.length); | ||
| } | ||
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| @Override public byte[] unCompressByte(byte[] compInput, int offset, int length) { | ||
| return decompressData(compInput, offset, length); | ||
| } | ||
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| @Override public long rawUncompress(byte[] input, byte[] output) { | ||
| //gzip api doesnt have rawUncompress yet. | ||
| throw new RuntimeException("Not implemented rawUcompress for gzip yet"); | ||
| } | ||
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| @Override public long maxCompressedLength(long inputSize) { | ||
| // Check if input size is lower than the max possible size | ||
| if (inputSize < Integer.MAX_VALUE) { | ||
| return inputSize; | ||
| } else { | ||
| throw new RuntimeException("compress input oversize for gzip"); | ||
| } | ||
| } | ||
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| @Override public int unCompressedLength(byte[] data, int offset, int length) { | ||
| //gzip api doesnt have UncompressedLength | ||
| throw new RuntimeException("Unsupported operation Exception"); | ||
| } | ||
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| @Override public int rawUncompress(byte[] data, int offset, int length, byte[] output) { | ||
| //gzip api doesnt have rawUncompress yet. | ||
| throw new RuntimeException("Not implemented rawUcompress for gzip yet"); | ||
| } | ||
| } |
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