com.intuit.ipp.compression.GZIPCompressor Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2017 Intuit
*
* 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.intuit.ipp.compression;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import com.intuit.ipp.exception.CompressionException;
import com.intuit.ipp.util.Logger;
import com.intuit.ipp.util.StringUtils;
/**
* Class to compress/decompress the given data using GZIP compression algorithm
*
*/
public class GZIPCompressor implements ICompressor {
/**
* logger instance
*/
private static final org.slf4j.Logger LOG = Logger.getLogger();
/**
* variable LENGTH_256
*/
private static final int LENGTH_256 = 256;
/** {@inheritDoc} */
public byte[] compress(final String data, byte[] uploadFile) throws CompressionException {
if (!StringUtils.hasText(data)) {
return null;
}
ByteArrayOutputStream baos = null;
OutputStream gzout = null;
byte[] compressedData = null;
try {
baos = new ByteArrayOutputStream();
gzout = new GZIPOutputStream(baos);
gzout.write(data.getBytes(StandardCharsets.UTF_8));
if (uploadFile != null) {
gzout.write(uploadFile);
}
gzout.close();
compressedData = baos.toByteArray();
return compressedData;
} catch (IOException ioe) {
LOG.error("IOException while compress the data using GZIP compression.", ioe);
throw new CompressionException(ioe);
} finally {
if (baos != null) {
try {
baos.close();
} catch (IOException e) {
LOG.error("Unable to close ByteArrayOutputStream.");
}
}
}
}
/**
* {@inheritDoc}
*/
public OutputStream decompress(final InputStream in) throws CompressionException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
InputStream inflater = new GZIPInputStream(in);
byte[] bbuf = new byte[LENGTH_256];
while (true) {
int r = inflater.read(bbuf);
if (r < 0) {
break;
}
baos.write(bbuf, 0, r);
}
return baos;
} catch (IOException ioe) {
LOG.error("IOException while decompress the data using GZIP compression.", ioe);
throw new CompressionException(ioe);
} finally {
if (baos != null) {
try {
baos.close();
} catch (IOException e) {
LOG.error("Unable to close ByteArrayOutputStream.");
}
}
}
}
}