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Compressor.java
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Compressor.java
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/*
* Copyright (c) 2000, 2017 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2022 Contributors to Eclipse Foundation. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
/*
* @(#)Compressor.java 1.3 06/27/07
*/
package com.sun.messaging.jmq.jmsclient.zip;
import java.util.zip.*;
import java.io.*;
import com.sun.messaging.jmq.jmsclient.Debug;
public class Compressor {
private Deflater deflater = new Deflater();
// private Deflater noWrapDeflater = new Deflater (Deflater.DEFAULT_COMPRESSION, true);
private static Compressor compressor = new Compressor();
private boolean debug = Boolean.getBoolean("imq.zip.debug");
private Compressor() {
}
public static Compressor getInstance() {
return compressor;
}
public synchronized int compress(byte[] body, int offset, int length, OutputStream os) throws IOException {
Deflater def = getDefaultDeflater();
DeflaterOutputStream defos = new DeflaterOutputStream(os, def);
defos.write(body, offset, length);
defos.finish();
int totalIn = def.getTotalIn();
int compressedLength = def.getTotalOut();
if (debug) {
Debug.getPrintStream().println("**** compressor total in: " + totalIn);
Debug.getPrintStream().println("**** compressor total out: " + compressedLength);
}
def.reset();
return compressedLength;
}
private Deflater getDeflater(boolean noWrap, int strategy, int level) {
Deflater def = null;
if (noWrap) {
// def = noWrapDeflater;
throw new RuntimeException("No wrap deflater is not Unsupported.");
} else {
def = deflater;
}
def.setStrategy(strategy);
def.setLevel(level);
return def;
}
private Deflater getDefaultDeflater() {
return getDeflater(false, Deflater.DEFAULT_STRATEGY, Deflater.DEFAULT_COMPRESSION);
}
}