001/*
002 * Logback: the reliable, generic, fast and flexible logging framework.
003 * Copyright (C) 1999-2025, QOS.ch. All rights reserved.
004 *
005 * This program and the accompanying materials are dual-licensed under
006 * either the terms of the Eclipse Public License v1.0 as published by
007 * the Eclipse Foundation
008 *
009 *   or (per the licensee's choosing)
010 *
011 * under the terms of the GNU Lesser General Public License version 2.1
012 * as published by the Free Software Foundation.
013 */
014
015package ch.qos.logback.core.rolling.helper;
016
017import ch.qos.logback.core.status.ErrorStatus;
018import ch.qos.logback.core.status.WarnStatus;
019
020import java.io.File;
021import java.io.FileInputStream;
022import java.io.FileOutputStream;
023import java.util.zip.GZIPOutputStream;
024
025public class GZCompressionStrategy extends CompressionStrategyBase {
026
027
028    @Override
029    public void compress(String originalFileName, String compressedFileName, String innerEntryName) {
030
031        File file2gz = new File(originalFileName);
032
033        if (!file2gz.exists()) {
034            addStatus(new WarnStatus("The file to compress named [" + originalFileName + "] does not exist.", this));
035
036            return;
037        }
038
039        if (!compressedFileName.endsWith(".gz")) {
040            compressedFileName = compressedFileName + ".gz";
041        }
042
043        File gzedFile = new File(compressedFileName);
044
045        if (gzedFile.exists()) {
046            addWarn("The target compressed file named [" + compressedFileName + "] exist already. Aborting file compression.");
047            return;
048        }
049
050        addInfo("GZ compressing [" + file2gz + "] as [" + gzedFile + "]");
051        createMissingTargetDirsIfNecessary(gzedFile);
052        try (FileInputStream fis = new FileInputStream(originalFileName);
053             GZIPOutputStream gzos = new GZIPOutputStream(new FileOutputStream(compressedFileName), BUFFER_SIZE)) {
054
055            byte[] inbuf = new byte[BUFFER_SIZE];
056            int n;
057
058            while ((n = fis.read(inbuf)) != -1) {
059                gzos.write(inbuf, 0, n);
060            }
061
062            addInfo("Done GZ compressing [" + file2gz + "] as [" + gzedFile + "]");
063        } catch (Exception e) {
064            addStatus(new ErrorStatus("Error occurred while compressing [" + originalFileName + "] into [" + compressedFileName + "].", this, e));
065        }
066
067        if (!file2gz.delete()) {
068            addStatus(new WarnStatus("Could not delete [" + originalFileName + "].", this));
069        }
070    }
071
072}