/*
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2026, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v2.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package ch.qos.logback.core.rolling.helper;
  
  import java.io.*;
  
  import org.tukaani.xz.LZMA2Options;
  import org.tukaani.xz.XZOutputStream;
  
  /**
   * Compresses files using <a href="https://tukaani.org/xz/">tukaani.org/xz</a> library.
   *
   * <p>Note that </p>
   *
   * @author Marian Kazimir
   * @author Ceki G&uuml;lc&uuml;
   * @since 1.5.18
   */
  public class XZCompressionStrategy extends CompressionStrategyBase {
  
      @Override
      public void compress(String nameOfFile2xz, String nameOfxzedFile, String innerEntryName) {
          File file2xz = new File(nameOfFile2xz);
  
          if (!file2xz.exists()) {
              addWarn("The file to compress named [" + nameOfFile2xz + "] does not exist.");
  
              return;
          }
  
          if (!nameOfxzedFile.endsWith(".xz")) {
              nameOfxzedFile = nameOfxzedFile + ".xz";
          }
  
          File xzedFile = new File(nameOfxzedFile);
  
          if (xzedFile.exists()) {
              addWarn("The target compressed file named [" + nameOfxzedFile + "] exist already. Aborting file compression.");
              return;
          }
  
          addInfo("XZ compressing [" + file2xz + "] as [" + xzedFile + "]");
          createMissingTargetDirsIfNecessary(xzedFile);
  
          try (FileInputStream fis = new FileInputStream(nameOfFile2xz);
               XZOutputStream xzos = new XZOutputStream(new BufferedOutputStream(new FileOutputStream(nameOfxzedFile), BUFFER_SIZE), new LZMA2Options())) {
  
              byte[] inbuf = new byte[BUFFER_SIZE];
              int n;
  
              while ((n = fis.read(inbuf)) != -1) {
                  xzos.write(inbuf, 0, n);
              }
          } catch (Exception e) {
              addError("Error occurred while compressing [" + nameOfFile2xz + "] into [" + nameOfxzedFile + "].", e);
          }
  
          if (!file2xz.delete()) {
              addWarn("Could not delete [" + nameOfFile2xz + "].");
          }
      }
  }