content: /*
   *  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
   *
   *      https://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 org.apache.tools.ant.taskdefs.optional.xz;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.nio.file.Files;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.taskdefs.Unpack;
  import org.tukaani.xz.XZInputStream;
  
  /**
   * Expands a file that has been compressed with the XZ
   * algorithm. Normally used to compress non-compressed archives such
   * as TAR files.
   *
   * @since Ant 1.10.1
   *
   * @ant.task category="packaging"
   */
  
  public class Unxz extends Unpack {
      private static final int BUFFER_SIZE = 8 * 1024;
      private static final String DEFAULT_EXTENSION = ".xz";
  
      /**
       * Get the default extension.
       * @return the value ".xz"
       */
      @Override
      protected String getDefaultExtension() {
          return DEFAULT_EXTENSION;
      }
  
      /**
       * Implement the gunzipping.
       */
      @Override
      protected void extract() {
          if (srcResource.getLastModified() > dest.lastModified()) {
              log("Expanding " + srcResource.getName() + " to "
                          + dest.getAbsolutePath());
  
              try (XZInputStream zIn =
                  new XZInputStream(srcResource.getInputStream());
                      OutputStream out = Files.newOutputStream(dest.toPath())) {
                  byte[] buffer = new byte[BUFFER_SIZE];
                  int count = 0;
                  do {
                      out.write(buffer, 0, count);
                      count = zIn.read(buffer, 0, buffer.length);
                  } while (count != -1);
              } catch (IOException ioe) {
                  String msg = "Problem expanding xz " + ioe.getMessage();
                  throw new BuildException(msg, ioe, getLocation());
              }
          }
      }
  
      /**
       * Whether this task can deal with non-file resources.
       *
       * <p>This implementation returns true only.</p>
       * @return true
       */
      @Override
      protected boolean supportsNonFileResources() {
          return true;
      }
  }
  