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.types.resources.comparators;
  
  import java.io.File;
  import java.util.Comparator;
  import java.util.Objects;
  import java.util.function.Function;
  
  import org.apache.tools.ant.types.Resource;
  import org.apache.tools.ant.types.resources.FileProvider;
  import org.apache.tools.ant.util.FileUtils;
  
  /**
   * Compares filesystem Resources.
   * @since Ant 1.7
   */
  public class FileSystem extends ResourceComparator {
      private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
  
      /**
       * Compare two Resources.
       * @param foo the first Resource.
       * @param bar the second Resource.
       * @return a negative integer, zero, or a positive integer as the first
       *         argument is less than, equal to, or greater than the second.
       * @throws ClassCastException if either resource is not capable of
       *         exposing a {@link FileProvider}
       */
      protected int resourceCompare(Resource foo, Resource bar) {
          return compare(file(foo), file(bar));
      }
  
      private File file(Resource r) {
          return r.asOptional(FileProvider.class)
              .orElseThrow(() -> new ClassCastException(
                  r.getClass() + " doesn't provide files"))
              .getFile();
      }
  
      private int compare(File f1, File f2) {
          if (Objects.equals(f1, f2)) {
              return 0;
          }
          if (FILE_UTILS.isLeadingPath(f1, f2)) {
              return -1;
          }
          if (FILE_UTILS.isLeadingPath(f2, f1)) {
              return 1;
          }
          return Comparator
              .comparing(((Function<File, String>) File::getAbsolutePath)
                  .andThen(FILE_UTILS::normalize))
              .compare(f1, f2);
      }
  }
  