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Java > Open Source Codes > org > apache > tools > ant > types > resources > comparators > FileSystem


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  */
18 package org.apache.tools.ant.types.resources.comparators;
19
20 import java.io.File JavaDoc;
21 import org.apache.tools.ant.types.Resource;
22 import org.apache.tools.ant.types.resources.FileResource;
23 import org.apache.tools.ant.util.FileUtils;
24
25 /**
26  * Compares filesystem Resources.
27  * @since Ant 1.7
28  */
29 public class FileSystem extends ResourceComparator {
30     private static final FileUtils FILE_UTILS = FileUtils.getFileUtils();
31
32     /**
33      * Compare two Resources.
34      * @param foo the first Resource.
35      * @param bar the second Resource.
36      * @return a negative integer, zero, or a positive integer as the first
37      * argument is less than, equal to, or greater than the second.
38      * @throws ClassCastException if either resource is not an instance of FileResource.
39      */
40     protected int resourceCompare(Resource foo, Resource bar) {
41         File JavaDoc foofile = ((FileResource) foo).getFile();
42         File JavaDoc barfile = ((FileResource) bar).getFile();
43         return foofile.equals(barfile) ? 0
44             : FILE_UTILS.isLeadingPath(foofile, barfile) ? -1
45             : FILE_UTILS.normalize(foofile.getAbsolutePath()).compareTo(
46                 FILE_UTILS.normalize(barfile.getAbsolutePath()));
47     }
48
49 }
50
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