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


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 org.apache.tools.ant.types.Resource;
21
22 /**
23  * Compares Resources by existence. Not existing is "less than" existing.
24  * @since Ant 1.7
25  */
26 public class Exists extends ResourceComparator {
27
28     /**
29      * Compare two Resources.
30      * @param foo the first Resource.
31      * @param bar the second Resource.
32      * @return a negative integer, zero, or a positive integer as the first
33      * argument is less than, equal to, or greater than the second.
34      */
35     protected int resourceCompare(Resource foo, Resource bar) {
36         boolean f = foo.isExists();
37         if (f == bar.isExists()) {
38             return 0;
39         }
40         return f ? 1 : -1;
41     }
42
43 }
44
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