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Java > Open Source Codes > org > apache > tools > ant > types > resources > selectors > Not


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.selectors;
19
20 import org.apache.tools.ant.types.Resource;
21
22 /**
23  * Not ResourceSelector.
24  * @since Ant 1.7
25  */
26 public class Not implements ResourceSelector {
27
28     private ResourceSelector sel;
29
30     /**
31      * Default constructor.
32      */
33     public Not() {
34     }
35
36     /**
37      * Convenience constructor.
38      * @param s the ResourceSelector to negate.
39      */
40     public Not(ResourceSelector s) {
41         add(s);
42     }
43
44     /**
45      * Set the ResourceSelector.
46      * @param s the ResourceSelector to negate.
47      * @throws IllegalStateException if already set.
48      */
49     public void add(ResourceSelector s) {
50         if (sel != null) {
51             throw new IllegalStateException JavaDoc(
52                 "The Not ResourceSelector accepts a single nested ResourceSelector");
53         }
54         sel = s;
55     }
56
57     /**
58      * Return true if this Resource is selected.
59      * @param r the Resource to check.
60      * @return whether the Resource was selected.
61      */
62     public boolean isSelected(Resource r) {
63         return !(sel.isSelected(r));
64     }
65
66 }
67
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