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Java > Open Source Codes > org > apache > tools > ant > taskdefs > condition > IsFalse


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
19 package org.apache.tools.ant.taskdefs.condition;
20
21 import org.apache.tools.ant.BuildException;
22 import org.apache.tools.ant.ProjectComponent;
23
24 /**
25  * Condition that tests whether a given string evals to false
26  *
27  * @since Ant 1.5
28  */
29 public class IsFalse extends ProjectComponent implements Condition {
30     /**
31      * what we eval
32      */
33     private Boolean JavaDoc value = null;
34
35     /**
36      * set the value to be tested; let ant eval it to true/false
37      * @param value the value to test
38      */
39     public void setValue(boolean value) {
40         this.value = value ? Boolean.TRUE : Boolean.FALSE;
41     }
42
43     /**
44      * @return the inverted value;
45      * @throws BuildException if someone forgot to spec a value
46      */
47     public boolean eval() throws BuildException {
48         if (value == null) {
49             throw new BuildException("Nothing to test for falsehood");
50         }
51         return !value.booleanValue();
52     }
53
54 }
55
56
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