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


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 property has been set.
26  *
27  * @since Ant 1.5
28  */
29 public class IsSet extends ProjectComponent implements Condition {
30     private String JavaDoc property;
31
32     /**
33      * Set the property attribute
34      *
35      * @param p the property name
36      */
37     public void setProperty(String JavaDoc p) {
38         property = p;
39     }
40
41     /**
42      * @return true if the property exists
43      * @exception BuildException if the property attribute is not set
44      */
45     public boolean eval() throws BuildException {
46         if (property == null) {
47             throw new BuildException("No property specified for isset "
48                                      + "condition");
49         }
50
51         return getProject().getProperty(property) != null;
52     }
53
54 }
55
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