01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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 property;
31:
32: /**
33: * Set the property attribute
34: *
35: * @param p the property name
36: */
37: public void setProperty(String 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: }
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