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 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 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: }
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