| 1 | /*
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| 2 | * Copyright 2001-2005 The Apache Software Foundation
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | *
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| 16 | */
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| 17 |
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| 18 | package org.apache.tools.ant.taskdefs.condition;
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| 19 |
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| 20 | import org.apache.tools.ant.BuildException;
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| 21 | import org.apache.tools.ant.ProjectComponent;
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| 22 |
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| 23 | /**
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| 24 | * Condition that tests whether a given property has been set.
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| 25 | *
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| 26 | * @since Ant 1.5
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| 27 | */
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| 28 | public class IsSet extends ProjectComponent implements Condition {
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| 29 | private String property;
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| 30 |
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| 31 | /**
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| 32 | * Set the property attribute
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| 33 | *
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| 34 | * @param p the property name
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| 35 | */
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| 36 | public void setProperty(String p) {
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| 37 | property = p;
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| 38 | }
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| 39 |
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| 40 | /**
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| 41 | * @return true if the property exists
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| 42 | * @exception BuildException if the property attribute is not set
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| 43 | */
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| 44 | public boolean eval() throws BuildException {
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| 45 | if (property == null) {
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| 46 | throw new BuildException("No property specified for isset "
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| 47 | + "condition");
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| 48 | }
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| 49 |
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| 50 | return getProject().getProperty(property) != null;
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| 51 | }
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| 52 |
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| 53 | }
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