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/*
* Copyright 2001-2004 Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.taskdefs;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.condition.Condition;
import org.apache.tools.ant.taskdefs.condition.ConditionBase;
/**
* Task to set a property conditionally using <uptodate>, <available>,
* and many other supported conditions.
*
* <p>This task supports boolean logic as well as pluggable conditions
* to decide, whether a property should be set.</p>
*
* <p>This task does not extend Task to take advantage of
* ConditionBase.</p>
*
* @author Stefan Bodewig
* @version $Revision$
*
* @since Ant 1.4
*
* @ant.task category="control"
*/
public class ConditionTask extends ConditionBase {
private String property = null;
private String value = "true";
/**
* The name of the property to set. Required.
* @param p the name of the property
* @since Ant 1.4
*/
public void setProperty(String p) {
property = p;
}
/**
* The value for the property to set, if condition evaluates to true.
* Defaults to "true".
* @param v the value of the property
* @since Ant 1.4
*/
public void setValue(String v) {
value = v;
}
/**
* See whether our nested condition holds and set the property.
*
* @since Ant 1.4
* @exception BuildException if an error occurs
*/
public void execute() throws BuildException {
if (countConditions() > 1) {
throw new BuildException("You must not nest more than one "
+ "condition into <condition>");
}
if (countConditions() < 1) {
throw new BuildException("You must nest a condition into "
+ "<condition>");
}
if (property == null) {
throw new BuildException("The property attribute is required.");
}
Condition c = (Condition) getConditions().nextElement();
if (c.eval()) {
log("Condition true; setting " + property + " to " + value,
Project.MSG_DEBUG);
getProject().setNewProperty(property, value);
} else {
log("Condition false; not setting " + property,
Project.MSG_DEBUG);
}
}
}
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