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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.condition;
import java.util.Enumeration;
import org.apache.tools.ant.BuildException;
/**
* The <tt>Xor</tt> condition type to exclusive or operations.
* This does not shortcut stuff.
* @since Ant 1.7
*/
public class Xor extends ConditionBase implements Condition {
/**
* Evaluate the contained conditions.
* @return the result of xoring the conditions together.
* @throws org.apache.tools.ant.BuildException
* if an error occurs.
*/
public boolean eval() throws BuildException {
Enumeration e = getConditions();
//initial state is false.
boolean state = false;
while (e.hasMoreElements()) {
Condition c = (Condition) e.nextElement();
//every condition is xored against the previous one
state ^= c.eval();
}
return state;
}
}
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