| /* |
| * 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 org.apache.tools.ant.BuildException; |
| |
| import java.util.Enumeration; |
| |
| /** |
| * 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; |
| } |
| |
| } |