| /* |
| * 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.types.resources.comparators; |
| |
| import java.util.Stack; |
| |
| import org.apache.tools.ant.BuildException; |
| import org.apache.tools.ant.Project; |
| import org.apache.tools.ant.types.DataType; |
| import org.apache.tools.ant.types.Resource; |
| |
| /** |
| * Reverses another ResourceComparator. If no nested ResourceComparator |
| * is supplied, the compared Resources' natural order will be reversed. |
| * @since Ant 1.7 |
| */ |
| public class Reverse extends ResourceComparator { |
| private static final String ONE_NESTED |
| = "You must not nest more than one ResourceComparator for reversal."; |
| |
| private ResourceComparator nested; |
| |
| /** |
| * Default constructor. |
| */ |
| public Reverse() { |
| } |
| |
| /** |
| * Construct a new Reverse, supplying the ResourceComparator to be reversed. |
| * @param c the ResourceComparator to reverse. |
| */ |
| public Reverse(ResourceComparator c) { |
| add(c); |
| } |
| |
| /** |
| * Add the ResourceComparator to reverse. |
| * @param c the ResourceComparator to add. |
| */ |
| public void add(ResourceComparator c) { |
| if (nested != null) { |
| throw new BuildException(ONE_NESTED); |
| } |
| nested = c; |
| setChecked(false); |
| } |
| |
| /** |
| * Compare two Resources. |
| * @param foo the first Resource. |
| * @param bar the second Resource. |
| * @return a negative integer, zero, or a positive integer as the first |
| * argument is greater than, equal to, or less than the second. |
| */ |
| protected int resourceCompare(Resource foo, Resource bar) { |
| return -1 * (nested == null |
| ? foo.compareTo(bar) : nested.compare(foo, bar)); |
| } |
| |
| protected void dieOnCircularReference(Stack<Object> stk, Project p) |
| throws BuildException { |
| if (isChecked()) { |
| return; |
| } |
| if (isReference()) { |
| super.dieOnCircularReference(stk, p); |
| } else { |
| if (nested != null) { |
| pushAndInvokeCircularReferenceCheck((DataType) nested, stk, |
| p); |
| } |
| setChecked(true); |
| } |
| } |
| } |