diff options
Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/comparators/Reverse.java')
-rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/comparators/Reverse.java | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/comparators/Reverse.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/comparators/Reverse.java new file mode 100644 index 00000000..c787a765 --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/comparators/Reverse.java @@ -0,0 +1,91 @@ +/* + * 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 instanceof DataType) { + pushAndInvokeCircularReferenceCheck((DataType) nested, stk, + p); + } + setChecked(true); + } + } +} |