| /* |
| * 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 java.util.Vector; |
| import java.util.Iterator; |
| |
| 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; |
| |
| /** |
| * Delegates to other ResourceComparators or, if none specified, |
| * uses Resources' natural ordering. |
| * @since Ant 1.7 |
| */ |
| public class DelegatedResourceComparator extends ResourceComparator { |
| |
| private Vector v = null; |
| |
| /** |
| * Add a delegate ResourceComparator. |
| * @param c the next delegate ResourceComparator. |
| */ |
| public synchronized void add(ResourceComparator c) { |
| if (isReference()) { |
| throw noChildrenAllowed(); |
| } |
| if (c == null) { |
| return; |
| } |
| v = (v == null) ? new Vector() : v; |
| v.add(c); |
| } |
| |
| /** |
| * Equality method based on the vector of resources, |
| * or if a reference, the referredto object. |
| * @param o the object to check against. |
| * @return true if there is equality. |
| */ |
| public synchronized boolean equals(Object o) { |
| if (o == this) { |
| return true; |
| } |
| if (isReference()) { |
| return getCheckedRef().equals(o); |
| } |
| if (!(o instanceof DelegatedResourceComparator)) { |
| return false; |
| } |
| Vector ov = ((DelegatedResourceComparator) o).v; |
| return v == null ? ov == null : v.equals(ov); |
| } |
| |
| /** |
| * Hashcode based on the rules for equality. |
| * @return a hashcode. |
| */ |
| public synchronized int hashCode() { |
| if (isReference()) { |
| return getCheckedRef().hashCode(); |
| } |
| return v == null ? 0 : v.hashCode(); |
| } |
| |
| /** {@inheritDoc} */ |
| protected synchronized int resourceCompare(Resource foo, Resource bar) { |
| //if no nested, natural order: |
| if (v == null || v.isEmpty()) { |
| return foo.compareTo(bar); |
| } |
| int result = 0; |
| for (Iterator i = v.iterator(); result == 0 && i.hasNext();) { |
| result = ((ResourceComparator) i.next()).resourceCompare(foo, bar); |
| } |
| return result; |
| } |
| |
| /** |
| * Overrides the version from DataType to recurse on nested ResourceSelector |
| s. |
| * @param stk the Stack of references. |
| * @param p the Project to resolve against. |
| * @throws BuildException on error. |
| */ |
| protected void dieOnCircularReference(Stack stk, Project p) |
| throws BuildException { |
| if (isChecked()) { |
| return; |
| } |
| if (isReference()) { |
| super.dieOnCircularReference(stk, p); |
| } else { |
| if (!(v == null || v.isEmpty())) { |
| for (Iterator i = v.iterator(); i.hasNext();) { |
| Object o = i.next(); |
| if (o instanceof DataType) { |
| stk.push(o); |
| invokeCircularReferenceCheck((DataType) o, stk, p); |
| } |
| } |
| } |
| setChecked(true); |
| } |
| } |
| } |