| /* |
| * 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 |
| * |
| * https://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.Comparator; |
| import java.util.List; |
| import java.util.Stack; |
| import java.util.Vector; |
| |
| 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 List<ResourceComparator> resourceComparators = 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; |
| } |
| resourceComparators = (resourceComparators == null) ? new Vector<>() : resourceComparators; |
| resourceComparators.add(c); |
| setChecked(false); |
| } |
| |
| /** |
| * Equality method based on the vector of resources, |
| * or if a reference, the referred to object. |
| * @param o the object to check against. |
| * @return true if there is equality. |
| */ |
| @Override |
| public synchronized boolean equals(Object o) { |
| if (o == this) { |
| return true; |
| } |
| if (isReference()) { |
| return getCheckedRef(DelegatedResourceComparator.class).equals(o); |
| } |
| if (o instanceof DelegatedResourceComparator) { |
| List<ResourceComparator> ov = ((DelegatedResourceComparator) o).resourceComparators; |
| return resourceComparators == null ? ov == null : resourceComparators.equals(ov); |
| } |
| return false; |
| } |
| |
| /** |
| * Hashcode based on the rules for equality. |
| * @return a hashcode. |
| */ |
| @Override |
| public synchronized int hashCode() { |
| if (isReference()) { |
| return getCheckedRef(DelegatedResourceComparator.class).hashCode(); |
| } |
| return resourceComparators == null ? 0 : resourceComparators.hashCode(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected synchronized int resourceCompare(Resource foo, Resource bar) { |
| return composite(resourceComparators).compare(foo, bar); |
| } |
| |
| /** |
| * 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. |
| */ |
| @Override |
| protected void dieOnCircularReference(Stack<Object> stk, Project p) |
| throws BuildException { |
| if (isChecked()) { |
| return; |
| } |
| if (isReference()) { |
| super.dieOnCircularReference(stk, p); |
| } else { |
| if (resourceComparators != null && !resourceComparators.isEmpty()) { |
| for (ResourceComparator resourceComparator : resourceComparators) { |
| if (resourceComparator instanceof DataType) { |
| pushAndInvokeCircularReferenceCheck(resourceComparator, stk, p); |
| } |
| } |
| } |
| setChecked(true); |
| } |
| } |
| |
| private static Comparator<Resource> composite(List<? extends Comparator<Resource>> foo) { |
| Comparator<Resource> result = null; |
| if (foo != null) { |
| for (Comparator<Resource> comparator : foo) { |
| if (result == null) { |
| result = comparator; |
| continue; |
| } |
| result = result.thenComparing(comparator); |
| } |
| } |
| return result == null ? Comparator.naturalOrder() : result; |
| } |
| } |