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/*
* 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;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
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;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.types.resources.comparators.DelegatedResourceComparator;
import org.apache.tools.ant.types.resources.comparators.ResourceComparator;
import org.apache.tools.ant.util.CollectionUtils;
/**
* ResourceCollection that sorts another ResourceCollection.
*
* Note that Sort must not be used in cases where the ordering of the objects
* being sorted might change during the sorting process.
*
* @since Ant 1.7
*/
public class Sort extends BaseResourceCollectionWrapper {
private DelegatedResourceComparator comp = new DelegatedResourceComparator();
/**
* Sort the contained elements.
* @return a Collection of Resources.
*/
protected synchronized Collection<Resource> getCollection() {
ResourceCollection rc = getResourceCollection();
Iterator<Resource> iter = rc.iterator();
if (!(iter.hasNext())) {
return Collections.emptySet();
}
List<Resource> result = (List<Resource>) CollectionUtils.asCollection(iter);
Collections.sort(result, comp);
return result;
}
/**
* Add a ResourceComparator to this Sort ResourceCollection.
* If multiple ResourceComparators are added, they will be processed in LIFO order.
* @param c the ResourceComparator to add.
*/
public synchronized void add(ResourceComparator c) {
if (isReference()) {
throw noChildrenAllowed();
}
comp.add(c);
FailFast.invalidate(this);
setChecked(false);
}
/**
* Overrides the BaseResourceCollectionContainer version
* to recurse on nested ResourceComparators.
* @param stk the stack of data types to use (recursively).
* @param p the project to use to dereference the references.
* @throws BuildException on error.
*/
protected synchronized void dieOnCircularReference(Stack<Object> stk, Project p)
throws BuildException {
if (isChecked()) {
return;
}
// check nested collection
super.dieOnCircularReference(stk, p);
if (!isReference()) {
DataType.pushAndInvokeCircularReferenceCheck(comp, stk, p);
setChecked(true);
}
}
}
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