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Ant example source code file (

This example Ant source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

baseresourcecollectionwrapper, delegatedresourcecomparator, iterator, iterator, mutableint, mutableint, myiterator, object, project, resourcecollection, sortedbag, sortedbag, treemap, treemap, util

The source code

 *  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
 *  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.

import java.util.Stack;
import java.util.TreeMap;
import java.util.Iterator;
import java.util.Collection;
import java.util.Comparator;
import java.util.Collections;
import java.util.AbstractCollection;
import java.util.NoSuchElementException;


 * ResourceCollection that sorts another ResourceCollection.
 * @since Ant 1.7
public class Sort extends BaseResourceCollectionWrapper {

    //sorted bag impl. borrowed from commons-collections TreeBag:
    private static class SortedBag extends AbstractCollection {
        private class MutableInt {
            private int value = 0;
        private class MyIterator implements Iterator {
            private Iterator keyIter = t.keySet().iterator();
            private Object current;
            private int occurrence;
            public synchronized boolean hasNext() {
                return occurrence > 0 || keyIter.hasNext();
            public synchronized Object next() {
                if (!hasNext()) {
                    throw new NoSuchElementException();
                if (occurrence == 0) {
                    current =;
                    occurrence = ((MutableInt) t.get(current)).value;
                return current;
            public void remove() {
                throw new UnsupportedOperationException();
        private TreeMap t;
        private int size;

        SortedBag(Comparator c) {
            t = new TreeMap(c);
        public synchronized Iterator iterator() {
            return new MyIterator();
        public synchronized boolean add(Object o) {
            if (size < Integer.MAX_VALUE) {
            MutableInt m = (MutableInt) (t.get(o));
            if (m == null) {
                m = new MutableInt();
                t.put(o, m);
            return true;
        public synchronized int size() {
            return size;

    private DelegatedResourceComparator comp = new DelegatedResourceComparator();

     * Sort the contained elements.
     * @return a Collection of Resources.
    protected synchronized Collection getCollection() {
        ResourceCollection rc = getResourceCollection();
        Iterator iter = rc.iterator();
        if (!(iter.hasNext())) {
            return Collections.EMPTY_SET;
        SortedBag b = new SortedBag(comp);
        while (iter.hasNext()) {
        return b;

     * 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();

     * 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 stk, Project p)
        throws BuildException {
        if (isChecked()) {
        if (isReference()) {
            super.dieOnCircularReference(stk, p);
        } else {
            DataType.invokeCircularReferenceCheck(comp, stk, p);


Other Ant examples (source code examples)

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