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Ant example source code file (Sort.java)
The Sort.java 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 * * 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.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; import org.apache.tools.ant.Project; import org.apache.tools.ant.BuildException; import org.apache.tools.ant.types.DataType; import org.apache.tools.ant.types.ResourceCollection; import org.apache.tools.ant.types.resources.comparators.ResourceComparator; import org.apache.tools.ant.types.resources.comparators.DelegatedResourceComparator; /** * 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 = keyIter.next(); occurrence = ((MutableInt) t.get(current)).value; } --occurrence; 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) { ++size; } MutableInt m = (MutableInt) (t.get(o)); if (m == null) { m = new MutableInt(); t.put(o, m); } m.value++; 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()) { b.add(iter.next()); } 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(); } comp.add(c); FailFast.invalidate(this); } /** * 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()) { return; } if (isReference()) { super.dieOnCircularReference(stk, p); } else { DataType.invokeCircularReferenceCheck(comp, stk, p); setChecked(true); } } } Other Ant examples (source code examples)Here is a short list of links related to this Ant Sort.java source code file: |
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