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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.Iterator;
import java.util.ArrayList;
import java.util.Collection;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.types.resources.selectors.ResourceSelector;
import org.apache.tools.ant.types.resources.selectors.ResourceSelectorContainer;
/**
* ResourceCollection that allows a number of selectors to be
* applied to a single ResourceCollection for the purposes of
* restricting or narrowing results.
* @since Ant 1.7
*/
public class Restrict
extends ResourceSelectorContainer implements ResourceCollection {
private BaseResourceCollectionWrapper w = new BaseResourceCollectionWrapper() {
/**
* Restrict the nested ResourceCollection based on the nested selectors.
* @return a Collection of Resources.
*/
protected Collection getCollection() {
ArrayList result = new ArrayList();
outer: for (Iterator ri = w.getResourceCollection().iterator(); ri.hasNext();) {
Resource r = (Resource) ri.next();
for (Iterator i = getSelectors(); i.hasNext();) {
if (!((ResourceSelector) (i.next())).isSelected(r)) {
continue outer;
}
}
result.add(r);
}
return result;
}
};
/**
* Add the ResourceCollection.
* @param c the ResourceCollection to add.
*/
public synchronized void add(ResourceCollection c) {
if (isReference()) {
throw noChildrenAllowed();
}
w.add(c);
}
/**
* Set whether to cache collections.
* @param b boolean cache flag.
*/
public synchronized void setCache(boolean b) {
w.setCache(b);
}
/**
* Learn whether to cache collections. Default is <code>true</code>.
* @return boolean cache flag.
*/
public synchronized boolean isCache() {
return w.isCache();
}
/**
* Add a ResourceSelector.
* @param s the ResourceSelector to add.
*/
public synchronized void add(ResourceSelector s) {
if (s == null) {
return;
}
super.add(s);
FailFast.invalidate(this);
}
/**
* Fulfill the ResourceCollection contract.
* @return an Iterator of Resources.
*/
public final synchronized Iterator iterator() {
if (isReference()) {
return ((Restrict) getCheckedRef()).iterator();
}
dieOnCircularReference();
return w.iterator();
}
/**
* Fulfill the ResourceCollection contract.
* @return number of elements as int.
*/
public synchronized int size() {
if (isReference()) {
return ((Restrict) getCheckedRef()).size();
}
dieOnCircularReference();
return w.size();
}
/**
* Fulfill the ResourceCollection contract.
* @return whether this is a filesystem-only resource collection.
*/
public synchronized boolean isFilesystemOnly() {
if (isReference()) {
return ((Restrict) getCheckedRef()).isFilesystemOnly();
}
dieOnCircularReference();
return w.isFilesystemOnly();
}
/**
* Format this Restrict collection as a String.
* @return the String value of this collection.
*/
public synchronized String toString() {
if (isReference()) {
return getCheckedRef().toString();
}
dieOnCircularReference();
return w.toString();
}
}
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