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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.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
/**
* ResourceCollection representing the union of multiple nested ResourceCollections.
* @since Ant 1.7
*/
public class Union extends BaseResourceCollectionContainer {
/**
* Static convenience method to union an arbitrary set of Resources.
* @param rc a ResourceCollection.
* @return a Union.
*/
public static Union getInstance(ResourceCollection rc) {
return rc instanceof Union ? (Union) rc : new Union(rc);
}
/**
* Default constructor.
*/
public Union() {
}
/**
* Create a new Union.
* @param project owning Project
*/
public Union(Project project) {
super(project);
}
/**
* Convenience constructor.
* @param rc the ResourceCollection to add.
*/
public Union(ResourceCollection rc) {
this(Project.getProject(rc), rc);
}
/**
* Convenience constructor.
* @param project owning Project
* @param rc the ResourceCollection to add.
*/
public Union(Project project, ResourceCollection rc) {
super(project);
add(rc);
}
/**
* Returns all Resources in String format. Provided for
* convenience in implementing Path.
* @return String array of Resources.
*/
public String[] list() {
if (isReference()) {
return getCheckedRef(Union.class, getDataTypeName()).list();
}
final Collection<String> result = getAllToStrings();
return result.toArray(new String[result.size()]);
}
/**
* Convenience method.
* @return Resource[]
*/
public Resource[] listResources() {
if (isReference()) {
return getCheckedRef(Union.class, getDataTypeName()).listResources();
}
final Collection<Resource> result = getAllResources();
return result.toArray(new Resource[result.size()]);
}
/**
* Unify the contained Resources.
* @return a Collection of Resources.
*/
protected Collection<Resource> getCollection() {
return getAllResources();
}
/**
* Unify the contained Resources.
* @param asString indicates whether the resulting Collection
* should contain Strings instead of Resources.
* @return a Collection of Resources.
*/
@Deprecated
@SuppressWarnings("unchecked")
protected <T> Collection<T> getCollection(boolean asString) { // TODO untypable
return asString ? (Collection<T>) getAllToStrings() : (Collection<T>) getAllResources();
}
/**
* Get a collection of strings representing the unified resource set (strings may duplicate).
* @return Collection<String>
*/
protected Collection<String> getAllToStrings() {
final Set<Resource> allResources = getAllResources();
final ArrayList<String> result = new ArrayList<String>(allResources.size());
for (Resource r : allResources) {
result.add(r.toString());
}
return result;
}
/**
* Get the unified set of contained Resources.
* @return Set<Resource>
*/
protected Set<Resource> getAllResources() {
final List<ResourceCollection> resourceCollections = getResourceCollections();
if (resourceCollections.isEmpty()) {
return Collections.emptySet();
}
final LinkedHashSet<Resource> result = new LinkedHashSet<Resource>(
resourceCollections.size() * 2);
for (ResourceCollection resourceCollection : resourceCollections) {
for (Resource r : resourceCollection) {
result.add(r);
}
}
return result;
}
}
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