package org.python.util;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Iterator;

import java.util.List;

import java.util.Set;

import org.apache.tools.ant.types.Resource;

import org.apache.tools.ant.types.ResourceCollection;

import org.apache.tools.ant.types.resources.BaseResourceCollectionContainer;

/**

* Unions several resource collections by the name of their contained resources.

*/

public class NameUnionAntType extends BaseResourceCollectionContainer {

@SuppressWarnings("unchecked")

@Override

protected Collection<Resource> getCollection() {

List<ResourceCollection> collections = getResourceCollections();

// preserve order-encountered using a list; keep track of the items with a set

Set<String> seenNames = Generic.set();

List<Resource> union = new ArrayList();

for (ResourceCollection rc : collections) {

for (Iterator<Resource> resources = rc.iterator(); resources.hasNext();) {

Resource r = resources.next();

if (seenNames.add(r.getName())) {

union.add(r);

}

}

}

return union;

}

}