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/**
* $Revision: 691 $
* $Date: 2004-12-13 15:06:54 -0300 (Mon, 13 Dec 2004) $
*
* Copyright (C) 2004-2006 Jive Software. All rights reserved.
*
* This software is published under the terms of the GNU Public License (GPL),
* a copy of which is included in this distribution.
*/
package org.jivesoftware.openfire.group;
import java.util.AbstractCollection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Collection;
/**
* Provides a view of an array of group names as a Collection of Group objects. If
* any of the group names cannot be loaded, they are transparently skipped when
* iterating over the collection.
*
* @author Matt Tucker
*/
public class GroupCollection extends AbstractCollection {
private String[] elements;
/**
* Constructs a new GroupCollection.
*/
public GroupCollection(Collection<String> collection) {
this.elements = collection.toArray(new String[collection.size()]);
}
/**
* Constructs a new GroupCollection.
*/
public GroupCollection(String [] elements) {
this.elements = elements;
}
public Iterator iterator() {
return new UserIterator();
}
public int size() {
return elements.length;
}
private class UserIterator implements Iterator {
private int currentIndex = -1;
private Object nextElement = null;
public boolean hasNext() {
// If we are at the end of the list, there can't be any more elements
// to iterate through.
if (currentIndex + 1 >= elements.length && nextElement == null) {
return false;
}
// Otherwise, see if nextElement is null. If so, try to load the next
// element to make sure it exists.
if (nextElement == null) {
nextElement = getNextElement();
if (nextElement == null) {
return false;
}
}
return true;
}
public Object next() throws java.util.NoSuchElementException {
Object element;
if (nextElement != null) {
element = nextElement;
nextElement = null;
}
else {
element = getNextElement();
if (element == null) {
throw new NoSuchElementException();
}
}
return element;
}
public void remove() throws UnsupportedOperationException {
throw new UnsupportedOperationException();
}
/**
* Returns the next available element, or null if there are no more elements to return.
*
* @return the next available element.
*/
private Object getNextElement() {
while (currentIndex + 1 < elements.length) {
currentIndex++;
Object element = null;
try {
element = GroupManager.getInstance().getGroup(elements[currentIndex]);
}
catch (GroupNotFoundException unfe) {
// Ignore.
}
if (element != null) {
return element;
}
}
return null;
}
}
}