/*
* @(#)ResourceBundleEnumeration.java 1.6 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package java.util;
/**
* Implements an Enumeration that combines elements from a Set and
* an Enumeration. Used by ListResourceBundle and PropertyResourceBundle.
*/
class ResourceBundleEnumeration implements Enumeration {
Set set;
Iterator iterator;
Enumeration enumeration; // may remain null
/**
* Constructs a resource bundle enumeration.
* @param set an set providing some elements of the enumeration
* @param enumeration an enumeration providing more elements of the enumeration.
* enumeration may be null.
*/
ResourceBundleEnumeration(Set set, Enumeration enumeration) {
this.set = set;
this.iterator = set.iterator();
this.enumeration = enumeration;
}
Object next = null;
public boolean hasMoreElements() {
if (next == null) {
if (iterator.hasNext()) {
next = iterator.next();
} else if (enumeration != null) {
while (next == null && enumeration.hasMoreElements()) {
next = enumeration.nextElement();
if (set.contains(next)) {
next = null;
}
}
}
}
return next != null;
}
public Object nextElement() {
if (hasMoreElements()) {
Object result = next;
next = null;
return result;
} else {
throw new NoSuchElementException();
}
}
}