/*
* Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code 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 code 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 in the LICENSE file that
* accompanied this code).
*
* 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 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/*
* NOTE:
*
* This class was backported from the JDK6 runtime library, because some of
* the functionality in this class aren't available on JDK5, which is at
* the moment the target JRE environment for running Visage applications.
* Once JDK5 is not a supported platform anymore, this class should be
* removed.
*/
package org.visage.runtime.util.backport;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;
/**
* Implements an Enumeration that combines elements from a Set and
* an Enumeration. Used by ListResourceBundle and PropertyResourceBundle.
*/
public class ResourceBundleEnumeration implements Enumeration<String> {
Set<String> set;
Iterator<String> iterator;
Enumeration<String> 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.
*/
public ResourceBundleEnumeration(Set<String> set, Enumeration<String> enumeration) {
this.set = set;
this.iterator = set.iterator();
this.enumeration = enumeration;
}
String 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 String nextElement() {
if (hasMoreElements()) {
String result = next;
next = null;
return result;
} else {
throw new NoSuchElementException();
}
}
}