/*
* @(#)ResourceBundleEnumeration.java 1.3 03/01/23
*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package instrumented.java.util;
import java.util.Enumeration;
/**
* 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();
}
}
}