83 lines
2.8 KiB
Java
83 lines
2.8 KiB
Java
/*
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* Copyright (c) 2001, 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.util;
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import java.util.Enumeration;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import java.util.Set;
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/**
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* Implements an Enumeration that combines elements from a Set and
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* an Enumeration. Used by ListResourceBundle and PropertyResourceBundle.
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*/
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public class ResourceBundleEnumeration implements Enumeration<String> {
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Set<String> set;
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Iterator<String> iterator;
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Enumeration<String> enumeration; // may remain null
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/**
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* Constructs a resource bundle enumeration.
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* @param set an set providing some elements of the enumeration
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* @param enumeration an enumeration providing more elements of the enumeration.
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* enumeration may be null.
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*/
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public ResourceBundleEnumeration(Set<String> set, Enumeration<String> enumeration) {
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this.set = set;
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this.iterator = set.iterator();
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this.enumeration = enumeration;
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}
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String next = null;
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public boolean hasMoreElements() {
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if (next == null) {
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if (iterator.hasNext()) {
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next = iterator.next();
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} else if (enumeration != null) {
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while (next == null && enumeration.hasMoreElements()) {
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next = enumeration.nextElement();
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if (set.contains(next)) {
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next = null;
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}
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}
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}
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}
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return next != null;
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}
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public String nextElement() {
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if (hasMoreElements()) {
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String result = next;
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next = null;
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return result;
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} else {
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throw new NoSuchElementException();
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}
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}
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}
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