64 lines
2.0 KiB
Java
64 lines
2.0 KiB
Java
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/*
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* Copyright (c) 1998, 2011, 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.misc;
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import java.util.Enumeration;
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import java.util.NoSuchElementException;
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/*
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* A useful utility class that will enumerate over an array of
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* enumerations.
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*/
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public class CompoundEnumeration<E> implements Enumeration<E> {
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private Enumeration<E>[] enums;
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private int index = 0;
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public CompoundEnumeration(Enumeration<E>[] enums) {
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this.enums = enums;
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}
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private boolean next() {
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while (index < enums.length) {
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if (enums[index] != null && enums[index].hasMoreElements()) {
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return true;
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}
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index++;
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}
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return false;
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}
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public boolean hasMoreElements() {
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return next();
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}
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public E nextElement() {
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if (!next()) {
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throw new NoSuchElementException();
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}
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return enums[index].nextElement();
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}
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}
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