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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.misc; | ||
| 27 | |||
| 28 | import java.util.Enumeration; | ||
| 29 | import java.util.NoSuchElementException; | ||
| 30 | |||
| 31 | /* | ||
| 32 | * A useful utility class that will enumerate over an array of | ||
| 33 | * enumerations. | ||
| 34 | */ | ||
| 35 | public class CompoundEnumeration<E> implements Enumeration<E> { | ||
| 36 | private Enumeration[] enums; | ||
| 37 | private int index = 0; | ||
| 38 | |||
| 39 | public CompoundEnumeration(Enumeration[] enums) { | ||
| 40 | this.enums = enums; | ||
| 41 | } | ||
| 42 | |||
| 43 | private boolean next() { | ||
| 44 | while (index < enums.length) { | ||
| 45 | if (enums[index] != null && enums[index].hasMoreElements()) { | ||
| 46 | return true; | ||
| 47 | } | ||
| 48 | index++; | ||
| 49 | } | ||
| 50 | return false; | ||
| 51 | } | ||
| 52 | |||
| 53 | public boolean hasMoreElements() { | ||
| 54 | return next(); | ||
| 55 | } | ||
| 56 | |||
| 57 | public E nextElement() { | ||
| 58 | if (!next()) { | ||
| 59 | throw new NoSuchElementException(); | ||
| 60 | } | ||
| 61 | return (E)enums[index].nextElement(); | ||
| 62 | } | ||
| 63 | } | ||