jdk/src/share/classes/sun/misc/CompoundEnumeration.java
author weijun
Mon, 05 Dec 2011 10:19:13 +0800
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7116857: Warnings in javax.security and some sun.misc Reviewed-by: smarks
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/*
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 * Copyright (c) 1998, 2004, 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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}