author | jlahoda |
Wed, 01 Jul 2015 09:51:48 +0200 | |
changeset 31506 | 4e07f827a794 |
child 34752 | 9c262a013456 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 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 com.sun.tools.javac.util; |
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import java.util.Iterator; |
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import java.util.NoSuchElementException; |
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import java.util.function.Function; |
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/** Utilities for Iterators. |
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* |
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* <p><b>This is NOT part of any supported API. |
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* If you write code that depends on this, you do so at your own risk. |
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* This code and its internal interfaces are subject to change or |
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* deletion without notice.</b> |
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*/ |
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public class Iterators { |
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public static <I, O> Iterator<O> createCompoundIterator(Iterable<I> inputs, Function<I, Iterator<O>> convertor) { |
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return new CompoundIterator<>(inputs, convertor); |
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} |
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private static class CompoundIterator<I, O> implements Iterator<O> { |
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private final Iterator<I> inputs; |
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private final Function<I, Iterator<O>> convertor; |
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private Iterator<O> currentIterator; |
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public CompoundIterator(Iterable<I> inputs, Function<I, Iterator<O>> convertor) { |
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this.inputs = inputs.iterator(); |
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this.convertor = convertor; |
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} |
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public boolean hasNext() { |
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while (inputs.hasNext() && (currentIterator == null || !currentIterator.hasNext())) { |
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currentIterator = convertor.apply(inputs.next()); |
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} |
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return currentIterator != null && currentIterator.hasNext(); |
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} |
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public O next() { |
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if (!hasNext()) |
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throw new NoSuchElementException(); |
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return currentIterator.next(); |
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} |
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public void remove() { |
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throw new UnsupportedOperationException(); |
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} |
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} |
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} |