62 lines
1.5 KiB
Java
62 lines
1.5 KiB
Java
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/*******************************************************************************
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* Copyright (c) 2002 - 2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.util.collections;
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import java.util.ArrayList;
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import java.util.Iterator;
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import com.ibm.wala.util.debug.Assertions;
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/**
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*
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* An iterator that reverses an input iterator.
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* Not very efficient.
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*
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* @author sfink
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*/
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public class ReverseIterator<T> implements Iterator<T> {
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final ArrayList<T> list = new ArrayList<T>();
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int nextIndex;
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/**
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* @param other the iterator to reverse
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*/
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public ReverseIterator(Iterator<T> other) {
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while (other.hasNext()) {
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list.add(other.next());
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}
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nextIndex = list.size() - 1;
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}
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/* (non-Javadoc)
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* @see java.util.Iterator#hasNext()
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*/
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public boolean hasNext() {
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return nextIndex > -1;
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}
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/* (non-Javadoc)
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* @see java.util.Iterator#next()
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*/
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public T next() {
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return list.get(nextIndex--);
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}
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/* (non-Javadoc)
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* @see java.util.Iterator#remove()
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*/
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public void remove() {
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Assertions.UNREACHABLE();
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}
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}
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