94 lines
2.5 KiB
Java
94 lines
2.5 KiB
Java
/*******************************************************************************
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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.Iterator;
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import java.util.NoSuchElementException;
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/**
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* an Iterator of array elements
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*/
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public class ArrayIterator<T> implements Iterator<T> {
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/**
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* The index of the next array element to return
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*/
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protected int _cnt;
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/**
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* The index of the last array element to return
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*/
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protected final int last;
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/**
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* The array source for the iterator
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*/
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protected final T[] _elts;
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/**
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* @param elts the array which should be iterated over
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*/
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public ArrayIterator(T[] elts) {
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this(elts, 0);
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}
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/**
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* @param elts the array which should be iterated over
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* @param start the first array index to return
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*/
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public ArrayIterator(T[] elts, int start) {
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if (elts == null) {
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throw new IllegalArgumentException("null elts");
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}
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if (start < 0 || start > elts.length) {
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throw new IllegalArgumentException("invalid start: " + start + ", arrray length " + elts.length);
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}
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_elts = elts;
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_cnt = start;
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last = _elts.length - 1;
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}
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/**
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* @param elts the array which should be iterated over
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* @param start the first array index to return
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*/
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public ArrayIterator(T[] elts, int start, int last) {
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if (elts == null) {
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throw new IllegalArgumentException("null elts");
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}
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if (start < 0) {
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throw new IllegalArgumentException("illegal start: " + start);
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}
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if (last < 0) {
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throw new IllegalArgumentException("illegal last: " + last);
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}
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_elts = elts;
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_cnt = start;
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this.last = last;
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}
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public boolean hasNext() {
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return _cnt <= last;
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}
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public T next() throws NoSuchElementException {
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if (_cnt >= _elts.length) {
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throw new NoSuchElementException();
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}
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return _elts[_cnt++];
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}
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public void remove() throws UnsupportedOperationException {
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throw new UnsupportedOperationException();
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}
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}
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