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| org.apache.commons.jexl.util.ArrayIterator |
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| 1 | /* |
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| 2 | * Copyright 1999-2001,2004 The Apache Software Foundation. |
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| 3 | * |
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | * you may not use this file except in compliance with the License. |
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| 6 | * You may obtain a copy of the License at |
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| 7 | * |
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | * |
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| 10 | * Unless required by applicable law or agreed to in writing, software |
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | * See the License for the specific language governing permissions and |
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| 14 | * limitations under the License. |
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| 15 | */ |
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| 16 | ||
| 17 | package org.apache.commons.jexl.util; |
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| 18 | ||
| 19 | ||
| 20 | ||
| 21 | import java.util.Iterator; |
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| 22 | import java.util.NoSuchElementException; |
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| 23 | import java.lang.reflect.Array; |
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| 24 | ||
| 25 | ||
| 26 | /** |
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| 27 | * <p> |
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| 28 | * An Iterator wrapper for an Object[]. This will |
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| 29 | * allow us to deal with all array like structures |
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| 30 | * in a consistent manner. |
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| 31 | * </p> |
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| 32 | * <p> |
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| 33 | * WARNING : this class's operations are NOT synchronized. |
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| 34 | * It is meant to be used in a single thread, newly created |
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| 35 | * for each use in the #foreach() directive. |
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| 36 | * If this is used or shared, synchronize in the |
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| 37 | * next() method. |
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| 38 | * </p> |
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| 39 | * |
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| 40 | * @since 1.0 |
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| 41 | * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> |
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| 42 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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| 43 | * @version $Id: ArrayIterator.java 398329 2006-04-30 12:51:43Z dion $ |
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| 44 | */ |
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| 45 | public class ArrayIterator implements Iterator { |
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| 46 | /** |
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| 47 | * The objects to iterate over. |
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| 48 | */ |
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| 49 | private final Object array; |
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| 50 | ||
| 51 | /** |
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| 52 | * The current position and size in the array. |
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| 53 | */ |
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| 54 | private int pos; |
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| 55 | ||
| 56 | /** |
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| 57 | * The size of the array. |
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| 58 | */ |
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| 59 | private final int size; |
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| 60 | ||
| 61 | /** |
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| 62 | * Creates a new iterator instance for the specified array. |
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| 63 | * |
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| 64 | * @param arr The array for which an iterator is desired. |
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| 65 | */ |
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| 66 | 2 | public ArrayIterator(Object arr) { |
| 67 | /* |
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| 68 | * if this isn't an array, then throw. Note that this is |
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| 69 | * for internal use - so this should never happen - if it does |
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| 70 | * we screwed up. |
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| 71 | */ |
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| 72 | ||
| 73 | 2 | if (!arr.getClass().isArray()) { |
| 74 | 0 | throw new IllegalArgumentException("Programmer error :" |
| 75 | + " internal ArrayIterator invoked w/o array"); |
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| 76 | } |
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| 77 | ||
| 78 | 2 | array = arr; |
| 79 | 2 | pos = 0; |
| 80 | 2 | size = Array.getLength(array); |
| 81 | 2 | } |
| 82 | ||
| 83 | /** |
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| 84 | * Move to next element in the array. |
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| 85 | * |
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| 86 | * @return The next object in the array. |
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| 87 | */ |
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| 88 | public Object next() { |
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| 89 | 4 | if (pos < size) { |
| 90 | 4 | return Array.get(array, pos++); |
| 91 | } |
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| 92 | ||
| 93 | /* |
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| 94 | * we screwed up... |
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| 95 | */ |
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| 96 | ||
| 97 | 0 | throw new NoSuchElementException("No more elements: " + pos |
| 98 | + " / " + size); |
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| 99 | } |
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| 100 | ||
| 101 | /** |
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| 102 | * Check to see if there is another element in the array. |
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| 103 | * |
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| 104 | * @return Whether there is another element. |
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| 105 | */ |
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| 106 | public boolean hasNext() { |
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| 107 | 6 | return (pos < size); |
| 108 | } |
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| 109 | ||
| 110 | /** |
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| 111 | * No op--merely added to satify the <code>Iterator</code> interface. |
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| 112 | */ |
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| 113 | public void remove() { |
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| 114 | 0 | throw new UnsupportedOperationException(); |
| 115 | } |
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| 116 | } |
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