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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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