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