Coverage report

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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   
  * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
 41   
  * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
 42   
  * @version $Id: ArrayIterator.java,v 1.3 2004/02/28 13:45:21 yoavs Exp $
 43   
  */
 44   
 public class ArrayIterator implements Iterator
 45   
 {
 46   
     /**
 47   
      * The objects to iterate.
 48   
      */
 49   
     private Object array;
 50   
 
 51   
     /**
 52   
      * The current position and size in the array.
 53   
      */
 54   
     private int pos;
 55   
     private int size;
 56   
 
 57   
     /**
 58   
      * Creates a new iterator instance for the specified array.
 59   
      *
 60   
      * @param array The array for which an iterator is desired.
 61   
      */
 62   
     public ArrayIterator(Object array)
 63  0 
     {
 64   
         /*
 65   
          * if this isn't an array, then throw.  Note that this is
 66   
          * for internal use - so this should never happen - if it does
 67   
          *  we screwed up.
 68   
          */
 69   
 
 70  0 
         if ( !array.getClass().isArray() )
 71   
         {
 72  0 
             throw new IllegalArgumentException(
 73   
                 "Programmer error : internal ArrayIterator invoked w/o array");
 74   
         }
 75   
 
 76  0 
         this.array = array;
 77  0 
         pos = 0;
 78  0 
         size = Array.getLength( this.array );
 79  0 
     }
 80   
 
 81   
     /**
 82   
      * Move to next element in the array.
 83   
      *
 84   
      * @return The next object in the array.
 85   
      */
 86   
     public Object next()
 87   
     {
 88  0 
         if (pos < size )
 89  0 
             return Array.get( array, pos++);
 90   
 
 91   
         /*
 92   
          *  we screwed up...
 93   
          */
 94   
 
 95  0 
         throw new NoSuchElementException("No more elements: " + pos +
 96   
                                          " / " + size);
 97   
     }
 98   
 
 99   
     /**
 100   
      * Check to see if there is another element in the array.
 101   
      *
 102   
      * @return Whether there is another element.
 103   
      */
 104   
     public boolean hasNext()
 105   
     {
 106  0 
         return (pos < size );
 107   
     }
 108   
 
 109   
     /**
 110   
      * No op--merely added to satify the <code>Iterator</code> interface.
 111   
      */
 112   
     public void remove()
 113   
     {
 114  0 
         throw new UnsupportedOperationException();
 115   
     }
 116   
 }

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