1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.runtime.arrays;
  27 
  28 import java.lang.reflect.Array;
  29 
  30 /**
  31   * Iterator over a Java List.
  32  */
  33 class JavaArrayIterator extends ArrayLikeIterator<Object> {
  34 
  35     /** Array to iterate over */
  36     protected final Object array;
  37 
  38     /** length of array */
  39     protected final long length;
  40 
  41     /**
  42      * Constructor
  43      * @param array array to iterate over
  44      * @param includeUndefined should undefined elements be included in iteration
  45      */
  46     protected JavaArrayIterator(final Object array, final boolean includeUndefined) {
  47         super(includeUndefined);
  48         assert array.getClass().isArray() : "expecting Java array object";
  49         this.array = array;
  50         this.length = Array.getLength(array);
  51     }
  52 
  53     /**
  54      * Is the current index still inside the array
  55      * @return true if inside the array
  56      */
  57     protected boolean indexInArray() {
  58         return index < length;
  59     }
  60 
  61     @Override
  62     public Object next() {
  63         return Array.get(array, (int)bumpIndex());
  64     }
  65 
  66     @Override
  67     public long getLength() {
  68         return length;
  69     }
  70 
  71     @Override
  72     public boolean hasNext() {
  73         return indexInArray();
  74     }
  75 
  76     @Override
  77     public void remove() {
  78         throw new UnsupportedOperationException("remove");
  79     }
  80 }