ItemAt


1   // Copyright (c) 2001  Per M.A. Bothner and Brainfood Inc.
2   // This is free software;  for terms and warranty disclaimer see ./COPYING.
3   
4   package gnu.xquery.util;
5   import gnu.mapping.*;
6   
7   /** Returns a value at a given index in a sequence of values.
8    * Implements XQuery 'item-at'. */
9   
10  public class ItemAt extends Procedure2
11  {
12    public static final ItemAt itemAt = new ItemAt();
13  
14    static public Object   itemAt (Object   seq, int index)
15    {
16      if (seq instanceof Values)
17        {
18      Values vals = (Values) seq;
19      if (vals.isEmpty())
20        return Values.empty;
21      return vals.get(index - 1);
22        }
23      else
24        {
25      if (index != 1)
26        throw new IndexOutOfBoundsException  ();
27      return seq;
28        }
29    }
30  
31    public Object   apply2(Object   arg1, Object   arg2)
32    {
33      return itemAt(arg1, ((Number  ) arg2).intValue());
34    }
35  }
36

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