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Java > Open Source Codes > jxl > biff > formula > MissingArg


1 /*********************************************************************
2 *
3 * Copyright (C) 2002 Andrew Khan
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 ***************************************************************************/
19
20 package jxl.biff.formula;
21
22 import jxl.Cell;
23 import jxl.biff.StringHelper;
24
25 /**
26  * Represents a missing argument in an argument list
27  */
28 class MissingArg extends Operand implements ParsedThing
29 {
30   /**
31    * Constructor
32    */
33   public MissingArg()
34   {
35   }
36
37   /**
38    * Reads the ptg data from the array starting at the specified position.
39    * A missing argument contains no associated data
40    *
41    * @param data the RPN array
42    * @param pos the current position in the array, excluding the ptg identifier
43    * @return the number of bytes read
44    */
45   public int read(byte[] data, int pos)
46   {
47     return 0;
48   }
49
50   /**
51    * Gets the token representation of this item in RPN
52    *
53    * @return the bytes applicable to this formula
54    */
55   byte[] getBytes()
56   {
57     byte[] data = new byte[1];
58     data[0] = Token.MISSING_ARG.getCode();
59
60     return data;
61   }
62
63   /**
64    * Abstract method implementation to get the string equivalent of this
65    * token
66    *
67    * @param buf the string to append to
68    */
69   public void getString(StringBuffer JavaDoc buf)
70   {
71   }
72 }
73
74
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