KickJava   Java API By Example, From Geeks To Geeks.

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


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.DoubleHelper;
24
25 /**
26  * A boolean operand in a formula
27  */
28 class BooleanValue extends Operand implements ParsedThing
29 {
30   /**
31    * The boolean value
32    */
33   private boolean value;
34
35   /**
36    * Constructor
37    */
38   public BooleanValue()
39   {
40   }
41
42   /**
43    * Constructor used when parsing a string formula
44    *
45    * @param s the string token, including quote marks
46    */
47   public BooleanValue(String JavaDoc s)
48   {
49     // remove the quotes
50 value = Boolean.valueOf(s).booleanValue();
51   }
52
53
54   /**
55    * Reads the ptg data from the array starting at the specified position
56    *
57    * @param data the RPN array
58    * @param pos the current position in the array, excluding the ptg identifier
59    * @return the number of bytes read
60    */
61   public int read(byte[] data, int pos)
62   {
63     value = data[pos] == 1 ? true : false;
64     return 1;
65   }
66
67   /**
68    * Gets the token representation of this item in RPN
69    *
70    * @return the bytes applicable to this formula
71    */
72   byte[] getBytes()
73   {
74     byte[] data = new byte[2];
75     data[0] = Token.BOOL.getCode();
76     data[1] = (byte) (value == true ? 1 : 0);
77
78     return data;
79   }
80
81   /**
82    * Abstract method implementation to get the string equivalent of this
83    * token
84    *
85    * @param buf the string to append to
86    */
87   public void getString(StringBuffer JavaDoc buf)
88   {
89     buf.append((new Boolean JavaDoc(value)).toString());
90   }
91 }
92
Popular Tags