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Java > Open Source Codes > jxl > read > biff > RKHelper


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.read.biff;
21
22 /**
23  * Helper to convert an RK number into a double or an integer
24  */
25 final class RKHelper
26 {
27   /**
28    * Private constructor to prevent instantiation
29    */
30   private RKHelper()
31   {
32   }
33
34   /**
35    * Converts excel's internal RK format into a double value
36    *
37    * @param rk the rk number in bits
38    * @return the double representation
39    */
40   public static double getDouble(int rk)
41   {
42     if ((rk & 0x02) != 0)
43     {
44       int intval = rk >> 2;
45
46       double value = (double) intval;
47       if ((rk & 0x01) != 0)
48       {
49         value /= 100;
50       }
51
52       return value;
53     }
54     else
55     {
56       long valbits = (rk & 0xfffffffc);
57       valbits <<= 32;
58       double value = Double.longBitsToDouble(valbits);
59
60       if ((rk & 0x01) != 0)
61       {
62         value /= 100;
63       }
64
65       return value;
66     }
67   }
68 }
69
70
71
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