DoubleNaNHandler


1   /*
2    * ====================================================================
3    * This software is subject to the terms of the Common Public License
4    * Agreement, available at the following URL:
5    *   http://www.opensource.org/licenses/cpl.html .
6    * Copyright (C) 2003-2004 TONBELLER AG.
7    * All Rights Reserved.
8    * You must accept the terms of that agreement to use this software.
9    * ====================================================================
10   *
11   *
12   */
13  package com.tonbeller.wcf.format;
14  
15  /**
16   * Parses and formats double numbers, treating Double.NaN as empty string
17   * and vice versa
18   */
19  public class DoubleNaNHandler extends DoubleHandler {
20    /*
21     * if empty - return Double.NaN
22     */
23    public Object   parse(String   s, String   userPattern) throws FormatException {
24      if (s != null && s.length() == 0) {
25        return new Double  (Double.NaN);
26      } else {
27        return super.parse(s, userPattern);
28      }
29    }
30  
31    /*
32     * if Double.NaN, return empty instead of ?
33     */
34    public String   format(Object   o, String   userPattern) {
35      if (o instanceof Double   && Double.isNaN(((Double  )o).doubleValue())) {
36        return "";
37      } else {
38        return super.format(o, userPattern);
39      }
40    }
41  }
42

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