FormatEditor


1   /*
2     Copyright (C) 2003 Laurent Martelli <laurent@aopsys.com>
3     
4     This program is free software; you can redistribute it and/or modify
5     it under the terms of the GNU Lesser General Public License as
6     published by the Free Software Foundation; either version 2 of the
7     License, or (at your option) any later version.
8   
9     This program is distributed in the hope that it will be useful, but
10    WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    Lesser General Public License for more details.
13  
14    You should have received a copy of the GNU Lesser General Public
15    License along with this program; if not, write to the Free Software
16    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
17    USA */
18  
19  package org.objectweb.jac.aspects.gui.web;
20  
21  import java.io.PrintWriter  ;
22  import java.text.ParsePosition  ;
23  import org.objectweb.jac.aspects.gui.FloatFormat;
24  import org.objectweb.jac.core.rtti.FieldItem;
25  import org.objectweb.jac.aspects.gui.Format;
26  
27  /**
28   * HTML editor and viewer for percentage values. It can handle short,
29   * int, long, float, and double. In the case of short, int and long,
30   * the percentage value is considered to be between 0 and 100, while
31   * in the case of float and double it must be between 0 and 1.
32   */
33  public abstract class FormatEditor extends AbstractFieldEditor 
34      implements HTMLEditor
35  {
36      public FormatEditor(Object   substance, FieldItem field) {
37          super(substance,field);
38          initFormat(field);
39      }
40  
41      /** Stores the default format of the float */
42      protected Format format;
43  
44      protected abstract void initFormat(FieldItem field);
45  
46      public void setField(FieldItem field) {
47          super.setField(field);
48          initFormat(field);
49      }
50  
51      // HTMLEditor interface
52  
53      public void genHTML(PrintWriter   out) {
54          out.print("<input type=\"text\" name=\""+label+"\""+sizeSpec()+
55                    " value=\""+(value!=null?(format.format(value)):"")+"\"");
56          printAttributes(out);
57          out.println(">");
58      }
59  
60      protected boolean doReadValue(Object   parameter) {
61          if (parameter==null)
62              return false;
63          Object   parsedValue = parse((String  )parameter);
64          if (parsedValue==null) {
65              return false;
66          } else {
67              setValue(parsedValue);
68              return true;
69          }
70      }
71  
72      protected Object   parse(String   s) {
73          ParsePosition   pos = new ParsePosition  (0);
74          return format.parse(s,pos);        
75      }
76  }
77  
78
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