odk/examples/DevelopersGuide/Forms/DateValidator.java

   1 /*************************************************************************
   2  *
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * Copyright 2008 by Sun Microsystems, Inc.
   6  *
   7  * OpenOffice.org - a multi-platform office productivity suite
   8  *
   9  * $RCSfile: DateValidator.java,v $
  10  * $Revision: 1.5 $
  11  *
  12  * This file is part of OpenOffice.org.
  13  *
  14  * OpenOffice.org is free software: you can redistribute it and/or modify
  15  * it under the terms of the GNU Lesser General Public License version 3
  16  * only, as published by the Free Software Foundation.
  17  *
  18  * OpenOffice.org is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU Lesser General Public License version 3 for more details
  22  * (a copy is included in the LICENSE file that accompanied this code).
  23  *
  24  * You should have received a copy of the GNU Lesser General Public License
  25  * version 3 along with OpenOffice.org.  If not, see
  26  * <http://www.openoffice.org/license.html>
  27  * for a copy of the LGPLv3 License.
  28  *
  29  ************************************************************************/
  30
  31 import com.sun.star.form.binding.*;
  32
  33 /**
  34  *
  35  * @author  fs@openoffice.org
  36  */
  37 public class DateValidator extends ControlValidator
  38 {
  39
  40     /** Creates a new instance of NumericValidator */
  41     public DateValidator( )
  42     {
  43     }
  44
  45     public String explainInvalid( Object Value )
  46     {
  47         try
  48         {
  49             if ( isVoid( Value ) )
  50                 return "empty input";
  51
  52             com.sun.star.util.Date dateValue = (com.sun.star.util.Date)Value;
  53             if ( isDedicatedInvalidDate( dateValue ) )
  54                 return "this is no valid date";
  55
  56             if ( !isNextMonthsDate( dateValue ) )
  57                 return "date must denote a day in the current month";
  58         }
  59         catch( java.lang.Exception e )
  60         {
  61             return "oops. What did you enter for this to happen?";
  62         }
  63         return "";
  64     }
  65
  66     public boolean isValid( Object Value )
  67     {
  68         try
  69         {
  70             if ( isVoid( Value ) )
  71                 return false;
  72
  73             com.sun.star.util.Date dateValue = (com.sun.star.util.Date)
  74                 com.sun.star.uno.AnyConverter.toObject(
  75                     com.sun.star.util.Date.class, Value);
  76             if ( isDedicatedInvalidDate( dateValue ) )
  77                 return false;
  78
  79             if ( !isNextMonthsDate( dateValue ) )
  80                 return false;
  81             return true;
  82         }
  83         catch( java.lang.Exception e )
  84         {
  85             e.printStackTrace( System.err );
  86         }
  87         return false;
  88     }
  89
  90     private boolean isDedicatedInvalidDate( com.sun.star.util.Date dateValue )
  91     {
  92         return ( dateValue.Day == 0 ) && ( dateValue.Month == 0 ) && ( dateValue.Year == 0 );
  93     }
  94
  95     private boolean isNextMonthsDate( com.sun.star.util.Date dateValue )
  96     {
  97         int overallMonth = dateValue.Year * 12 + dateValue.Month - 1;
  98
  99         int todaysMonth = new java.util.Date().getMonth();
 100         int todaysYear = new java.util.Date().getYear() + 1900;
 101         int todaysOverallMonth = todaysYear * 12 + todaysMonth;
 102
 103         return overallMonth == todaysOverallMonth;
 104     }
 105 }