odk/examples/DevelopersGuide/Forms/DateValidator.java

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18
  19
  20 public class DateValidator extends ControlValidator
  21 {
  22
  23     /** Creates a new instance of NumericValidator */
  24     public DateValidator( )
  25     {
  26     }
  27
  28     public String explainInvalid( Object Value )
  29     {
  30         try
  31         {
  32             if ( isVoid( Value ) )
  33                 return "empty input";
  34
  35             com.sun.star.util.Date dateValue = (com.sun.star.util.Date)Value;
  36             if ( isDedicatedInvalidDate( dateValue ) )
  37                 return "this is no valid date";
  38
  39             if ( !isNextMonthsDate( dateValue ) )
  40                 return "date must denote a day in the current month";
  41         }
  42         catch( java.lang.Exception e )
  43         {
  44             return "oops. What did you enter for this to happen?";
  45         }
  46         return "";
  47     }
  48
  49     public boolean isValid( Object Value )
  50     {
  51         try
  52         {
  53             if ( isVoid( Value ) )
  54                 return false;
  55
  56             com.sun.star.util.Date dateValue = (com.sun.star.util.Date)
  57                 com.sun.star.uno.AnyConverter.toObject(
  58                     com.sun.star.util.Date.class, Value);
  59             if ( isDedicatedInvalidDate( dateValue ) )
  60                 return false;
  61
  62             if ( !isNextMonthsDate( dateValue ) )
  63                 return false;
  64             return true;
  65         }
  66         catch( java.lang.Exception e )
  67         {
  68             e.printStackTrace( System.err );
  69         }
  70         return false;
  71     }
  72
  73     private boolean isDedicatedInvalidDate( com.sun.star.util.Date dateValue )
  74     {
  75         return ( dateValue.Day == 0 ) && ( dateValue.Month == 0 ) && ( dateValue.Year == 0 );
  76     }
  77
  78     private boolean isNextMonthsDate( com.sun.star.util.Date dateValue )
  79     {
  80         int overallMonth = dateValue.Year * 12 + dateValue.Month - 1;
  81
  82         int todaysMonth = new java.util.Date().getMonth();
  83         int todaysYear = new java.util.Date().getYear() + 1900;
  84         int todaysOverallMonth = todaysYear * 12 + todaysMonth;
  85
  86         return overallMonth == todaysOverallMonth;
  87     }
  88 }