odk/examples/DevelopersGuide/Forms/DateValidator.java

   1 /* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 public class DateValidator extends ControlValidator
  22 {
  23
  24     /** Creates a new instance of NumericValidator */
  25     public DateValidator( )
  26     {
  27     }
  28
  29     public String explainInvalid( Object Value )
  30     {
  31         try
  32         {
  33             if ( isVoid( Value ) )
  34                 return "empty input";
  35
  36             com.sun.star.util.Date dateValue = (com.sun.star.util.Date)Value;
  37             if ( isDedicatedInvalidDate( dateValue ) )
  38                 return "this is no valid date";
  39
  40             if ( !isNextMonthsDate( dateValue ) )
  41                 return "date must denote a day in the current month";
  42         }
  43         catch( java.lang.Exception e )
  44         {
  45             return "oops. What did you enter for this to happen?";
  46         }
  47         return "";
  48     }
  49
  50     public boolean isValid( Object Value )
  51     {
  52         try
  53         {
  54             if ( isVoid( Value ) )
  55                 return false;
  56
  57             com.sun.star.util.Date dateValue = (com.sun.star.util.Date)
  58                 com.sun.star.uno.AnyConverter.toObject(
  59                     com.sun.star.util.Date.class, Value);
  60             if ( isDedicatedInvalidDate( dateValue ) )
  61                 return false;
  62
  63             if ( !isNextMonthsDate( dateValue ) )
  64                 return false;
  65             return true;
  66         }
  67         catch( java.lang.Exception e )
  68         {
  69             e.printStackTrace( System.err );
  70         }
  71         return false;
  72     }
  73
  74     private boolean isDedicatedInvalidDate( com.sun.star.util.Date dateValue )
  75     {
  76         return ( dateValue.Day == 0 ) && ( dateValue.Month == 0 ) && ( dateValue.Year == 0 );
  77     }
  78
  79     private boolean isNextMonthsDate( com.sun.star.util.Date dateValue )
  80     {
  81         int overallMonth = dateValue.Year * 12 + dateValue.Month - 1;
  82
  83         int todaysMonth = new java.util.Date().getMonth();
  84         int todaysYear = new java.util.Date().getYear() + 1900;
  85         int todaysOverallMonth = todaysYear * 12 + todaysMonth;
  86
  87         return overallMonth == todaysOverallMonth;
  88     }
  89 }
  90
  91 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */