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27 
28 import com.sun.star.form.binding.*;
29 
30 /**
31  *
32  * @author  fs@openoffice.org
33  */
34 public class DateValidator extends ControlValidator
35 {
36 
37     /** Creates a new instance of NumericValidator */
38     public DateValidator( )
39     {
40     }
41 
42     public String explainInvalid( Object Value )
43     {
44         try
45         {
46             if ( isVoid( Value ) )
47                 return "empty input";
48 
49             com.sun.star.util.Date dateValue = (com.sun.star.util.Date)Value;
50             if ( isDedicatedInvalidDate( dateValue ) )
51                 return "this is no valid date";
52 
53             if ( !isNextMonthsDate( dateValue ) )
54                 return "date must denote a day in the current month";
55         }
56         catch( java.lang.Exception e )
57         {
58             return "oops. What did you enter for this to happen?";
59         }
60         return "";
61     }
62 
63     public boolean isValid( Object Value )
64     {
65         try
66         {
67             if ( isVoid( Value ) )
68                 return false;
69 
70             com.sun.star.util.Date dateValue = (com.sun.star.util.Date)
71                 com.sun.star.uno.AnyConverter.toObject(
72                     com.sun.star.util.Date.class, Value);
73             if ( isDedicatedInvalidDate( dateValue ) )
74                 return false;
75 
76             if ( !isNextMonthsDate( dateValue ) )
77                 return false;
78             return true;
79         }
80         catch( java.lang.Exception e )
81         {
82             e.printStackTrace( System.err );
83         }
84         return false;
85     }
86 
87     private boolean isDedicatedInvalidDate( com.sun.star.util.Date dateValue )
88     {
89         return ( dateValue.Day == 0 ) && ( dateValue.Month == 0 ) && ( dateValue.Year == 0 );
90     }
91 
92     private boolean isNextMonthsDate( com.sun.star.util.Date dateValue )
93     {
94         int overallMonth = dateValue.Year * 12 + dateValue.Month - 1;
95 
96         int todaysMonth = new java.util.Date().getMonth();
97         int todaysYear = new java.util.Date().getYear() + 1900;
98         int todaysOverallMonth = todaysYear * 12 + todaysMonth;
99 
100         return overallMonth == todaysOverallMonth;
101     }
102 }
103