odk/examples/DevelopersGuide/Forms/NumericValidator.java

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   9  * $RCSfile: NumericValidator.java,v $
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  30
  31 import com.sun.star.form.binding.*;
  32
  33 /**
  34  *
  35  * @author  fs@openoffice.org
  36  */
  37 public class NumericValidator extends ControlValidator
  38 {
  39
  40     /** Creates a new instance of NumericValidator */
  41     public NumericValidator( )
  42     {
  43     }
  44
  45     public String explainInvalid( Object Value )
  46     {
  47         try
  48         {
  49             double value = ((Double)Value).doubleValue();
  50             if ( Double.compare( Double.NaN, value ) == 0 )
  51                 return "This is NotANumber";
  52             if ( !isProperRange( value ) )
  53                 return "The value must be between 0 and 100";
  54             if ( !isProperDigitCount( value ) )
  55                 return "The value must have at most one decimal digit";
  56         }
  57         catch( java.lang.Exception e )
  58         {
  59             return "This is no valid number";
  60         }
  61         return "";
  62     }
  63
  64     public boolean isValid( Object Value )
  65     {
  66         try
  67         {
  68             double value = ((Double)Value).doubleValue();
  69             if ( Double.compare( Double.NaN, value ) == 0 )
  70                 return false;
  71             if ( !isProperRange( value ) )
  72                 return false;
  73             if ( !isProperDigitCount( value ) )
  74                 return false;
  75             return true;
  76         }
  77         catch( java.lang.Exception e )
  78         {
  79         }
  80         return false;
  81     }
  82
  83     private boolean isProperRange( double value)
  84     {
  85         return ( value >= 0 ) && ( value <= 100 );
  86     }
  87
  88     private boolean isProperDigitCount( double value)
  89     {
  90         return ( java.lang.Math.floor( value * 10 ) == value * 10 );
  91     }
  92 }