com.jgoodies.binding.formatter

Class EmptyDateFormatter


public class EmptyDateFormatter
extends DateFormatter

In addition to its superclass DateFormatter, this class converts to/from the empty string. Therefore it holds an empty value that is the counterpart of the empty string. The Method #valueToString converts the empty value to the empty string. And #stringToValue converts blank strings to the empty value. In all other cases the conversion is delegated to its superclass.

Often the empty value is null. As an alternative you can map the empty string to a given date, for example epoch (January 1, 1970). Examples:

 new EmptyDateFormatter();
 new EmptyDateFormatter(new Date(0));
 
Version:
$Revision: 1.4 $
Author:
Karsten Lentzsch
See Also:
java.text.Format

Constructor Summary

EmptyDateFormatter()
Constructs an EmptyDateFormatter that converts null to the empty string and vice versa.
EmptyDateFormatter(Date emptyValue)
Constructs an EmptyDateFormatter that converts the given emptyValue to the empty string and vice versa.
EmptyDateFormatter(DateFormat format)
Constructs an EmptyDateFormatter configured with the specified Format; maps null to the empty string and vice versa.
EmptyDateFormatter(DateFormat format, Date emptyValue)
Constructs an EmptyDateFormatter configured with the specified Format; maps null to the given emptyValue and vice versa.

Method Summary

@Override
Object stringToValue(String text)
Returns the Object representation of the String text.
@Override
String valueToString(Object value)
Returns a String representation of the Object value.

Constructor Details

EmptyDateFormatter

public EmptyDateFormatter()
Constructs an EmptyDateFormatter that converts null to the empty string and vice versa.

EmptyDateFormatter

public EmptyDateFormatter(Date emptyValue)
Constructs an EmptyDateFormatter that converts the given emptyValue to the empty string and vice versa.
Parameters:
emptyValue - the representation of the empty string

EmptyDateFormatter

public EmptyDateFormatter(DateFormat format)
Constructs an EmptyDateFormatter configured with the specified Format; maps null to the empty string and vice versa.
Parameters:
format - Format used to dictate legal values

EmptyDateFormatter

public EmptyDateFormatter(DateFormat format,
                          Date emptyValue)
Constructs an EmptyDateFormatter configured with the specified Format; maps null to the given emptyValue and vice versa.
Parameters:
format - Format used to dictate legal values
emptyValue - the representation of the empty string

Method Details

Object stringToValue

public @Override Object stringToValue(String text)
            throws ParseException
Returns the Object representation of the String text.

Unlike its superclass, this class converts blank strings to the empty value.

Parameters:
text - String to convert
Returns:
Object representation of text

String valueToString

public @Override String valueToString(Object value)
            throws ParseException
Returns a String representation of the Object value. This invokes format on the current Format.

Unlike its superclass, this class converts the empty value to the empty string.

Parameters:
value - the value to convert
Returns:
a String representation of value

Copyright © 2002-2007 JGoodies Karsten Lentzsch. All Rights Reserved.