Package com.jgoodies.common.format

Class EmptyDateFormat

java.lang.Object

java.text.Format

java.text.DateFormat

com.jgoodies.common.format.AbstractWrappedDateFormat

com.jgoodies.common.format.EmptyDateFormat

All Implemented Interfaces:

Serializable, Cloneable

public final class EmptyDateFormat
extends AbstractWrappedDateFormat

Wraps a given DateFormat and adds behavior to convert to/from the empty string. Therefore it holds an empty value that is mapped to/from the empty string. The #format result of the empty value is the empty string, and the #parse result of the empty string is the empty value. In all other cases the formatting and parsing is forwarded to the wrapped DateFormat.

Often the empty value is null but you can construct an EmptyDateFormat with a given Date.

Examples:

 new EmptyDateFormat(DateFormat.getDateInstance());
 new EmptyDateFormat(DateFormat.getDateInstance(), new Date());

 new EmptyDateFormat(DateFormat.getDateInstance(DateFormat.SHORT));
 new EmptyDateFormat(DateFormat.getDateInstance(DateFormat.SHORT), new Date());
 

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.text.DateFormat

DateFormat.Field

Field Summary

Fields

Modifier and Type	Field	Description
private final Date	emptyValue	Holds the object that represents the empty value.

Fields inherited from class com.jgoodies.common.format.AbstractWrappedDateFormat

delegate

Fields inherited from class java.text.DateFormat

AM_PM_FIELD, calendar, DATE_FIELD, DAY_OF_WEEK_FIELD, DAY_OF_WEEK_IN_MONTH_FIELD, DAY_OF_YEAR_FIELD, DEFAULT, ERA_FIELD, FULL, HOUR_OF_DAY0_FIELD, HOUR_OF_DAY1_FIELD, HOUR0_FIELD, HOUR1_FIELD, LONG, MEDIUM, MILLISECOND_FIELD, MINUTE_FIELD, MONTH_FIELD, numberFormat, SECOND_FIELD, SHORT, TIMEZONE_FIELD, WEEK_OF_MONTH_FIELD, WEEK_OF_YEAR_FIELD, YEAR_FIELD

Constructor Summary

Constructors

Constructor	Description
EmptyDateFormat(DateFormat delegate)	Constructs an EmptyFormat that wraps the given mandatory format to convert null to the empty string and vice versa.
EmptyDateFormat(DateFormat delegate, Date emptyValue)	Constructs an EmptyFormat that wraps the given mandatory format to convert the given emptyValue to the empty string and vice versa.

Method Summary

Modifier and Type	Method	Description
StringBuffer	format(Date date, StringBuffer toAppendTo, FieldPosition pos)
Date	parse(String source, ParsePosition pos)

Methods inherited from class com.jgoodies.common.format.AbstractWrappedDateFormat

formatToCharacterIterator, getCalendar, getNumberFormat, getTimeZone, isLenient, setCalendar, setLenient, setNumberFormat, setTimeZone

Methods inherited from class java.text.DateFormat

clone, equals, format, format, getAvailableLocales, getDateInstance, getDateInstance, getDateInstance, getDateTimeInstance, getDateTimeInstance, getDateTimeInstance, getInstance, getTimeInstance, getTimeInstance, getTimeInstance, hashCode, parse, parseObject

Methods inherited from class java.text.Format

format, parseObject

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Details

emptyValue

private final Date emptyValue

Holds the object that represents the empty value. The result of formatting this value is the empty string; the result of parsing an empty string is this object.

Constructor Details

EmptyDateFormat

public EmptyDateFormat(DateFormat delegate)

Constructs an EmptyFormat that wraps the given mandatory format to convert null to the empty string and vice versa.

Parameters:

delegate - the format that handles the standard cases

Throws:

NullPointerException - if delegate is null

EmptyDateFormat

public EmptyDateFormat(DateFormat delegate,
 Date emptyValue)

Constructs an EmptyFormat that wraps the given mandatory format to convert the given emptyValue to the empty string and vice versa.

Parameters:

delegate - the format that handles non-null values

emptyValue - the representation of the empty string

Throws:

NullPointerException - if delegate is null

Method Details

format

public StringBuffer format(Date date,
 StringBuffer toAppendTo,
 FieldPosition pos)

Specified by:

format in class AbstractWrappedDateFormat

parse

public Date parse(String source,
 ParsePosition pos)

Specified by:

parse in class AbstractWrappedDateFormat