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java.lang.Objectjava.text.Format
com.jgoodies.common.format.EmptyFormat
public class EmptyFormat
Wraps a given Format
and adds behavior to convert to/from
the empty string. Therefore it holds an empty value
(often null
) 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 Format.
If you want to wrap a DateFormat or NumberFormat, you may use
EmptyDateFormat
or EmptyNumberFormat
resp.
Examples:
new EmptyFormat(new WeightFormat());
Nested Class Summary |
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Nested classes/interfaces inherited from class java.text.Format |
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Format.Field |
Constructor Summary | |
---|---|
EmptyFormat(Format delegate)
Constructs an EmptyFormat that wraps the given mandatory format to convert null to the empty string and vice versa. |
|
EmptyFormat(Format delegate,
Object emptyValue)
Constructs an EmptyFormat that wraps the given mandatory format to convert the given emptyValue to the empty string
and vice versa. |
Method Summary | |
---|---|
StringBuffer |
format(Object obj,
StringBuffer toAppendTo,
FieldPosition pos)
If obj is equal to the emptyValue,
toAppendTo is returned. |
AttributedCharacterIterator |
formatToCharacterIterator(Object obj)
|
Object |
parseObject(String source)
If source is empty or whitespace, the emptyValue
is returned. |
Object |
parseObject(String source,
ParsePosition pos)
|
Methods inherited from class java.text.Format |
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clone, format |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public EmptyFormat(Format delegate)
null
to the empty string and vice versa.
delegate
- the format that handles the standard cases
NullPointerException
- if delegate
is null
public EmptyFormat(Format delegate, Object emptyValue)
emptyValue
to the empty string
and vice versa.
delegate
- the format that handles non-null
valuesemptyValue
- the representation of the empty string
NullPointerException
- if delegate
is null
Method Detail |
---|
public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos)
If obj
is equal to the emptyValue,
toAppendTo
is returned. Otherwise the format
is forwarded to the delegate.
format
in class Format
public Object parseObject(String source) throws ParseException
If source
is empty or whitespace, the emptyValue
is returned. Otherwise parsing is forwarded to the delegate.
parseObject
in class Format
ParseException
public final Object parseObject(String source, ParsePosition pos)
parseObject
in class Format
public final AttributedCharacterIterator formatToCharacterIterator(Object obj)
formatToCharacterIterator
in class Format
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