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java.lang.Objectjava.text.Format
java.text.NumberFormat
com.jgoodies.common.format.EmptyNumberFormat
public final class EmptyNumberFormat
Wraps a given NumberFormat
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 NumberFormat.
Examples:
new EmptyNumberFormat(NumberFormat().getInstance()); new EmptyNumberFormat(NumberFormat().getIntegerInstance(), -1);
Nested Class Summary |
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Nested classes/interfaces inherited from class java.text.NumberFormat |
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NumberFormat.Field |
Field Summary |
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Fields inherited from class java.text.NumberFormat |
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FRACTION_FIELD, INTEGER_FIELD |
Constructor Summary | |
---|---|
EmptyNumberFormat(NumberFormat delegate)
Constructs an EmptyNumberFormat that wraps the given mandatory format to convert null to the empty string and vice versa. |
|
EmptyNumberFormat(NumberFormat delegate,
int emptyValue)
Constructs an EmptyNumberFormat that wraps the given mandatory format to convert the given emptyValue to the empty string
and vice versa. |
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EmptyNumberFormat(NumberFormat delegate,
Number emptyValue)
Constructs an EmptyNumberFormat that wraps the given mandatory format to convert the given emptyValue to the empty string
and vice versa. |
Method Summary | |
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StringBuffer |
format(double number,
StringBuffer toAppendTo,
FieldPosition pos)
|
StringBuffer |
format(long number,
StringBuffer toAppendTo,
FieldPosition pos)
|
StringBuffer |
format(Object obj,
StringBuffer toAppendTo,
FieldPosition pos)
If obj is equal to the emptyValue,
toAppendTo is returned. |
Number |
parse(String source)
If source is empty or whitespace, the emptyValue
is returned. |
Number |
parse(String source,
ParsePosition pos)
|
Object |
parseObject(String source)
If source is empty or whitespace, the emptyValue
is returned. |
Methods inherited from class java.text.Format |
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format, formatToCharacterIterator |
Methods inherited from class java.lang.Object |
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finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public EmptyNumberFormat(NumberFormat delegate)
null
to the empty string and vice versa.
delegate
- the format that handles the standard cases
NullPointerException
- if delegate
is null
public EmptyNumberFormat(NumberFormat delegate, int 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
public EmptyNumberFormat(NumberFormat delegate, Number 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 |
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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 NumberFormat
public StringBuffer format(double number, StringBuffer toAppendTo, FieldPosition pos)
format
in class NumberFormat
public StringBuffer format(long number, StringBuffer toAppendTo, FieldPosition pos)
format
in class NumberFormat
public Object parseObject(String source) throws ParseException
If source
is empty or whitespace, the emptyValue
is returned. Otherwise parsing is forwarded to the delegate
- indirectly via parse(String, ParsePosition)
.
parseObject
in class Format
ParseException
public Number parse(String source) throws ParseException
If source
is empty or whitespace, the emptyValue
is returned. Otherwise parsing is forwarded to the delegate
- indirectly via parse(String, ParsePosition)
.
parse
in class NumberFormat
ParseException
public Number parse(String source, ParsePosition pos)
parse
in class NumberFormat
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