Package org.apache.commons.math.fraction

Class ProperBigFractionFormat

java.lang.Object

java.text.Format

java.text.NumberFormat

org.apache.commons.math.fraction.AbstractFormat

org.apache.commons.math.fraction.BigFractionFormat

org.apache.commons.math.fraction.ProperBigFractionFormat

All Implemented Interfaces:

Serializable, Cloneable

public class ProperBigFractionFormat
extends BigFractionFormat

Formats a BigFraction number in proper format. The number format for each of the whole number, numerator and, denominator can be configured.

Minus signs are only allowed in the whole number part - i.e., "-3 1/2" is legitimate and denotes -7/2, but "-3 -1/2" is invalid and will result in a ParseException.

Since:

1.1

See Also:

Serialized Form

Nested Class Summary

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

NumberFormat.Field

Field Summary

Fields inherited from class java.text.NumberFormat

FRACTION_FIELD, INTEGER_FIELD

Constructor Summary

Constructors

Constructor	Description
ProperBigFractionFormat()	Create a proper formatting instance with the default number format for the whole, numerator, and denominator.
ProperBigFractionFormat(NumberFormat format)	Create a proper formatting instance with a custom number format for the whole, numerator, and denominator.
ProperBigFractionFormat(NumberFormat wholeFormat, NumberFormat numeratorFormat, NumberFormat denominatorFormat)	Create a proper formatting instance with a custom number format for each of the whole, numerator, and denominator.

Method Summary

Modifier and Type	Method	Description
StringBuffer	format(BigFraction fraction, StringBuffer toAppendTo, FieldPosition pos)	Formats a BigFraction object to produce a string.
NumberFormat	getWholeFormat()	Access the whole format.
BigFraction	parse(String source, ParsePosition pos)	Parses a string to produce a BigFraction object.
void	setWholeFormat(NumberFormat format)	Modify the whole format.

Methods inherited from class org.apache.commons.math.fraction.BigFractionFormat

format, formatBigFraction, getAvailableLocales, getImproperInstance, getImproperInstance, getProperInstance, getProperInstance, parse

Methods inherited from class org.apache.commons.math.fraction.AbstractFormat

format, format, getDenominatorFormat, getNumeratorFormat, setDenominatorFormat, setNumeratorFormat

Methods inherited from class java.text.NumberFormat

clone, equals, format, format, getCurrency, getCurrencyInstance, getCurrencyInstance, getInstance, getInstance, getIntegerInstance, getIntegerInstance, getMaximumFractionDigits, getMaximumIntegerDigits, getMinimumFractionDigits, getMinimumIntegerDigits, getNumberInstance, getNumberInstance, getPercentInstance, getPercentInstance, getRoundingMode, hashCode, isGroupingUsed, isParseIntegerOnly, parseObject, setCurrency, setGroupingUsed, setMaximumFractionDigits, setMaximumIntegerDigits, setMinimumFractionDigits, setMinimumIntegerDigits, setParseIntegerOnly, setRoundingMode

Methods inherited from class java.text.Format

format, formatToCharacterIterator, parseObject

Methods inherited from class java.lang.Object

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

Constructor Detail

ProperBigFractionFormat

public ProperBigFractionFormat()

Create a proper formatting instance with the default number format for the whole, numerator, and denominator.

ProperBigFractionFormat

public ProperBigFractionFormat(NumberFormat format)

Create a proper formatting instance with a custom number format for the whole, numerator, and denominator.

Parameters:

format - the custom format for the whole, numerator, and denominator.

ProperBigFractionFormat

public ProperBigFractionFormat(NumberFormat wholeFormat,
                               NumberFormat numeratorFormat,
                               NumberFormat denominatorFormat)

Create a proper formatting instance with a custom number format for each of the whole, numerator, and denominator.

Parameters:

wholeFormat - the custom format for the whole.

numeratorFormat - the custom format for the numerator.

denominatorFormat - the custom format for the denominator.

Method Detail

format

public StringBuffer format(BigFraction fraction,
                           StringBuffer toAppendTo,
                           FieldPosition pos)

Formats a BigFraction object to produce a string. The BigFraction is output in proper format.

Overrides:

format in class BigFractionFormat

Parameters:

fraction - the object to format.

toAppendTo - where the text is to be appended

pos - On input: an alignment field, if desired. On output: the offsets of the alignment field

Returns:

the value passed in as toAppendTo.

getWholeFormat

public NumberFormat getWholeFormat()

Access the whole format.

Returns:

the whole format.

parse

public BigFraction parse(String source,
                         ParsePosition pos)

Parses a string to produce a BigFraction object. This method expects the string to be formatted as a proper BigFraction.

Minus signs are only allowed in the whole number part - i.e., "-3 1/2" is legitimate and denotes -7/2, but "-3 -1/2" is invalid and will result in a ParseException.

Overrides:

parse in class BigFractionFormat

Parameters:

source - the string to parse

pos - input/ouput parsing parameter.

Returns:

the parsed BigFraction object.

setWholeFormat

public void setWholeFormat(NumberFormat format)

Modify the whole format.

Parameters:

format - The new whole format value.

Throws:

NullArgumentException - if format is null.