org.hipparchus.fraction

Class ProperFractionFormat

java.lang.Object

java.text.Format

java.text.NumberFormat

org.hipparchus.fraction.FractionFormat

org.hipparchus.fraction.ProperFractionFormat

All Implemented Interfaces:

Serializable, Cloneable

public class ProperFractionFormat
extends FractionFormat

Formats a Fraction 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.

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 and Description
ProperFractionFormat() Create a proper formatting instance with the default number format for the whole, numerator, and denominator.
ProperFractionFormat(NumberFormat format) Create a proper formatting instance with a custom number format for the whole, numerator, and denominator.
ProperFractionFormat(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 and Description
StringBuffer	format(double value, StringBuffer buffer, FieldPosition position) Formats a double value as a fraction and appends the result to a StringBuffer.
StringBuffer	format(Fraction fraction, StringBuffer toAppendTo, FieldPosition pos) Formats a Fraction object to produce a string.
StringBuffer	format(long value, StringBuffer buffer, FieldPosition position) Formats a long value as a fraction and appends the result to a StringBuffer.
protected static NumberFormat	getDefaultNumberFormat(Locale locale) Create a default number format.
NumberFormat	getDenominatorFormat() Access the denominator format.
NumberFormat	getNumeratorFormat() Access the numerator format.
NumberFormat	getWholeFormat() Access the whole format.
Fraction	parse(String source, ParsePosition pos) Parses a string to produce a Fraction object.
protected static void	parseAndIgnoreWhitespace(String source, ParsePosition pos) Parses source until a non-whitespace character is found.
protected static char	parseNextCharacter(String source, ParsePosition pos) Parses source until a non-whitespace character is found.

Methods inherited from class org.hipparchus.fraction.FractionFormat

format, formatFraction, getAvailableLocales, getDefaultNumberFormat, getImproperInstance, getImproperInstance, getProperInstance, getProperInstance, parse

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

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

Constructor Detail

ProperFractionFormat

public ProperFractionFormat()

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

ProperFractionFormat

public ProperFractionFormat(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.

Throws:

NullArgumentException - if the provided format is null.

ProperFractionFormat

public ProperFractionFormat(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.

Throws:

NullArgumentException - if either provided format is null.

Method Detail

format

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

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

Overrides:

format in class FractionFormat

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 Fraction parse(String source,
                      ParsePosition pos)

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

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 FractionFormat

Parameters:

source - the string to parse

pos - input/ouput parsing parameter.

Returns:

the parsed Fraction object.

getDefaultNumberFormat

protected static NumberFormat getDefaultNumberFormat(Locale locale)

Create a default number format. The default number format is based on NumberFormat.getNumberInstance(java.util.Locale). The only customization is the maximum number of BigFraction digits, which is set to 0.

Parameters:

locale - the specific locale used by the format.

Returns:

the default number format specific to the given locale.

getDenominatorFormat

public NumberFormat getDenominatorFormat()

Access the denominator format.

Returns:

the denominator format.

getNumeratorFormat

public NumberFormat getNumeratorFormat()

Access the numerator format.

Returns:

the numerator format.

parseAndIgnoreWhitespace

protected static void parseAndIgnoreWhitespace(String source,
                                               ParsePosition pos)

Parses source until a non-whitespace character is found.

Parameters:

source - the string to parse

pos - input/output parsing parameter. On output, pos holds the index of the next non-whitespace character.

parseNextCharacter

protected static char parseNextCharacter(String source,
                                         ParsePosition pos)

Parses source until a non-whitespace character is found.

Parameters:

source - the string to parse

pos - input/output parsing parameter.

Returns:

the first non-whitespace character.

format

public StringBuffer format(double value,
                           StringBuffer buffer,
                           FieldPosition position)

Formats a double value as a fraction and appends the result to a StringBuffer.

Specified by:

format in class NumberFormat

Parameters:

value - the double value to format

buffer - StringBuffer to append to

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

Returns:

a reference to the appended buffer

See Also:

NumberFormat.format(Object, StringBuffer, FieldPosition)

format

public StringBuffer format(long value,
                           StringBuffer buffer,
                           FieldPosition position)

Formats a long value as a fraction and appends the result to a StringBuffer.

Specified by:

format in class NumberFormat

Parameters:

value - the long value to format

buffer - StringBuffer to append to

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

Returns:

a reference to the appended buffer

See Also:

NumberFormat.format(Object, StringBuffer, FieldPosition)