Package org.apache.commons.math.fraction

Class FractionFormat

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable
    Direct Known Subclasses:
    ProperFractionFormat
    public class FractionFormat
extends AbstractFormat
    Formats a Fraction number in proper format or improper format. The number format for each of the whole number, numerator and, denominator can be configured.
    Since:
    1.1
    Version:
    $Revision: 983921 $ $Date: 2010-08-10 12:46:06 +0200 (mar. 10 août 2010) $
    See Also:
    Serialized Form

    • Nested Class Summary

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

        java.text.NumberFormat.Field

    • Constructor Summary

      Constructors 
      Constructor Description
      FractionFormat()
      Create an improper formatting instance with the default number format for the numerator and denominator.
      FractionFormat​(java.text.NumberFormat format)
      Create an improper formatting instance with a custom number format for both the numerator and denominator.
      FractionFormat​(java.text.NumberFormat numeratorFormat, java.text.NumberFormat denominatorFormat)
      Create an improper formatting instance with a custom number format for the numerator and a custom number format for the denominator.

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.StringBuffer format​(java.lang.Object obj, java.lang.StringBuffer toAppendTo, java.text.FieldPosition pos)
      Formats an object and appends the result to a StringBuffer.
      java.lang.StringBuffer format​(Fraction fraction, java.lang.StringBuffer toAppendTo, java.text.FieldPosition pos)
      Formats a Fraction object to produce a string.
      static java.lang.String formatFraction​(Fraction f)
      This static method calls formatFraction() on a default instance of FractionFormat.
      static java.util.Locale[] getAvailableLocales()
      Get the set of locales for which complex formats are available.
      protected static java.text.NumberFormat getDefaultNumberFormat()
      Create a default number format.
      static FractionFormat getImproperInstance()
      Returns the default complex format for the current locale.
      static FractionFormat getImproperInstance​(java.util.Locale locale)
      Returns the default complex format for the given locale.
      static FractionFormat getProperInstance()
      Returns the default complex format for the current locale.
      static FractionFormat getProperInstance​(java.util.Locale locale)
      Returns the default complex format for the given locale.
      Fraction parse​(java.lang.String source)
      Parses a string to produce a Fraction object.
      Fraction parse​(java.lang.String source, java.text.ParsePosition pos)
      Parses a string to produce a Fraction object.

      • 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

      • FractionFormat

        public FractionFormat()
        Create an improper formatting instance with the default number format for the numerator and denominator.

      • FractionFormat

        public FractionFormat​(java.text.NumberFormat format)
        Create an improper formatting instance with a custom number format for both the numerator and denominator.
        Parameters:
        format - the custom format for both the numerator and denominator.

      • FractionFormat

        public FractionFormat​(java.text.NumberFormat numeratorFormat,
                      java.text.NumberFormat denominatorFormat)
        Create an improper formatting instance with a custom number format for the numerator and a custom number format for the denominator.
        Parameters:
        numeratorFormat - the custom format for the numerator.
        denominatorFormat - the custom format for the denominator.

    • Method Detail

      • getAvailableLocales

        public static java.util.Locale[] getAvailableLocales()
        Get the set of locales for which complex formats are available. This is the same set as the NumberFormat set.
        Returns:
        available complex format locales.

      • formatFraction

        public static java.lang.String formatFraction​(Fraction f)
        This static method calls formatFraction() on a default instance of FractionFormat.
        Parameters:
        f - Fraction object to format
        Returns:
        A formatted fraction in proper form.

      • getImproperInstance

        public static FractionFormat getImproperInstance()
        Returns the default complex format for the current locale.
        Returns:
        the default complex format.

      • getImproperInstance

        public static FractionFormat getImproperInstance​(java.util.Locale locale)
        Returns the default complex format for the given locale.
        Parameters:
        locale - the specific locale used by the format.
        Returns:
        the complex format specific to the given locale.

      • getProperInstance

        public static FractionFormat getProperInstance()
        Returns the default complex format for the current locale.
        Returns:
        the default complex format.

      • getProperInstance

        public static FractionFormat getProperInstance​(java.util.Locale locale)
        Returns the default complex format for the given locale.
        Parameters:
        locale - the specific locale used by the format.
        Returns:
        the complex format specific to the given locale.

      • getDefaultNumberFormat

        protected static java.text.NumberFormat getDefaultNumberFormat()
        Create a default number format. The default number format is based on NumberFormat.getNumberInstance(java.util.Locale) with the only customizing is the maximum number of fraction digits, which is set to 0.
        Returns:
        the default number format.

      • format

        public java.lang.StringBuffer format​(Fraction fraction,
                                     java.lang.StringBuffer toAppendTo,
                                     java.text.FieldPosition pos)
        Formats a Fraction object to produce a string. The fraction is output in improper format.
        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.

      • format

        public java.lang.StringBuffer format​(java.lang.Object obj,
                                     java.lang.StringBuffer toAppendTo,
                                     java.text.FieldPosition pos)
        Formats an object and appends the result to a StringBuffer. obj must be either a Fraction object or a Number object. Any other type of object will result in an IllegalArgumentException being thrown.
        Overrides:
        format in class java.text.NumberFormat
        Parameters:
        obj - 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.
        Throws:
        java.lang.IllegalArgumentException - is obj is not a valid type.
        See Also:
        Format.format(java.lang.Object, java.lang.StringBuffer, java.text.FieldPosition)

      • parse

        public Fraction parse​(java.lang.String source)
               throws java.text.ParseException
        Parses a string to produce a Fraction object.
        Overrides:
        parse in class java.text.NumberFormat
        Parameters:
        source - the string to parse
        Returns:
        the parsed Fraction object.
        Throws:
        java.text.ParseException - if the beginning of the specified string cannot be parsed.

      • parse

        public Fraction parse​(java.lang.String source,
                      java.text.ParsePosition pos)
        Parses a string to produce a Fraction object. This method expects the string to be formatted as an improper fraction.
        Specified by:
        parse in class java.text.NumberFormat
        Parameters:
        source - the string to parse
        pos - input/ouput parsing parameter.
        Returns:
        the parsed Fraction object.