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## org.apache.commons.math3.fraction
Class AbstractFormat

    java.lang.Object
      java.text.Format
          java.text.NumberFormat
              org.apache.commons.math3.fraction.AbstractFormat

All Implemented Interfaces:
  Serializable, Cloneable

Direct Known Subclasses:
  BigFractionFormat, FractionFormat

    public abstract class AbstractFormat

extends NumberFormat
implements Serializable

Common part shared by both `FractionFormat` and `BigFractionFormat`.

Since:
  2.0
Version:
  $Id: AbstractFormat.java 1416643 2012-12-03 19:37:14Z tn $
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
`protected` | `AbstractFormat()` Create an improper formatting instance with the default number format for the numerator and denominator.
`protected` | `AbstractFormat(NumberFormat format)` Create an improper formatting instance with a custom number format for both the numerator and denominator.
`protected` | `AbstractFormat(NumberFormat numeratorFormat, 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
`StringBuffer` | `format(double value, StringBuffer buffer, FieldPosition position)` Formats a double value as a fraction and appends the result to a StringBuffer.
`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()` Create a default number format.
`protected static NumberFormat` | `getDefaultNumberFormat(Locale locale)` Create a default number format.
`NumberFormat` | `getDenominatorFormat()` Access the denominator format.
`NumberFormat` | `getNumeratorFormat()` Access the numerator format.
`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.
`void` | `setDenominatorFormat(NumberFormat format)` Modify the denominator format.
`void` | `setNumeratorFormat(NumberFormat format)` Modify the numerator format.

Methods inherited from class java.text.NumberFormat
`clone, equals, format, format, format, getAvailableLocales, getCurrency, getCurrencyInstance, getCurrencyInstance, getInstance, getInstance, getIntegerInstance, getIntegerInstance, getMaximumFractionDigits, getMaximumIntegerDigits, getMinimumFractionDigits, getMinimumIntegerDigits, getNumberInstance, getNumberInstance, getPercentInstance, getPercentInstance, getRoundingMode, hashCode, isGroupingUsed, isParseIntegerOnly, parse, parse, 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

### AbstractFormat

    protected AbstractFormat()

  Create an improper formatting instance with the default number format for the numerator and denominator.

### AbstractFormat

    protected AbstractFormat(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.

### AbstractFormat

    protected AbstractFormat(NumberFormat numeratorFormat,
                             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

### getDefaultNumberFormat

    protected static NumberFormat getDefaultNumberFormat()

  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.

  Returns:
    the default number format.

### 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.

### setDenominatorFormat

    public void setDenominatorFormat(NumberFormat format)

  Modify the denominator format.

  Parameters:
    `format` - the new denominator format value.
  Throws:
    `NullArgumentException` - if `format` is `null`.

### setNumeratorFormat

    public void setNumeratorFormat(NumberFormat format)

  Modify the numerator format.

  Parameters:
    `format` - the new numerator format value.
  Throws:
    `NullArgumentException` - if `format` is `null`.

### 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)`

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