# Class InternationalFormatter

java.lang.Object
javax.swing.JFormattedTextField.AbstractFormatter
javax.swing.text.DefaultFormatter
javax.swing.text.InternationalFormatter

All Implemented Interfaces:
  `Serializable`, `Cloneable`

Direct Known Subclasses:
  `DateFormatter`, `NumberFormatter`

public class InternationalFormatter extends DefaultFormatter
`InternationalFormatter` extends `DefaultFormatter`, using an instance of `java.text.Format` to handle the conversion to a String, and the conversion from a String.

If `getAllowsInvalid()` is false, this will ask the `Format` to format the current text on every edit.

You can specify a minimum and maximum value by way of the `setMinimum` and `setMaximum` methods. In order for this to work the values returned from `stringToValue` must be comparable to the min/max values by way of the `Comparable` interface.

Be careful how you configure the `Format` and the `InternationalFormatter`, as it is possible to create a situation where certain values can not be input. Consider the date format 'M/d/yy', an `InternationalFormatter` that is always valid (`setAllowsInvalid(false)`), is in overwrite mode (`setOverwriteMode(true)`) and the date 7/1/99. In this case the user will not be able to enter a two digit month or day of month. To avoid this, the format should be 'MM/dd/yy'.

If `InternationalFormatter` is configured to only allow valid values (`setAllowsInvalid(false)`), every valid edit will result in the text of the `JFormattedTextField` being completely reset from the `Format`. The cursor position will also be adjusted as literal characters are added/removed from the resulting String.

`InternationalFormatter`'s behavior of `stringToValue` is slightly different than that of `DefaultTextFormatter`, it does the following:

1. `parseObject` is invoked on the `Format` specified by `setFormat`
2. If a Class has been set for the values (`setValueClass`), supers implementation is invoked to convert the value returned from `parseObject` to the appropriate class.
3. If a `ParseException` has not been thrown, and the value is outside the min/max a `ParseException` is thrown.
4. The value is returned.

`InternationalFormatter` implements `stringToValue` in this manner so that you can specify an alternate Class than `Format` may return.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the `java.beans` package. Please see `XMLEncoder`.

Since:
  1.4
See Also:
  - `Format`
  - `Comparable`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `InternationalFormatter()`
  Creates an `InternationalFormatter` with no `Format` specified.
  `InternationalFormatter(Format format)`
  Creates an `InternationalFormatter` with the specified `Format` instance.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Object`
  `clone()`
  Creates a copy of the DefaultFormatter.
  `protected Action[]`
  `getActions()`
  If `getSupportsIncrement` returns true, this returns two Actions suitable for incrementing/decrementing the value.
  `Format.Field[]`
  `getFields(int offset)`
  Returns the `Format.Field` constants associated with the text at `offset`.
  `Format`
  `getFormat()`
  Returns the format that dictates the legal values that can be edited and displayed.
  `Comparable<?>`
  `getMaximum()`
  Returns the maximum permissible value.
  `Comparable<?>`
  `getMinimum()`
  Returns the minimum permissible value.
  `void`
  `install(JFormattedTextField ftf)`
  Installs the `DefaultFormatter` onto a particular `JFormattedTextField`.
  `void`
  `setFormat(Format format)`
  Sets the format that dictates the legal values that can be edited and displayed.
  `void`
  `setMaximum(Comparable<?> max)`
  Sets the maximum permissible value.
  `void`
  `setMinimum(Comparable<?> minimum)`
  Sets the minimum permissible value.
  `Object`
  `stringToValue(String text)`
  Returns the `Object` representation of the `String` `text`.
  `String`
  `valueToString(Object value)`
  Returns a String representation of the Object `value`.

  ### Methods declared in class javax.swing.text.DefaultFormatter

  `getAllowsInvalid, getCommitsOnValidEdit, getDocumentFilter, getNavigationFilter, getOverwriteMode, getValueClass, setAllowsInvalid, setCommitsOnValidEdit, setOverwriteMode, setValueClass`

  ### Methods declared in class javax.swing.JFormattedTextField.AbstractFormatter

  `getFormattedTextField, invalidEdit, setEditValid, uninstall`

  ### Methods declared in class java.lang.Object

  `equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Constructor Details

  - ### InternationalFormatter

    public InternationalFormatter()
    Creates an `InternationalFormatter` with no `Format` specified.

  - ### InternationalFormatter

    public InternationalFormatter(Format format)
    Creates an `InternationalFormatter` with the specified `Format` instance.
    Parameters:
      `format` - Format instance used for converting from/to Strings

- ## Method Details

  - ### setFormat

    public void setFormat(Format format)
    Sets the format that dictates the legal values that can be edited and displayed.
    Parameters:
      `format` - `Format` instance used for converting from/to Strings

  - ### getFormat

    public Format getFormat()
    Returns the format that dictates the legal values that can be edited and displayed.
    Returns:
      Format instance used for converting from/to Strings

  - ### setMinimum

    public void setMinimum(Comparable<?> minimum)
    Sets the minimum permissible value. If the `valueClass` has not been specified, and `minimum` is non null, the `valueClass` will be set to that of the class of `minimum`.
    Parameters:
      `minimum` - Minimum legal value that can be input
    See Also:
      - `DefaultFormatter.setValueClass(java.lang.Class<?>)`

  - ### getMinimum

    public Comparable<?> getMinimum()
    Returns the minimum permissible value.
    Returns:
      Minimum legal value that can be input

  - ### setMaximum

    public void setMaximum(Comparable<?> max)
    Sets the maximum permissible value. If the `valueClass` has not been specified, and `max` is non null, the `valueClass` will be set to that of the class of `max`.
    Parameters:
      `max` - Maximum legal value that can be input
    See Also:
      - `DefaultFormatter.setValueClass(java.lang.Class<?>)`

  - ### getMaximum

    public Comparable<?> getMaximum()
    Returns the maximum permissible value.
    Returns:
      Maximum legal value that can be input

  - ### install

    public void install(JFormattedTextField ftf)
    Installs the `DefaultFormatter` onto a particular `JFormattedTextField`. This will invoke `valueToString` to convert the current value from the `JFormattedTextField` to a String. This will then install the `Action`s from `getActions`, the `DocumentFilter` returned from `getDocumentFilter` and the `NavigationFilter` returned from `getNavigationFilter` onto the `JFormattedTextField`.

    Subclasses will typically only need to override this if they wish to install additional listeners on the `JFormattedTextField`.

    If there is a `ParseException` in converting the current value to a String, this will set the text to an empty String, and mark the `JFormattedTextField` as being in an invalid state.

    While this is a public method, this is typically only useful for subclassers of `JFormattedTextField`. `JFormattedTextField` will invoke this method at the appropriate times when the value changes, or its internal state changes.

    Overrides:
      `install` in class `DefaultFormatter`
    Parameters:
      `ftf` - JFormattedTextField to format for, may be null indicating uninstall from current JFormattedTextField.

  - ### valueToString

    public String valueToString(Object value) throws ParseException
    Returns a String representation of the Object `value`. This invokes `format` on the current `Format`.
    Overrides:
      `valueToString` in class `DefaultFormatter`
    Parameters:
      `value` - Value to convert
    Returns:
      String representation of value
    Throws:
      `ParseException` - if there is an error in the conversion

  - ### stringToValue

    public Object stringToValue(String text) throws ParseException
    Returns the `Object` representation of the `String` `text`.
    Overrides:
      `stringToValue` in class `DefaultFormatter`
    Parameters:
      `text` - `String` to convert
    Returns:
      `Object` representation of text
    Throws:
      `ParseException` - if there is an error in the conversion

  - ### getFields

    public Format.Field[] getFields(int offset)
    Returns the `Format.Field` constants associated with the text at `offset`. If `offset` is not a valid location into the current text, this will return an empty array.
    Parameters:
      `offset` - offset into text to be examined
    Returns:
      Format.Field constants associated with the text at the given position.

  - ### clone

    public Object clone() throws CloneNotSupportedException
    Creates a copy of the DefaultFormatter.
    Overrides:
      `clone` in class `DefaultFormatter`
    Returns:
      copy of the DefaultFormatter
    Throws:
      `CloneNotSupportedException` - if the object's class does not support the `Cloneable` interface. Subclasses that override the `clone` method can also throw this exception to indicate that an instance cannot be cloned.
    See Also:
      - `Cloneable`

  - ### getActions

    protected Action[] getActions()
    If `getSupportsIncrement` returns true, this returns two Actions suitable for incrementing/decrementing the value.
    Overrides:
      `getActions` in class `JFormattedTextField.AbstractFormatter`
    Returns:
      Array of Actions to install on JFormattedTextField