Module java.desktop
Package javax.swing.text

# Class StringContent

java.lang.Object
javax.swing.text.StringContent

All Implemented Interfaces:
  `Serializable`, `AbstractDocument.Content`

public final class StringContent extends Object implements AbstractDocument.Content, Serializable
An implementation of the AbstractDocument.Content interface that is a brute force implementation that is useful for relatively small documents and/or debugging. It manages the character content as a simple character array. It is also quite inefficient.

It is generally recommended that the gap buffer or piece table implementations be used instead. This buffer does not scale up to large sizes.

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`.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `StringContent()`
  Creates a new StringContent object.
  `StringContent(int initialLength)`
  Creates a new StringContent object, with the initial size specified.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Position`
  `createPosition(int offset)`
  Creates a position within the content that will track change as the content is mutated.
  `void`
  `getChars(int where, int len, Segment chars)`
  Retrieves a portion of the content.
  `protected Vector`
  `getPositionsInRange(Vector v, int offset, int length)`
  Returns a Vector containing instances of UndoPosRef for the Positions in the range `offset` to `offset` + `length`.
  `String`
  `getString(int where, int len)`
  Retrieves a portion of the content.
  `UndoableEdit`
  `insertString(int where, String str)`
  Inserts a string into the content.
  `int`
  `length()`
  Returns the length of the content.
  `UndoableEdit`
  `remove(int where, int nitems)`
  Removes part of the content.
  `protected void`
  `updateUndoPositions(Vector positions)`
  Resets the location for all the UndoPosRef instances in `positions`.

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

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

- ## Constructor Details

  - ### StringContent

    public StringContent()
    Creates a new StringContent object. Initial size defaults to 10.

  - ### StringContent

    public StringContent(int initialLength)
    Creates a new StringContent object, with the initial size specified. If the length is < 1, a size of 1 is used.
    Parameters:
      `initialLength` - the initial size

- ## Method Details

  - ### length

    public int length()
    Returns the length of the content.
    Specified by:
      `length` in interface `AbstractDocument.Content`
    Returns:
      the length >= 1
    See Also:
      - `AbstractDocument.Content.length()`

  - ### insertString

    public UndoableEdit insertString(int where, String str) throws BadLocationException
    Inserts a string into the content.
    Specified by:
      `insertString` in interface `AbstractDocument.Content`
    Parameters:
      `where` - the starting position >= 0 && < length()
      `str` - the non-null string to insert
    Returns:
      an UndoableEdit object for undoing
    Throws:
      `BadLocationException` - if the specified position is invalid
    See Also:
      - `AbstractDocument.Content.insertString(int, java.lang.String)`

  - ### remove

    public UndoableEdit remove(int where, int nitems) throws BadLocationException
    Removes part of the content. where + nitems must be < length().
    Specified by:
      `remove` in interface `AbstractDocument.Content`
    Parameters:
      `where` - the starting position >= 0
      `nitems` - the number of characters to remove >= 0
    Returns:
      an UndoableEdit object for undoing
    Throws:
      `BadLocationException` - if the specified position is invalid
    See Also:
      - `AbstractDocument.Content.remove(int, int)`

  - ### getString

    public String getString(int where, int len) throws BadLocationException
    Retrieves a portion of the content. where + len must be <= length().
    Specified by:
      `getString` in interface `AbstractDocument.Content`
    Parameters:
      `where` - the starting position >= 0
      `len` - the length to retrieve >= 0
    Returns:
      a string representing the content; may be empty
    Throws:
      `BadLocationException` - if the specified position is invalid
    See Also:
      - `AbstractDocument.Content.getString(int, int)`

  - ### getChars

    public void getChars(int where, int len, Segment chars) throws BadLocationException
    Retrieves a portion of the content. where + len must be <= length()
    Specified by:
      `getChars` in interface `AbstractDocument.Content`
    Parameters:
      `where` - the starting position >= 0
      `len` - the number of characters to retrieve >= 0
      `chars` - the Segment object to return the characters in
    Throws:
      `BadLocationException` - if the specified position is invalid
    See Also:
      - `AbstractDocument.Content.getChars(int, int, javax.swing.text.Segment)`

  - ### createPosition

    public Position createPosition(int offset) throws BadLocationException
    Creates a position within the content that will track change as the content is mutated.
    Specified by:
      `createPosition` in interface `AbstractDocument.Content`
    Parameters:
      `offset` - the offset to create a position for >= 0
    Returns:
      the position
    Throws:
      `BadLocationException` - if the specified position is invalid

  - ### getPositionsInRange

    protected Vector getPositionsInRange(Vector v, int offset, int length)
    Returns a Vector containing instances of UndoPosRef for the Positions in the range `offset` to `offset` + `length`. If `v` is not null the matching Positions are placed in there. The vector with the resulting Positions are returned.

    This is meant for internal usage, and is generally not of interest to subclasses.

    Parameters:
      `v` - the Vector to use, with a new one created on null
      `offset` - the starting offset >= 0
      `length` - the length >= 0
    Returns:
      the set of instances

  - ### updateUndoPositions

    protected void updateUndoPositions(Vector positions)
    Resets the location for all the UndoPosRef instances in `positions`.

    This is meant for internal usage, and is generally not of interest to subclasses.

    Parameters:
      `positions` - the positions of the instances