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