javax.swing.text

Interface AbstractDocument.Content

All Known Implementing Classes:

GapContent, StringContent

Enclosing class:

AbstractDocument

public static interface AbstractDocument.Content

Interface to describe a sequence of character content that can be edited. Implementations may or may not support a history mechanism which will be reflected by whether or not mutations return an UndoableEdit implementation.

See Also:

AbstractDocument

Method Summary

Modifier and Type	Method and 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 txt) Gets a sequence of characters and copies them into a Segment.
String	getString(int where, int len) Fetches a string of characters contained in the sequence.
UndoableEdit	insertString(int where, String str) Inserts a string of characters into the sequence.
int	length() Current length of the sequence of character content.
UndoableEdit	remove(int where, int nitems) Removes some portion of the sequence.

Method Detail

createPosition

Position createPosition(int offset)
                 throws BadLocationException

Creates a position within the content that will track change as the content is mutated.

Throws:

BadLocationException - for an invalid offset

Parameters:

offset - the offset in the content >= 0

Returns:

a Position

length

int length()

Current length of the sequence of character content.

Returns:

the length >= 0

insertString

UndoableEdit insertString(int where,
                          String str)
                   throws BadLocationException

Inserts a string of characters into the sequence.

Throws:

BadLocationException - thrown if the area covered by the arguments is not contained in the character sequence

Parameters:

where - offset into the sequence to make the insertion >= 0

str - string to insert

Returns:

if the implementation supports a history mechanism, a reference to an Edit implementation will be returned, otherwise returns null

remove

UndoableEdit remove(int where,
                    int nitems)
             throws BadLocationException

Removes some portion of the sequence.

Throws:

BadLocationException - Thrown if the area covered by the arguments is not contained in the character sequence.

Parameters:

where - The offset into the sequence to make the insertion >= 0.

nitems - The number of items in the sequence to remove >= 0.

Returns:

If the implementation supports a history mechanism, a reference to an Edit implementation will be returned, otherwise null.

getString

String getString(int where,
                 int len)
          throws BadLocationException

Fetches a string of characters contained in the sequence.

Throws:

BadLocationException - Thrown if the area covered by the arguments is not contained in the character sequence.

Parameters:

where - Offset into the sequence to fetch >= 0.

len - number of characters to copy >= 0.

Returns:

the string

getChars

void getChars(int where,
              int len,
              Segment txt)
       throws BadLocationException

Gets a sequence of characters and copies them into a Segment.

Throws:

BadLocationException - Thrown if the area covered by the arguments is not contained in the character sequence.

Parameters:

where - the starting offset >= 0

len - the number of characters >= 0

txt - the target location to copy into