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

Methods

createPosition

Position createPosition(int offset)
                 throws BadLocationException

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

Parameters:

offset - the offset in the content >= 0

Returns:

a Position

Throws:

BadLocationException - for an invalid offset

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.

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

Throws:

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

remove

UndoableEdit remove(int where,
                    int nitems)
             throws BadLocationException

Removes some portion of the 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.

Throws:

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

getString

String getString(int where,
                 int len)
          throws BadLocationException

Fetches a string of characters contained in the sequence.

Parameters:

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

len - number of characters to copy >= 0.

Returns:

the string

Throws:

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

getChars

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

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

Parameters:

where - the starting offset >= 0

len - the number of characters >= 0

txt - the target location to copy into

Throws:

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