Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Interface AbstractDocument.Content - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
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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

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

public 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

public int length()

Current length of the sequence of character content.

Returns:: the length >= 0

insertString

public 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 mechansim, 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.

remove

public 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 mechansim, 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

public 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

public 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.