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Interface com.sun.java.swing.text.Document

public interface Document

Container for text that supports editing and provides notification of changes (serves as the model in an MVC relationship). Support is provided to mark up the text with structure that tracks changes. The unit of structure is called an element. Views will typically be built from an element structure. Each element can have an arbitrary set of attributes associated with it. The interface itself is intended to be free of any policy for structure that is provided, as the nature of the document structure should be determined by the implementation.

Typically there will be only one document structure, but the interface supports building an arbitrary number of structural projections over the text data. The document can have multiple root elements to support multiple document structures. Some examples might be:

• Logical document structure.
• View projections.
• Lexical token streams.
• Parse trees.
• Conversions to formats other than the native format.
• Modification specifications.
• Annotations.

See Also:

DocumentEvent, DocumentListener, Element, Position, AttributeSet

StreamDescriptionProperty

The property name for the description of the stream used to initialize the document.

TitleProperty

The property name for the title of the document, if there is one.

addDocumentListener(DocumentListener)

Registers the given observer to begin receiving notifications when changes are made to the document.

createPosition(int)

Returns a position that will track change as the document is altered.

getDefaultRootElement()

Returns the root element that views should be based upon unless some other mechanism for assigning views to element structures is provided.

getEndPosition()

Returns a position that represents the end of the document.

getLength()

Returns number of characters of content currently in the document.

getProperty(Object)

Gets properties associated with the document.

getRootElements()

Returns all of the root elements defined.

getStartPosition()

Returns a position that represents the start of the document.

getText(int, int)

Fetches the text contained within the given portion of the document.

getText(int, int, Segment)

Fetches the text contained within the given portion of the document.

insertString(int, String, AttributeSet)

Inserts a string of content.

putProperty(Object, Object)

Puts a new property on the list.

remove(int, int)

Removes a portion of the content of the document.

removeDocumentListener(DocumentListener)

Unregisters the given observer from the notification list so it will no longer receive change updates.

 public static final String StreamDescriptionProperty

The property name for the description of the stream used to initialize the document. This should be used if the document was initialized from a stream and anything is known about the stream.

 public static final String TitleProperty

The property name for the title of the document, if there is one.

 public abstract int getLength()

Returns number of characters of content currently in the document.

Returns:

number of characters

 public abstract void addDocumentListener(DocumentListener listener)

Registers the given observer to begin receiving notifications when changes are made to the document.

Parameters:

listener - the observer to register

See Also:

removeDocumentListener

 public abstract void removeDocumentListener(DocumentListener listener)

Unregisters the given observer from the notification list so it will no longer receive change updates.

Parameters:

listener - the observer to register

See Also:

addDocumentListener

 public abstract Object getProperty(Object key)

Gets properties associated with the document. Allows one to store things like the document title, author, etc.

Parameters:

key - a property

Returns:

the properties

 public abstract void putProperty(Object key,
                                  Object value)

Puts a new property on the list.

Parameters:

key - the property key

value - the property value

 public abstract void remove(int offs,
                             int len) throws BadLocationException

Removes a portion of the content of the document. This will cause notification to be sent to the observers of the document (unless an exception is thrown).

Parameters:

offs - the offset from the begining

len - the number of characters to remove

Throws: BadLocationException

some portion of the removal range was not a valid part of the document. The location in the exception is the first bad position encountered.

See Also:

DocumentEvent, DocumentListener

 public abstract void insertString(int offset,
                                   String str,
                                   AttributeSet a) throws BadLocationException

Inserts a string of content. This will cause the observers of the the document to be notified, unless an exception is thrown. A position marks a location in the document between items. If the attributes that have been defined exactly match the current attributes defined at the position, the element representing the content at that position will simply be expanded. If the attributes defined are different, a new content element will be created that matches the attributes.

Parameters:

offset - the offset into the document to insert the content. All positions that track change at or after the given location will move.

str - the string to insert

a - the attributes to associate with the inserted content. This may be null if there are no attributes.

Throws: BadLocationException

the given insert position is not a valid position within the document

See Also:

DocumentEvent, DocumentListener

 public abstract String getText(int offset,
                                int length) throws BadLocationException

Fetches the text contained within the given portion of the document.

Parameters:

offset - the offset into the document representing the desired start of the text

length - the length of the desired string

Returns:

the text

Throws: BadLocationException

some portion of the given range was not a valid part of the document. The location in the exception is the first bad position encountered.

 public abstract void getText(int offset,
                              int length,
                              Segment txt) throws BadLocationException

Fetches the text contained within the given portion of the document.

Parameters:

offset - the offset into the document representing the desired start of the text

length - the length of the desired string

txt - the Segment object to return the text in

Throws: BadLocationException

Some portion of the given range was not a valid part of the document. The location in the exception is the first bad position encountered.

 public abstract Position getStartPosition()

Returns a position that represents the start of the document. The position returned can be counted on to track change and stay located at the beginning of the document.

Returns:

the position

 public abstract Position getEndPosition()

Returns a position that represents the end of the document. The position returned can be counted on to track change and stay located at the end of the document.

Returns:

the position

 public abstract Position createPosition(int offs) throws BadLocationException

Returns a position that will track change as the document is altered. If the relative position pos is null, the start of the document will be used.

Parameters:

offs - the offset from the start of the document

Returns:

the position

Throws: BadLocationException

if the given position does not represent a valid location in the associated document

 public abstract Element[] getRootElements()

Returns all of the root elements defined.

Returns:

the root element

 public abstract Element getDefaultRootElement()

Returns the root element that views should be based upon unless some other mechanism for assigning views to element structures is provided.

Returns:

the root element

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