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javax.swing.text
Class PlainDocument

java.lang.Object
  |
  +--javax.swing.text.AbstractDocument
        |
        +--javax.swing.text.PlainDocument

public class PlainDocument

extends AbstractDocument

A plain document that maintains no character attributes. The default element structure for this document is a map of the lines in the text. The Element returned by getDefaultRootElement is a map of the lines, and each child element represents a line. This model does not maintain any character level attributes, but each line can be tagged with an arbitrary set of attributes. Line to offset, and offset to line translations can be quickly performed using the default root element. The structure information of the DocumentEvent's fired by edits will indicate the line structure changes.

The default content storage management is performed by a gapped buffer implementation (GapContent). It supports editing reasonably large documents with good efficiency when the edits are contiguous or clustered, as is typical.

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. A future release of Swing will provide support for long term persistence.

See Also:

Document, AbstractDocument, Serialized Form

Inner classes inherited from class javax.swing.text.AbstractDocument

AbstractDocument.AbstractElement, AbstractDocument.AttributeContext, AbstractDocument.BranchElement, AbstractDocument.Content, AbstractDocument.DefaultDocumentEvent, AbstractDocument.ElementEdit, AbstractDocument.LeafElement

Field Summary

static String	lineLimitAttribute Name of the attribute that specifies the maximum length of a line, if there is a maximum length.
static String	tabSizeAttribute Name of the attribute that specifies the tab size for tabs contained in the content.

Fields inherited from class javax.swing.text.AbstractDocument

BAD_LOCATION, BidiElementName, ContentElementName, ElementNameAttribute, listenerList, ParagraphElementName, SectionElementName

Constructor Summary

	PlainDocument() Constructs a plain text document.
protected	PlainDocument(AbstractDocument.Content c) Constructs a plain text document.

Method Summary

protected AbstractDocument.AbstractElement	createDefaultRoot() Creates the root element to be used to represent the default document structure.
Element	getDefaultRootElement() Gets the default root element for the document model.
Element	getParagraphElement(int pos) Get the paragraph element containing the given position.
protected void	insertUpdate(AbstractDocument.DefaultDocumentEvent chng, AttributeSet attr) Updates document structure as a result of text insertion.
protected void	removeUpdate(AbstractDocument.DefaultDocumentEvent chng) Updates any document structure as a result of text removal.

Methods inherited from class javax.swing.text.AbstractDocument

addDocumentListener, addUndoableEditListener, createBranchElement, createLeafElement, createPosition, dump, fireChangedUpdate, fireInsertUpdate, fireRemoveUpdate, fireUndoableEditUpdate, getAsynchronousLoadPriority, getAttributeContext, getBidiRootElement, getContent, getCurrentWriter, getDocumentProperties, getEndPosition, getLength, getProperty, getRootElements, getStartPosition, getText, getText, insertString, postRemoveUpdate, putProperty, readLock, readUnlock, remove, removeDocumentListener, removeUndoableEditListener, render, setAsynchronousLoadPriority, setDocumentProperties, writeLock, writeUnlock

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tabSizeAttribute

public static final String tabSizeAttribute

Name of the attribute that specifies the tab size for tabs contained in the content. The type for the value is Integer.

lineLimitAttribute

public static final String lineLimitAttribute

Name of the attribute that specifies the maximum length of a line, if there is a maximum length. The type for the value is Integer.

Constructor Detail

PlainDocument

public PlainDocument()

Constructs a plain text document. A default model using StringContent is constructed and set.

PlainDocument

protected PlainDocument(AbstractDocument.Content c)

Constructs a plain text document. A default root element is created, and the tab size set to 8.

Parameters:

c - the container for the content

Method Detail

getDefaultRootElement

public Element getDefaultRootElement()

Gets the default root element for the document model.

Overrides:

getDefaultRootElement in class AbstractDocument

Returns:

the root

See Also:

Document.getDefaultRootElement()

createDefaultRoot

protected AbstractDocument.AbstractElement createDefaultRoot()

Creates the root element to be used to represent the default document structure.

Returns:

the element base

getParagraphElement

public Element getParagraphElement(int pos)

Get the paragraph element containing the given position. Since this document only models lines, it returns the line instead.

Overrides:

getParagraphElement in class AbstractDocument

Tags copied from class: AbstractDocument

Parameters:

pos - the starting offset >= 0

Returns:

the element

insertUpdate

protected void insertUpdate(AbstractDocument.DefaultDocumentEvent chng,
                            AttributeSet attr)

Updates document structure as a result of text insertion. This will happen within a write lock. Since this document simply maps out lines, we refresh the line map.

Overrides:

insertUpdate in class AbstractDocument

Parameters:

chng - the change event describing the dit

attr - the set of attributes for the inserted text

removeUpdate

protected void removeUpdate(AbstractDocument.DefaultDocumentEvent chng)

Updates any document structure as a result of text removal. This will happen within a write lock. Since the structure represents a line map, this just checks to see if the removal spans lines. If it does, the two lines outside of the removal area are joined together.

Overrides:

removeUpdate in class AbstractDocument

Parameters:

chng - the change event describing the edit