Module java.desktop
Package javax.swing.text

# Class DefaultStyledDocument

java.lang.Object
javax.swing.text.AbstractDocument
javax.swing.text.DefaultStyledDocument

All Implemented Interfaces:
  `Serializable`, `Document`, `StyledDocument`

Direct Known Subclasses:
  `HTMLDocument`

public class DefaultStyledDocument extends AbstractDocument implements StyledDocument
A document that can be marked up with character and paragraph styles in a manner similar to the Rich Text Format. The element structure for this document represents style crossings for style runs. These style runs are mapped into a paragraph element structure (which may reside in some other structure). The style runs break at paragraph boundaries since logical styles are assigned to paragraph boundaries.

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. As of 1.4, support for long term storage of all JavaBeans has been added to the `java.beans` package. Please see `XMLEncoder`.

See Also:
  - `Document`
  - `AbstractDocument`

## Nested Class Summary

Nested Classes
Modifier and Type
Class
Description
`static class`
`DefaultStyledDocument.AttributeUndoableEdit`
An UndoableEdit used to remember AttributeSet changes to an Element.
`class`
`DefaultStyledDocument.ElementBuffer`
Class to manage changes to the element hierarchy.
`static class`
`DefaultStyledDocument.ElementSpec`
Specification for building elements.
`protected class`
`DefaultStyledDocument.SectionElement`
Default root element for a document... maps out the paragraphs/lines contained.

## Nested classes/interfaces declared in class javax.swing.text.AbstractDocument

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

## Field Summary

Fields
Modifier and Type
Field
Description
`protected DefaultStyledDocument.ElementBuffer`
`buffer`
The element buffer.
`static final int`
`BUFFER_SIZE_DEFAULT`
The default size of the initial content buffer.

### Fields declared in class javax.swing.text.AbstractDocument

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

### Fields declared in interface javax.swing.text.Document

`StreamDescriptionProperty, TitleProperty`

## Constructor Summary

Constructors
Constructor
Description
`DefaultStyledDocument()`
Constructs a default styled document.
`DefaultStyledDocument(AbstractDocument.Content c, StyleContext styles)`
Constructs a styled document.
`DefaultStyledDocument(StyleContext styles)`
Constructs a styled document with the default content storage implementation and a shared set of styles.

## Method Summary

Modifier and Type
Method
Description
`void`
`addDocumentListener(DocumentListener listener)`
Adds a document listener for notification of any changes.
`Style`
`addStyle(String nm, Style parent)`
Adds a new style into the logical style hierarchy.
`protected void`
`create(DefaultStyledDocument.ElementSpec[] data)`
Initialize the document to reflect the given element structure (i.e. the structure reported by the `getDefaultRootElement` method.
`protected AbstractDocument.AbstractElement`
`createDefaultRoot()`
Creates the root element to be used to represent the default document structure.
`Color`
`getBackground(AttributeSet attr)`
Gets the background color from an attribute set.
`Element`
`getCharacterElement(int pos)`
Gets a character element based on a position.
`Element`
`getDefaultRootElement()`
Gets the default root element.
`Font`
`getFont(AttributeSet attr)`
Gets the font from an attribute set.
`Color`
`getForeground(AttributeSet attr)`
Gets the foreground color from an attribute set.
`Style`
`getLogicalStyle(int p)`
Fetches the logical style assigned to the paragraph represented by the given position.
`Element`
`getParagraphElement(int pos)`
Gets the paragraph element at the offset `pos`.
`Style`
`getStyle(String nm)`
Fetches a named style previously added.
`Enumeration<?>`
`getStyleNames()`
Fetches the list of style names.
`protected void`
`insert(int offset, DefaultStyledDocument.ElementSpec[] data)`
Inserts new elements in bulk.
`protected void`
`insertUpdate(AbstractDocument.DefaultDocumentEvent chng, AttributeSet attr)`
Updates document structure as a result of text insertion.
`void`
`removeDocumentListener(DocumentListener listener)`
Removes a document listener.
`void`
`removeElement(Element elem)`
Removes an element from this document.
`void`
`removeStyle(String nm)`
Removes a named style previously added to the document.
`protected void`
`removeUpdate(AbstractDocument.DefaultDocumentEvent chng)`
Updates document structure as a result of text removal.
`void`
`setCharacterAttributes(int offset, int length, AttributeSet s, boolean replace)`
Sets attributes for some part of the document.
`void`
`setLogicalStyle(int pos, Style s)`
Sets the logical style to use for the paragraph at the given position.
`void`
`setParagraphAttributes(int offset, int length, AttributeSet s, boolean replace)`
Sets attributes for a paragraph.
`protected void`
`styleChanged(Style style)`
Called when any of this document's styles have changed.

### Methods declared in class javax.swing.text.AbstractDocument

`addUndoableEditListener, createBranchElement, createLeafElement, createPosition, dump, fireChangedUpdate, fireInsertUpdate, fireRemoveUpdate, fireUndoableEditUpdate, getAsynchronousLoadPriority, getAttributeContext, getBidiRootElement, getContent, getCurrentWriter, getDocumentFilter, getDocumentListeners, getDocumentProperties, getEndPosition, getLength, getListeners, getProperty, getRootElements, getStartPosition, getText, getText, getUndoableEditListeners, insertString, postRemoveUpdate, putProperty, readLock, readUnlock, remove, removeUndoableEditListener, render, replace, setAsynchronousLoadPriority, setDocumentFilter, setDocumentProperties, writeLock, writeUnlock`

### Methods declared in class java.lang.Object

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

### Methods declared in interface javax.swing.text.Document

`addUndoableEditListener, createPosition, getEndPosition, getLength, getProperty, getRootElements, getStartPosition, getText, getText, insertString, putProperty, remove, removeUndoableEditListener, render`

## Field Details

### BUFFER_SIZE_DEFAULT

public static final int BUFFER_SIZE_DEFAULT
The default size of the initial content buffer.

See Also:
  - Constant Field Values

### buffer

protected DefaultStyledDocument.ElementBuffer buffer
The element buffer.

## Constructor Details

### DefaultStyledDocument

public DefaultStyledDocument(AbstractDocument.Content c, StyleContext styles)
Constructs a styled document.

Parameters:
  `c` - the container for the content
  `styles` - resources and style definitions which may be shared across documents

### DefaultStyledDocument

public DefaultStyledDocument(StyleContext styles)
Constructs a styled document with the default content storage implementation and a shared set of styles.

Parameters:
  `styles` - the styles

### DefaultStyledDocument

public DefaultStyledDocument()
Constructs a default styled document. This buffers input content by a size of BUFFER_SIZE_DEFAULT and has a style context that is scoped by the lifetime of the document and is not shared with other documents.

## Method Details

### getDefaultRootElement

public Element getDefaultRootElement()
Gets the default root element.

Specified by:
  `getDefaultRootElement` in interface `Document`
Specified by:
  `getDefaultRootElement` in class `AbstractDocument`
Returns:
  the root
See Also:
  - `Document.getDefaultRootElement()`

### create

protected void create(DefaultStyledDocument.ElementSpec[] data)
Initialize the document to reflect the given element structure (i.e. the structure reported by the `getDefaultRootElement` method. If the document contained any data it will first be removed.

Parameters:
  `data` - the element data

### insert

protected void insert(int offset, DefaultStyledDocument.ElementSpec[] data) throws BadLocationException
Inserts new elements in bulk. This is useful to allow parsing with the document in an unlocked state and prepare an element structure modification. This method takes an array of tokens that describe how to update an element structure so the time within a write lock can be greatly reduced in an asynchronous update situation.

This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.

Parameters:
  `offset` - the starting offset >= 0
  `data` - the element data
Throws:
  `BadLocationException` - for an invalid starting offset

### removeElement

public void removeElement(Element elem)
Removes an element from this document.

The element is removed from its parent element, as well as the text in the range identified by the element. If the element isn't associated with the document, `IllegalArgumentException` is thrown.

As empty branch elements are not allowed in the document, if the element is the sole child, its parent element is removed as well, recursively. This means that when replacing all the children of a particular element, new children should be added before removing old children.

Element removal results in two events being fired, the `DocumentEvent` for changes in element structure and `UndoableEditEvent` for changes in document content.

If the element contains end-of-content mark (the last `"\n"` character in document), this character is not removed; instead, preceding leaf element is extended to cover the character. If the last leaf already ends with `"\n",` it is included in content removal.

If the element is `null,` `NullPointerException` is thrown. If the element structure would become invalid after the removal, for example if the element is the document root element, `IllegalArgumentException` is thrown. If the current element structure is invalid, `IllegalStateException` is thrown.

Parameters:
  `elem` - the element to remove
Throws:
  `NullPointerException` - if the element is `null`
  `IllegalArgumentException` - if the element could not be removed
  `IllegalStateException` - if the element structure is invalid
Since:
  1.7

### addStyle

public Style addStyle(String nm, Style parent)
Adds a new style into the logical style hierarchy. Style attributes resolve from bottom up so an attribute specified in a child will override an attribute specified in the parent.

Specified by:
  `addStyle` in interface `StyledDocument`
Parameters:
  `nm` - the name of the style (must be unique within the collection of named styles). The name may be null if the style is unnamed, but the caller is responsible for managing the reference returned as an unnamed style can't be fetched by name. An unnamed style may be useful for things like character attribute overrides such as found in a style run.
  `parent` - the parent style. This may be null if unspecified attributes need not be resolved in some other style.
Returns:
  the style

### removeStyle

public void removeStyle(String nm)
Removes a named style previously added to the document.

Specified by:
  `removeStyle` in interface `StyledDocument`
Parameters:
  `nm` - the name of the style to remove

### getStyle

public Style getStyle(String nm)
Fetches a named style previously added.

Specified by:
  `getStyle` in interface `StyledDocument`
Parameters:
  `nm` - the name of the style
Returns:
  the style

### getStyleNames

public Enumeration<?> getStyleNames()
Fetches the list of style names.

Returns:
  all the style names

### setLogicalStyle

public void setLogicalStyle(int pos, Style s)
Sets the logical style to use for the paragraph at the given position. If attributes aren't explicitly set for character and paragraph attributes they will resolve through the logical style assigned to the paragraph, which in turn may resolve through some hierarchy completely independent of the element hierarchy in the document.

This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.

Specified by:
  `setLogicalStyle` in interface `StyledDocument`
Parameters:
  `pos` - the offset from the start of the document >= 0
  `s` - the logical style to assign to the paragraph, null if none

### getLogicalStyle

public Style getLogicalStyle(int p)
Fetches the logical style assigned to the paragraph represented by the given position.

Specified by:
  `getLogicalStyle` in interface `StyledDocument`
Parameters:
  `p` - the location to translate to a paragraph and determine the logical style assigned >= 0. This is an offset from the start of the document.
Returns:
  the style, null if none

### setCharacterAttributes

public void setCharacterAttributes(int offset, int length, AttributeSet s, boolean replace)
Sets attributes for some part of the document. A write lock is held by this operation while changes are being made, and a DocumentEvent is sent to the listeners after the change has been successfully completed.

`offset` and `length` define the range of the text over which the attributes are set. If the length is <= 0, then no action is taken and the method just returns. If the offset is <=0 or > the length of the text then no action is taken, and the method just returns. Otherwise if `offset + length` will exceed the length of the text then the affected range is truncated.

This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.

Specified by:
  `setCharacterAttributes` in interface `StyledDocument`
Parameters:
  `offset` - the offset in the document >= 0
  `length` - the length > 0
  `s` - the attributes
  `replace` - true if the previous attributes should be replaced before setting the new attributes

### setParagraphAttributes

public void setParagraphAttributes(int offset, int length, AttributeSet s, boolean replace)
Sets attributes for a paragraph.

This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.

Specified by:
  `setParagraphAttributes` in interface `StyledDocument`
Parameters:
  `offset` - the offset into the paragraph >= 0
  `length` - the number of characters affected >= 0
  `s` - the attributes
  `replace` - whether to replace existing attributes, or merge them

### getParagraphElement

public Element getParagraphElement(int pos)
Gets the paragraph element at the offset `pos`. A paragraph consists of at least one child Element, which is usually a leaf.

Specified by:
  `getParagraphElement` in interface `StyledDocument`
Specified by:
  `getParagraphElement` in class `AbstractDocument`
Parameters:
  `pos` - the starting offset >= 0
Returns:
  the element

### getCharacterElement

public Element getCharacterElement(int pos)
Gets a character element based on a position.

Specified by:
  `getCharacterElement` in interface `StyledDocument`
Parameters:
  `pos` - the position in the document >= 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. This implementation simply parses the inserted content for line breaks and builds up a set of instructions for the element buffer.

Overrides:
  `insertUpdate` in class `AbstractDocument`
Parameters:
  `chng` - a description of the document change
  `attr` - the attributes

### removeUpdate

protected void removeUpdate(AbstractDocument.DefaultDocumentEvent chng)
Updates document structure as a result of text removal.

Overrides:
  `removeUpdate` in class `AbstractDocument`
Parameters:
  `chng` - a description of the document change

### createDefaultRoot

protected AbstractDocument.AbstractElement createDefaultRoot()
Creates the root element to be used to represent the default document structure.

Returns:
  the element base

### getForeground

public Color getForeground(AttributeSet attr)
Gets the foreground color from an attribute set.

Specified by:
  `getForeground` in interface `StyledDocument`
Parameters:
  `attr` - the attribute set
Returns:
  the color

### getBackground

public Color getBackground(AttributeSet attr)
Gets the background color from an attribute set.

Specified by:
  `getBackground` in interface `StyledDocument`
Parameters:
  `attr` - the attribute set
Returns:
  the color

### getFont

public Font getFont(AttributeSet attr)
Gets the font from an attribute set.

Specified by:
  `getFont` in interface `StyledDocument`
Parameters:
  `attr` - the attribute set
Returns:
  the font

### styleChanged

protected void styleChanged(Style style)
Called when any of this document's styles have changed. Subclasses may wish to be intelligent about what gets damaged.

Parameters:
  `style` - The Style that has changed.

### addDocumentListener

public void addDocumentListener(DocumentListener listener)
Adds a document listener for notification of any changes.

Specified by:
  `addDocumentListener` in interface `Document`
Overrides:
  `addDocumentListener` in class `AbstractDocument`
Parameters:
  `listener` - the listener
See Also:
  - `Document.addDocumentListener(javax.swing.event.DocumentListener)`

### removeDocumentListener

public void removeDocumentListener(DocumentListener listener)
Removes a document listener.

Specified by:
  `removeDocumentListener` in interface `Document`
Overrides:
  `removeDocumentListener` in class `AbstractDocument`
Parameters:
  `listener` - the listener
See Also:
  - `Document.removeDocumentListener(javax.swing.event.DocumentListener)`