javax.swing.text
Class AbstractDocument.AbstractElement

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

All Implemented Interfaces:

AttributeSet, Element, MutableAttributeSet, Serializable, TreeNode

Direct Known Subclasses:

AbstractDocument.BranchElement, AbstractDocument.LeafElement

Enclosing class:

AbstractDocument

public abstract class AbstractDocument.AbstractElement

extends Object

implements Element, MutableAttributeSet, Serializable, TreeNode

Implements the abstract part of an element. By default elements support attributes by having a field that represents the immutable part of the current attribute set for the element. The element itself implements MutableAttributeSet which can be used to modify the set by fetching a new immutable set. The immutable sets are provided by the AttributeContext associated with the document.

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^TM has been added to the java.beans package. Please see XMLEncoder.

See Also:

Serialized Form

Nested Class Summary

Nested classes inherited from class javax.swing.text.AttributeSet

AttributeSet.CharacterAttribute, AttributeSet.ColorAttribute, AttributeSet.FontAttribute, AttributeSet.ParagraphAttribute

Field Summary

private AttributeSet	attributes
private Element	parent

Fields inherited from interface javax.swing.text.AttributeSet

NameAttribute, ResolveAttribute

Constructor Summary

AbstractDocument.AbstractElement(Element parent, AttributeSet a)
Creates a new AbstractElement.

Method Summary

void	addAttribute(Object name, Object value) Adds an attribute to the element.
void	addAttributes(AttributeSet attr) Adds a set of attributes to the element.
private void	checkForIllegalCast()
abstract Enumeration	children() Returns the children of the receiver as an Enumeration.
boolean	containsAttribute(Object name, Object value) Checks whether a given attribute name/value is defined.
boolean	containsAttributes(AttributeSet attrs) Checks whether the element contains all the attributes.
AttributeSet	copyAttributes() Copies a set of attributes.
void	dump(PrintStream psOut, int indentAmount) Dumps a debugging representation of the element hierarchy.
abstract boolean	getAllowsChildren() Returns true if the receiver allows children.
Object	getAttribute(Object attrName) Gets the value of an attribute.
int	getAttributeCount() Gets the number of attributes that are defined.
Enumeration	getAttributeNames() Gets the names of all attributes.
AttributeSet	getAttributes() Gets the attributes for the element.
TreeNode	getChildAt(int childIndex) Returns the child TreeNode at index childIndex.
int	getChildCount() Returns the number of children TreeNode's receiver contains.
Document	getDocument() Retrieves the underlying model.
abstract Element	getElement(int index) Gets a child element.
abstract int	getElementCount() Gets the number of children for the element.
abstract int	getElementIndex(int offset) Gets the child element index closest to the given model offset.
abstract int	getEndOffset() Gets the ending offset in the model for the element.
int	getIndex(TreeNode node) Returns the index of node in the receivers children.
String	getName() Gets the name of the element.
TreeNode	getParent() Returns the parent TreeNode of the receiver.
Element	getParentElement() Gets the parent of the element.
AttributeSet	getResolveParent() Gets the resolving parent.
abstract int	getStartOffset() Gets the starting offset in the model for the element.
private void	indent(PrintWriter out, int n)
boolean	isDefined(Object attrName) Checks whether a given attribute is defined.
boolean	isEqual(AttributeSet attr) Checks whether two attribute sets are equal.
abstract boolean	isLeaf() Checks whether the element is a leaf.
private void	readObject(ObjectInputStream s)
void	removeAttribute(Object name) Removes an attribute from the set.
void	removeAttributes(AttributeSet attrs) Removes a set of attributes for the element.
void	removeAttributes(Enumeration names) Removes a set of attributes for the element.
void	setResolveParent(AttributeSet parent) Sets the resolving parent.
private void	writeObject(ObjectOutputStream s)

Methods inherited from class java.lang.Object

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

Field Detail

parent

private Element parent

attributes

private transient AttributeSet attributes

Constructor Detail

AbstractDocument.AbstractElement

public AbstractDocument.AbstractElement(Element parent,
                                        AttributeSet a)

Creates a new AbstractElement.

Parameters:

parent - the parent element

a - the attributes for the element

Method Detail

indent

private final void indent(PrintWriter out,
                          int n)

dump

public void dump(PrintStream psOut,
                 int indentAmount)

Dumps a debugging representation of the element hierarchy.

Parameters:

psOut - the output stream

indentAmount - the indentation level >= 0

getAttributeCount

public int getAttributeCount()

Gets the number of attributes that are defined.

Specified by:

getAttributeCount in interface AttributeSet

Returns:

the number of attributes >= 0

See Also:

AttributeSet.getAttributeCount()

isDefined

public boolean isDefined(Object attrName)

Checks whether a given attribute is defined.

Specified by:

isDefined in interface AttributeSet

Parameters:

attrName - the non-null attribute name

Returns:

true if the attribute is defined

See Also:

AttributeSet.isDefined(java.lang.Object)

isEqual

public boolean isEqual(AttributeSet attr)

Checks whether two attribute sets are equal.

Specified by:

isEqual in interface AttributeSet

Parameters:

attr - the attribute set to check against

Returns:

true if the same

See Also:

AttributeSet.isEqual(javax.swing.text.AttributeSet)

copyAttributes

public AttributeSet copyAttributes()

Copies a set of attributes.

Specified by:

copyAttributes in interface AttributeSet

Returns:

the copy

See Also:

AttributeSet.copyAttributes()

getAttribute

public Object getAttribute(Object attrName)

Gets the value of an attribute.

Specified by:

getAttribute in interface AttributeSet

Parameters:

attrName - the non-null attribute name

Returns:

the attribute value

See Also:

AttributeSet.getAttribute(java.lang.Object)

getAttributeNames

public Enumeration getAttributeNames()

Gets the names of all attributes.

Specified by:

getAttributeNames in interface AttributeSet

Returns:

the attribute names as an enumeration

See Also:

AttributeSet.getAttributeNames()

containsAttribute

public boolean containsAttribute(Object name,
                                 Object value)

Checks whether a given attribute name/value is defined.

Specified by:

containsAttribute in interface AttributeSet

Parameters:

name - the non-null attribute name

value - the attribute value

Returns:

true if the name/value is defined

See Also:

AttributeSet.containsAttribute(java.lang.Object, java.lang.Object)

containsAttributes

public boolean containsAttributes(AttributeSet attrs)

Checks whether the element contains all the attributes.

Specified by:

containsAttributes in interface AttributeSet

Parameters:

attrs - the attributes to check

Returns:

true if the element contains all the attributes

See Also:

AttributeSet.containsAttributes(javax.swing.text.AttributeSet)

getResolveParent

public AttributeSet getResolveParent()

Gets the resolving parent. If not overridden, the resolving parent defaults to the parent element.

Specified by:

getResolveParent in interface AttributeSet

Returns:

the attributes from the parent, null if none

See Also:

AttributeSet.getResolveParent()

addAttribute

public void addAttribute(Object name,
                         Object value)

Adds an attribute to the element.

Specified by:

addAttribute in interface MutableAttributeSet

Parameters:

name - the non-null attribute name

value - the attribute value

See Also:

MutableAttributeSet.addAttribute(java.lang.Object, java.lang.Object)

addAttributes

public void addAttributes(AttributeSet attr)

Adds a set of attributes to the element.

Specified by:

addAttributes in interface MutableAttributeSet

Parameters:

attr - the attributes to add

See Also:

MutableAttributeSet.addAttribute(java.lang.Object, java.lang.Object)

removeAttribute

public void removeAttribute(Object name)

Removes an attribute from the set.

Specified by:

removeAttribute in interface MutableAttributeSet

Parameters:

name - the non-null attribute name

See Also:

MutableAttributeSet.removeAttribute(java.lang.Object)

removeAttributes

public void removeAttributes(Enumeration names)

Removes a set of attributes for the element.

Specified by:

removeAttributes in interface MutableAttributeSet

Parameters:

names - the attribute names

See Also:

MutableAttributeSet.removeAttributes(java.util.Enumeration)

removeAttributes

public void removeAttributes(AttributeSet attrs)

Removes a set of attributes for the element.

Specified by:

removeAttributes in interface MutableAttributeSet

Parameters:

attrs - the attributes

See Also:

MutableAttributeSet.removeAttributes(java.util.Enumeration)

setResolveParent

public void setResolveParent(AttributeSet parent)

Sets the resolving parent.

Specified by:

setResolveParent in interface MutableAttributeSet

Parameters:

parent - the parent, null if none

See Also:

MutableAttributeSet.setResolveParent(javax.swing.text.AttributeSet)

checkForIllegalCast

private final void checkForIllegalCast()

getDocument

public Document getDocument()

Retrieves the underlying model.

Specified by:

getDocument in interface Element

Returns:

the model

getParentElement

public Element getParentElement()

Gets the parent of the element.

Specified by:

getParentElement in interface Element

Returns:

the parent

getAttributes

public AttributeSet getAttributes()

Gets the attributes for the element.

Specified by:

getAttributes in interface Element

Returns:

the attribute set

getName

public String getName()

Gets the name of the element.

Specified by:

getName in interface Element

Returns:

the name, null if none

getStartOffset

public abstract int getStartOffset()

Gets the starting offset in the model for the element.

Specified by:

getStartOffset in interface Element

Returns:

the offset >= 0

See Also:

Document, AbstractDocument

getEndOffset

public abstract int getEndOffset()

Gets the ending offset in the model for the element.

Specified by:

getEndOffset in interface Element

Returns:

the offset >= 0

See Also:

Document, AbstractDocument

getElement

public abstract Element getElement(int index)

Gets a child element.

Specified by:

getElement in interface Element

Parameters:

index - the child index, >= 0 && < getElementCount()

Returns:

the child element

getElementCount

public abstract int getElementCount()

Gets the number of children for the element.

Specified by:

getElementCount in interface Element

Returns:

the number of children >= 0

getElementIndex

public abstract int getElementIndex(int offset)

Gets the child element index closest to the given model offset.

Specified by:

getElementIndex in interface Element

Parameters:

offset - the offset >= 0

Returns:

the element index >= 0

isLeaf

public abstract boolean isLeaf()

Checks whether the element is a leaf.

Specified by:

isLeaf in interface Element

Returns:

true if a leaf

getChildAt

public TreeNode getChildAt(int childIndex)

Returns the child TreeNode at index childIndex.

Specified by:

getChildAt in interface TreeNode

getChildCount

public int getChildCount()

Returns the number of children TreeNode's receiver contains.

Specified by:

getChildCount in interface TreeNode

Returns:

the number of children TreeNodews's receiver contains

getParent

public TreeNode getParent()

Returns the parent TreeNode of the receiver.

Specified by:

getParent in interface TreeNode

Returns:

the parent TreeNode of the receiver

getIndex

public int getIndex(TreeNode node)

Returns the index of node in the receivers children. If the receiver does not contain node, -1 will be returned.

Specified by:

getIndex in interface TreeNode

Parameters:

node - the location of interest

Returns:

the index of node in the receiver's children, or -1 if absent

getAllowsChildren

public abstract boolean getAllowsChildren()

Returns true if the receiver allows children.

Specified by:

getAllowsChildren in interface TreeNode

Returns:

true if the receiver allows children, otherwise false

children

public abstract Enumeration children()

Returns the children of the receiver as an Enumeration.

Specified by:

children in interface TreeNode

Returns:

the children of the receiver as an Enumeration

writeObject

private void writeObject(ObjectOutputStream s)
                  throws IOException

Throws:

IOException

readObject

private void readObject(ObjectInputStream s)
                 throws ClassNotFoundException,
                        IOException

Throws:

ClassNotFoundException

IOException