gnu.xml.dom
Class DomNode

java.lang.Object
  extended bygnu.xml.dom.DomNode
All Implemented Interfaces:
java.lang.Cloneable, org.w3c.dom.events.DocumentEvent, org.w3c.dom.events.EventTarget, org.w3c.dom.Node, org.w3c.dom.NodeList
Direct Known Subclasses:
DomCharacterData, DomDocument, DomEntityReference, DomExtern, DomFragment, DomNsNode, DomPI

public abstract class DomNode
extends java.lang.Object
implements org.w3c.dom.Node, org.w3c.dom.NodeList, org.w3c.dom.events.EventTarget, org.w3c.dom.events.DocumentEvent, java.lang.Cloneable

"Node", "EventTarget", and "DocumentEvent" implementation. This provides most of the core DOM functionality; only more specialized features are provided by subclasses. Those subclasses may have some particular constraints they must implement, by overriding methods defined here. Such constraints are noted here in the method documentation.

Note that you can create events with type names prefixed with "USER-", and pass them through this DOM. This lets you use the DOM event scheme for application specific purposes, although you must use a predefined event structure (such as MutationEvent) to pass data along with those events. Test for existence of this feature with the "USER-Events" DOM feature name.

Other kinds of events you can send include the "html" events, like "load", "unload", "abort", "error", and "blur"; and the mutation events. If this DOM has been compiled with mutation event support enabled, it will send mutation events when you change parts of the tree; otherwise you may create and send such events yourself, but they won't be generated by the DOM itself.

Note that there is a namespace-aware name comparison method, nameAndTypeEquals, which compares the names (and types) of two nodes in conformance with the "Namespaces in XML" specification. While mostly intended for use with elements and attributes, this should also be helpful for ProcessingInstruction nodes and some others which do not have namespace URIs.

Version:
$Date: 2001/11/21 01:53:41 $
Author:
David Brownell

Field Summary
 
Fields inherited from interface org.w3c.dom.Node
ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_FRAGMENT_NODE, DOCUMENT_NODE, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, NOTATION_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE
 
Constructor Summary
protected DomNode(org.w3c.dom.Document owner)
          Constructs a node and associates it with its owner.
 
Method Summary
 void addEventListener(java.lang.String type, org.w3c.dom.events.EventListener listener, boolean useCapture)
          DOM L2 (Events) Registers an event listener's interest in a class of events.
 org.w3c.dom.Node appendChild(org.w3c.dom.Node newChild)
          DOM L1 Appends the specified node to this node's list of children.
 java.lang.Object clone()
          Clones this node; roughly equivalent to cloneNode(false).
 org.w3c.dom.Node cloneNode(boolean deep)
          DOM L1 Returns a clone of this node which optionally includes cloned versions of child nodes.
 void compact()
          Reduces space utilization for this node.
 org.w3c.dom.events.Event createEvent(java.lang.String eventType)
          DOM L2 (Events) Returns an instance of the specified type of event object.
 boolean dispatchEvent(org.w3c.dom.events.Event event)
          DOM L2 (Events) Delivers an event to all relevant listeners, returning true if the caller should perform their default action.
 org.w3c.dom.NamedNodeMap getAttributes()
          DOM L1 Returns null; Element subclasses must override this method.
 org.w3c.dom.NodeList getChildNodes()
          DOM L1 Returns a list, possibly empty, of the children of this node.
 org.w3c.dom.NodeList getElementsByTagName(java.lang.String tag)
          DOM L1 Creates a NodeList giving array-style access to elements with the specified name.
 org.w3c.dom.NodeList getElementsByTagNameNS(java.lang.String namespace, java.lang.String local)
          DOM L2 Creates a NodeList giving array-style access to elements with the specified namespace and local name.
 org.w3c.dom.Node getFirstChild()
          DOM L1 Returns the first child of this node, or null if there are none.
 org.w3c.dom.Node getLastChild()
          DOM L1 Returns the last child of this node, or null if there are none.
 int getLength()
          DOM L1 (NodeList) Returns the number of elements in this NodeList.
 java.lang.String getLocalName()
          DOM L2 Returns the node name; this must be overridden for element and attribute nodes.
 java.lang.String getNamespaceURI()
          DOM L2 Returns null; this must be overridden for element and attribute nodes.
 org.w3c.dom.Node getNextSibling()
          DOM L1 Returns the previous sibling, if one is known.
 java.lang.String getNodeValue()
          DOM L1 Returns null; this must be overridden for nodes types with a defined value, along with the setNodeValue method.
 org.w3c.dom.Document getOwnerDocument()
          DOM L1 (modified in L2) Returns the owner document.
 org.w3c.dom.Node getParentNode()
          DOM L1 Returns the parent node, if one is known.
 java.lang.String getPrefix()
          DOM L2 Returns null; this must be overridden for element and attribute nodes.
 org.w3c.dom.Node getPreviousSibling()
          DOM L1 Returns the previous sibling, if one is known.
 boolean hasAttributes()
          DOM L2> Returns true iff this is an element node with attributes.
 boolean hasChildNodes()
          DOM L1 Returns true if this node has children.
 org.w3c.dom.Node insertBefore(org.w3c.dom.Node newChild, org.w3c.dom.Node refChild)
          DOM L1 Inserts the specified node in this node's list of children.
 boolean isReadonly()
          Exposes the internal "readonly" flag.
 boolean isSupported(java.lang.String feature, java.lang.String version)
          DOM L2 Consults the DOM implementation to determine if the requested feature is supported.
 org.w3c.dom.Node item(int index)
          DOM L1 (NodeList) Returns the item with the specified index in this NodeList, else null.
 void makeReadonly()
          Sets the internal "readonly" flag so this subtree can't be changed.
 boolean nameAndTypeEquals(org.w3c.dom.Node other)
          Returns true iff node types match, and either (a) both nodes have no namespace and their getNodeName() values are the same, or (b) both nodes have the same getNamespaceURI() and same getLocalName() values.
 void normalize()
          DOM L1 (relocated in DOM L2) In this node and all contained nodes (including attributes if relevant) merge adjacent text nodes.
 org.w3c.dom.Node removeChild(org.w3c.dom.Node refChild)
          DOM L1 Removes the specified child from this node's list of children, or else reports an exception.
 void removeEventListener(java.lang.String type, org.w3c.dom.events.EventListener listener, boolean useCapture)
          DOM L2 (Events) Unregisters an event listener.
 org.w3c.dom.Node replaceChild(org.w3c.dom.Node newChild, org.w3c.dom.Node refChild)
          DOM L1 Replaces the specified node in this node's list of children.
 void setNodeValue(java.lang.String value)
          DOM L1 Does nothing; this must be overridden (along with the getNodeValue method) for nodes with a non-null defined value.
 void setPrefix(java.lang.String prefix)
          DOM L2 Does nothing; this must be overridden (along with the getPrefix method) for element and attribute nodes.
 void trimToSize()
          Minimize extra space consumed by this node to hold children and event listeners.
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.w3c.dom.Node
getNodeName, getNodeType
 

Constructor Detail

DomNode

protected DomNode(org.w3c.dom.Document owner)
Constructs a node and associates it with its owner. Only Document and DocumentType nodes may be created with no owner, and DocumentType nodes get an owner as soon as they are associated with a document.

Method Detail

compact

public void compact()
Reduces space utilization for this node.


getAttributes

public org.w3c.dom.NamedNodeMap getAttributes()
DOM L1 Returns null; Element subclasses must override this method.

Specified by:
getAttributes in interface org.w3c.dom.Node

hasAttributes

public boolean hasAttributes()
DOM L2> Returns true iff this is an element node with attributes.

Specified by:
hasAttributes in interface org.w3c.dom.Node

getChildNodes

public org.w3c.dom.NodeList getChildNodes()
DOM L1 Returns a list, possibly empty, of the children of this node. In this implementation, to conserve memory, nodes are the same as their list of children. This can have ramifications for subclasses, which may need to provide their own getLength method for reasons unrelated to the NodeList method of the same name.

Specified by:
getChildNodes in interface org.w3c.dom.Node

getFirstChild

public final org.w3c.dom.Node getFirstChild()
DOM L1 Returns the first child of this node, or null if there are none.

Specified by:
getFirstChild in interface org.w3c.dom.Node

getLastChild

public final org.w3c.dom.Node getLastChild()
DOM L1 Returns the last child of this node, or null if there are none.

Specified by:
getLastChild in interface org.w3c.dom.Node

hasChildNodes

public final boolean hasChildNodes()
DOM L1 Returns true if this node has children.

Specified by:
hasChildNodes in interface org.w3c.dom.Node

isReadonly

public final boolean isReadonly()
Exposes the internal "readonly" flag. In DOM, children of entities and entity references are readonly, as are the objects associated with DocumentType objets.


makeReadonly

public void makeReadonly()
Sets the internal "readonly" flag so this subtree can't be changed. Subclasses need to override this method for any associated content that's not a child node, such as an element's attributes or the (few) declarations associated with a DocumentType.


appendChild

public org.w3c.dom.Node appendChild(org.w3c.dom.Node newChild)
DOM L1 Appends the specified node to this node's list of children. Document subclasses must override this to enforce the restrictions that there be only one element and document type child.

Causes a DOMNodeInserted mutation event to be reported. Will first cause a DOMNodeRemoved event to be reported if the parameter already has a parent. If the new child is a document fragment node, both events will be reported for each child of the fragment; the order in which children are removed and inserted is implementation-specific.

If this DOM has been compiled without mutation event support, these events will not be reported.

Specified by:
appendChild in interface org.w3c.dom.Node

insertBefore

public org.w3c.dom.Node insertBefore(org.w3c.dom.Node newChild,
                                     org.w3c.dom.Node refChild)
DOM L1 Inserts the specified node in this node's list of children. Document subclasses must override this to enforce the restrictions that there be only one element and document type child.

Causes a DOMNodeInserted mutation event to be reported. Will first cause a DOMNodeRemoved event to be reported if the newChild parameter already has a parent. If the new child is a document fragment node, both events will be reported for each child of the fragment; the order in which children are removed and inserted is implementation-specific.

If this DOM has been compiled without mutation event support, these events will not be reported.

Specified by:
insertBefore in interface org.w3c.dom.Node

replaceChild

public org.w3c.dom.Node replaceChild(org.w3c.dom.Node newChild,
                                     org.w3c.dom.Node refChild)
DOM L1 Replaces the specified node in this node's list of children. Document subclasses must override this to test the restrictions that there be only one element and document type child.

Causes DOMNodeRemoved and DOMNodeInserted mutation event to be reported. Will cause another DOMNodeRemoved event to be reported if the newChild parameter already has a parent. These events may be delivered in any order, except that the event reporting removal from such an existing parent will always be delivered before the event reporting its re-insertion as a child of some other node. The order in which children are removed and inserted is implementation specific.

If your application needs to depend on the in which those removal and insertion events are delivered, don't use this API. Instead, invoke the removeChild and insertBefore methods directly, to guarantee a specific delivery order. Similarly, don't use document fragments, Otherwise your application code may not work on a DOM which implements this method differently.

If this DOM has been compiled without mutation event support, these events will not be reported.

Specified by:
replaceChild in interface org.w3c.dom.Node

removeChild

public org.w3c.dom.Node removeChild(org.w3c.dom.Node refChild)
DOM L1 Removes the specified child from this node's list of children, or else reports an exception.

Causes a DOMNodeRemoved mutation event to be reported.

If this DOM has been compiled without mutation event support, these events will not be reported.

Specified by:
removeChild in interface org.w3c.dom.Node

item

public final org.w3c.dom.Node item(int index)
DOM L1 (NodeList) Returns the item with the specified index in this NodeList, else null.

Specified by:
item in interface org.w3c.dom.NodeList

getLength

public int getLength()
DOM L1 (NodeList) Returns the number of elements in this NodeList. (Note that many interfaces have a "Length" property, not just NodeList, and if a node subtype must implement one of those, it will also need to override getChildNodes.)

Specified by:
getLength in interface org.w3c.dom.NodeList

trimToSize

public void trimToSize()
Minimize extra space consumed by this node to hold children and event listeners.


getNextSibling

public final org.w3c.dom.Node getNextSibling()
DOM L1 Returns the previous sibling, if one is known.

Specified by:
getNextSibling in interface org.w3c.dom.Node

getPreviousSibling

public final org.w3c.dom.Node getPreviousSibling()
DOM L1 Returns the previous sibling, if one is known.

Specified by:
getPreviousSibling in interface org.w3c.dom.Node

getParentNode

public final org.w3c.dom.Node getParentNode()
DOM L1 Returns the parent node, if one is known.

Specified by:
getParentNode in interface org.w3c.dom.Node

isSupported

public boolean isSupported(java.lang.String feature,
                           java.lang.String version)
DOM L2 Consults the DOM implementation to determine if the requested feature is supported. DocumentType subclasses must override this method, and associate themselves directly with the DOMImplementation node used. (This method relies on being able to access the DOMImplementation from the owner document, but DocumentType nodes can be created without an owner.)

Specified by:
isSupported in interface org.w3c.dom.Node

getOwnerDocument

public final org.w3c.dom.Document getOwnerDocument()
DOM L1 (modified in L2) Returns the owner document. This is only null for Document nodes, and (new in L2) for DocumentType nodes which have not yet been associated with the rest of their document.

Specified by:
getOwnerDocument in interface org.w3c.dom.Node

setNodeValue

public void setNodeValue(java.lang.String value)
DOM L1 Does nothing; this must be overridden (along with the getNodeValue method) for nodes with a non-null defined value.

Specified by:
setNodeValue in interface org.w3c.dom.Node

getNodeValue

public java.lang.String getNodeValue()
DOM L1 Returns null; this must be overridden for nodes types with a defined value, along with the setNodeValue method.

Specified by:
getNodeValue in interface org.w3c.dom.Node

setPrefix

public void setPrefix(java.lang.String prefix)
DOM L2 Does nothing; this must be overridden (along with the getPrefix method) for element and attribute nodes.

Specified by:
setPrefix in interface org.w3c.dom.Node

getPrefix

public java.lang.String getPrefix()
DOM L2 Returns null; this must be overridden for element and attribute nodes.

Specified by:
getPrefix in interface org.w3c.dom.Node

getNamespaceURI

public java.lang.String getNamespaceURI()
DOM L2 Returns null; this must be overridden for element and attribute nodes.

Specified by:
getNamespaceURI in interface org.w3c.dom.Node

getLocalName

public java.lang.String getLocalName()
DOM L2 Returns the node name; this must be overridden for element and attribute nodes.

Specified by:
getLocalName in interface org.w3c.dom.Node

cloneNode

public org.w3c.dom.Node cloneNode(boolean deep)
DOM L1 Returns a clone of this node which optionally includes cloned versions of child nodes. Clones are always mutable, except for entity reference nodes.

Specified by:
cloneNode in interface org.w3c.dom.Node

clone

public java.lang.Object clone()
Clones this node; roughly equivalent to cloneNode(false). Element subclasses must provide a new implementation which invokes this method to handle the basics, and then arranges to clone any element attributes directly. Attribute subclasses must make similar arrangements, ensuring that existing ties to elements are broken by cloning.


getElementsByTagName

public org.w3c.dom.NodeList getElementsByTagName(java.lang.String tag)
DOM L1 Creates a NodeList giving array-style access to elements with the specified name. Access is fastest if indices change by small values, and the DOM is not modified.


getElementsByTagNameNS

public org.w3c.dom.NodeList getElementsByTagNameNS(java.lang.String namespace,
                                                   java.lang.String local)
DOM L2 Creates a NodeList giving array-style access to elements with the specified namespace and local name. Access is fastest if indices change by small values, and the DOM is not modified.


createEvent

public org.w3c.dom.events.Event createEvent(java.lang.String eventType)
DOM L2 (Events) Returns an instance of the specified type of event object. Understands about DOM Mutation, HTML, and UI events.

If the name of the event type begins with "USER-", then an object implementing the "Event" class will be returned; this provides a limited facility for application-defined events to use the DOM event infrastructure. Alternatively, use one of the standard DOM event classes and initialize it using use such a "USER-" event type name; or defin, instantiate, and initialize an application-specific subclass of DomEvent and pass that to dispatchEvent().

Specified by:
createEvent in interface org.w3c.dom.events.DocumentEvent
Parameters:
eventType - Identifies the particular DOM feature module defining the type of event, such as "MutationEvents". The event "name" is a different kind of "type".

addEventListener

public final void addEventListener(java.lang.String type,
                                   org.w3c.dom.events.EventListener listener,
                                   boolean useCapture)
DOM L2 (Events) Registers an event listener's interest in a class of events.

Specified by:
addEventListener in interface org.w3c.dom.events.EventTarget

dispatchEvent

public final boolean dispatchEvent(org.w3c.dom.events.Event event)
                            throws org.w3c.dom.events.EventException
DOM L2 (Events) Delivers an event to all relevant listeners, returning true if the caller should perform their default action. Note that the event must have been provided by the createEvent() method on this class, else it can't be dispatched.

Specified by:
dispatchEvent in interface org.w3c.dom.events.EventTarget
Throws:
java.lang.NullPointerException - When a null event is passed.
java.lang.ClassCastException - When the event wasn't provided by the createEvent method, or otherwise isn't a DomEvent.
org.w3c.dom.events.EventException - If the event type wasn't specified
See Also:
createEvent(java.lang.String)

removeEventListener

public final void removeEventListener(java.lang.String type,
                                      org.w3c.dom.events.EventListener listener,
                                      boolean useCapture)
DOM L2 (Events) Unregisters an event listener.

Specified by:
removeEventListener in interface org.w3c.dom.events.EventTarget

normalize

public void normalize()
DOM L1 (relocated in DOM L2) In this node and all contained nodes (including attributes if relevant) merge adjacent text nodes. This is done while ignoring text which happens to use CDATA delimiters).

Specified by:
normalize in interface org.w3c.dom.Node

nameAndTypeEquals

public boolean nameAndTypeEquals(org.w3c.dom.Node other)
Returns true iff node types match, and either (a) both nodes have no namespace and their getNodeName() values are the same, or (b) both nodes have the same getNamespaceURI() and same getLocalName() values.

Note that notion of a "Per-Element-Type" attribute name scope, as found in a non-normative appendix of the XML Namespaces specification, is not supported here. Your application must implement that notion, typically by not bothering to check nameAndTypeEquals for attributes without namespace URIs unless you already know their elements are nameAndTypeEquals.



Source code is under GPL (with library exception) in the JAXP project at http://www.gnu.org/software/classpathx/jaxp
This documentation was derived from that source code on 2008-04-13.