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DocumentImpl.javaAPI DocJava SE 5 API50852Fri Aug 26 14:55:44 BST 2005com.sun.org.apache.xerces.internal.dom

DocumentImpl

public class DocumentImpl extends CoreDocumentImpl implements DocumentRange, DocumentTraversal, DocumentEvent
The Document interface represents the entire HTML or XML document. Conceptually, it is the root of the document tree, and provides the primary access to the document's data.

Since elements, text nodes, comments, processing instructions, etc. cannot exist outside the context of a Document, the Document interface also contains the factory methods needed to create these objects. The Node objects created have a ownerDocument attribute which associates them with the Document within whose context they were created.

The DocumentImpl class also implements the DOM Level 2 DocumentTraversal interface. This interface is comprised of factory methods needed to create NodeIterators and TreeWalkers. The process of creating NodeIterator objects also adds these references to this document. After finishing with an iterator it is important to remove the object using the remove methods in this implementation. This allows the release of the references from the iterator objects to the DOM Nodes.

Note: When any node in the document is serialized, the entire document is serialized along with it.

author
Arnaud Le Hors, IBM
author
Joe Kesselman, IBM
author
Andy Clark, IBM
author
Ralf Pfeiffer, IBM
version
$Id: DocumentImpl.java,v 1.78 2003/07/29 18:24:05 elena Exp $
since
PR-DOM-Level-1-19980818.

Fields Summary
static final long
serialVersionUID
Serialization version.
protected Vector
iterators
Iterators
protected Vector
ranges
Ranges
protected Hashtable
eventListeners
Table for event listeners registered to this document nodes.
protected boolean
mutationEvents
Bypass mutation events firing.
EnclosingAttr
savedEnclosingAttr
Constructors Summary
public DocumentImpl()
NON-DOM: Actually creating a Document is outside the DOM's spec, since it has to operate in terms of a particular implementation.


    //
    // Constructors
    //

                              
      
        super();
public DocumentImpl(boolean grammarAccess)
Constructor.

        super(grammarAccess);
public DocumentImpl(DocumentType doctype)
For DOM2 support. The createDocument factory method is in DOMImplementation.

        super(doctype);
public DocumentImpl(DocumentType doctype, boolean grammarAccess)
For DOM2 support.

        super(doctype, grammarAccess);
Methods Summary
protected voidaddEventListener(com.sun.org.apache.xerces.internal.dom.NodeImpl node, java.lang.String type, org.w3c.dom.events.EventListener listener, boolean useCapture)
Introduced in DOM Level 2.

Register an event listener with this Node. A listener may be independently registered as both Capturing and Bubbling, but may only be registered once per role; redundant registrations are ignored.

param
node node to add listener to
param
type Event name (NOT event group!) to listen for.
param
listener Who gets called when event is dispatched
param
useCapture True iff listener is registered on capturing phase rather than at-target or bubbling

        // We can't dispatch to blank type-name, and of course we need
        // a listener to dispatch to
        if (type == null || type.equals("") || listener == null)
            return;

        // Each listener may be registered only once per type per phase.
        // Simplest way to code that is to zap the previous entry, if any.
        removeEventListener(node, type, listener, useCapture);
	    
        Vector nodeListeners = getEventListeners(node);
        if(nodeListeners == null) {
            nodeListeners = new Vector();
            setEventListeners(node, nodeListeners);
        }
        nodeListeners.addElement(new LEntry(type, listener, useCapture));
	    
        // Record active listener
        LCount lc = LCount.lookup(type);
        if (useCapture)
            ++lc.captures;
        else
            ++lc.bubbles;
public org.w3c.dom.NodecloneNode(boolean deep)
Deep-clone a document, including fixing ownerDoc for the cloned children. Note that this requires bypassing the WRONG_DOCUMENT_ERR protection. I've chosen to implement it by calling importNode which is DOM Level 2.

return
org.w3c.dom.Node
param
deep boolean, iff true replicate children


        DocumentImpl newdoc = new DocumentImpl();
        callUserDataHandlers(this, newdoc, UserDataHandler.NODE_CLONED);
        cloneNode(newdoc, deep);

        // experimental
        newdoc.mutationEvents = mutationEvents;

    	return newdoc;
protected voidcopyEventListeners(com.sun.org.apache.xerces.internal.dom.NodeImpl src, com.sun.org.apache.xerces.internal.dom.NodeImpl tgt)

        Vector nodeListeners = getEventListeners(src);
	if (nodeListeners == null) {
	    return;
	}
	setEventListeners(tgt, (Vector) nodeListeners.clone());
public org.w3c.dom.events.EventcreateEvent(java.lang.String type)
Introduced in DOM Level 2. Optional.

Create and return Event objects.

param
type The eventType parameter specifies the type of Event interface to be created. If the Event interface specified is supported by the implementation this method will return a new Event of the interface type requested. If the Event is to be dispatched via the dispatchEvent method the appropriate event init method must be called after creation in order to initialize the Event's values. As an example, a user wishing to synthesize some kind of Event would call createEvent with the parameter "Events". The initEvent method could then be called on the newly created Event to set the specific type of Event to be dispatched and set its context information.
return
Newly created Event
exception
DOMException NOT_SUPPORTED_ERR: Raised if the implementation does not support the type of Event interface requested
since
WD-DOM-Level-2-19990923

	    if (type.equalsIgnoreCase("Events") || "Event".equals(type))
	        return new EventImpl();
	    if (type.equalsIgnoreCase("MutationEvents") ||
                "MutationEvent".equals(type))
	        return new MutationEventImpl();
	    else {
            String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NOT_SUPPORTED_ERR", null);
	        throw new DOMException(DOMException.NOT_SUPPORTED_ERR, msg);
        }
public org.w3c.dom.traversal.NodeIteratorcreateNodeIterator(org.w3c.dom.Node root, short whatToShow, org.w3c.dom.traversal.NodeFilter filter)
NON-DOM extension: Create and return a NodeIterator. The NodeIterator is added to a list of NodeIterators so that it can be removed to free up the DOM Nodes it references.

param
root The root of the iterator.
param
whatToShow The whatToShow mask.
param
filter The NodeFilter installed. Null means no filter.

        return createNodeIterator(root, whatToShow, filter, true);
public org.w3c.dom.traversal.NodeIteratorcreateNodeIterator(org.w3c.dom.Node root, int whatToShow, org.w3c.dom.traversal.NodeFilter filter, boolean entityReferenceExpansion)
Create and return a NodeIterator. The NodeIterator is added to a list of NodeIterators so that it can be removed to free up the DOM Nodes it references.

param
root The root of the iterator.
param
whatToShow The whatToShow mask.
param
filter The NodeFilter installed. Null means no filter.
param
entityReferenceExpansion true to expand the contents of EntityReference nodes
since
WD-DOM-Level-2-19990923

        
        if (root == null) {
                  String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NOT_SUPPORTED_ERR", null);
                  throw new DOMException(DOMException.NOT_SUPPORTED_ERR, msg);
        }

        NodeIterator iterator = new NodeIteratorImpl(this,
                                                     root,
                                                     whatToShow,
                                                     filter,
                                                     entityReferenceExpansion);
        if (iterators == null) {
            iterators = new Vector();
        }

        iterators.addElement(iterator);

        return iterator;
public org.w3c.dom.ranges.RangecreateRange()


        if (ranges == null) {
            ranges = new Vector();
        }

        Range range = new RangeImpl(this);

        ranges.addElement(range);

        return range;
public org.w3c.dom.traversal.TreeWalkercreateTreeWalker(org.w3c.dom.Node root, int whatToShow, org.w3c.dom.traversal.NodeFilter filter, boolean entityReferenceExpansion)
Create and return a TreeWalker.

param
root The root of the iterator.
param
whatToShow The whatToShow mask.
param
filter The NodeFilter installed. Null means no filter.
param
entityReferenceExpansion true to expand the contents of EntityReference nodes
since
WD-DOM-Level-2-19990923

    	if (root == null) {
            String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NOT_SUPPORTED_ERR", null);
            throw new DOMException(DOMException.NOT_SUPPORTED_ERR, msg);
        }
        return new TreeWalkerImpl(root, whatToShow, filter,
                                  entityReferenceExpansion);
public org.w3c.dom.traversal.TreeWalkercreateTreeWalker(org.w3c.dom.Node root, short whatToShow, org.w3c.dom.traversal.NodeFilter filter)
NON-DOM extension: Create and return a TreeWalker.

param
root The root of the iterator.
param
whatToShow The whatToShow mask.
param
filter The NodeFilter installed. Null means no filter.

        return createTreeWalker(root, whatToShow, filter, true);
voiddeletedText(com.sun.org.apache.xerces.internal.dom.NodeImpl node, int offset, int count)
A method to be called when some text was deleted from a text node, so that live objects can be notified.

        // notify ranges
        if (ranges != null) {
            int size = ranges.size();
            for (int i = 0; i != size; i++) {
                ((RangeImpl)ranges.elementAt(i)).receiveDeletedText(node,
                                                                offset, count);
            }
        }
protected voiddispatchAggregateEvents(com.sun.org.apache.xerces.internal.dom.NodeImpl node, com.sun.org.apache.xerces.internal.dom.DocumentImpl$EnclosingAttr ea)
NON-DOM INTERNAL: Convenience wrapper for calling dispatchAggregateEvents when the context was established by savedEnclosingAttr.

param
node node to dispatch to
param
ea description of Attr affected by current operation

        if (ea != null)
            dispatchAggregateEvents(node, ea.node, ea.oldvalue,
                                    MutationEvent.MODIFICATION);
        else
            dispatchAggregateEvents(node, null, null, (short) 0);
protected voiddispatchAggregateEvents(com.sun.org.apache.xerces.internal.dom.NodeImpl node, com.sun.org.apache.xerces.internal.dom.AttrImpl enclosingAttr, java.lang.String oldvalue, short change)
NON-DOM INTERNAL: Generate the "aggregated" post-mutation events DOMAttrModified and DOMSubtreeModified. Both of these should be issued only once for each user-requested mutation operation, even if that involves multiple changes to the DOM. For example, if a DOM operation makes multiple changes to a single Attr before returning, it would be nice to generate only one DOMAttrModified, and multiple changes over larger scope but within a recognizable single subtree might want to generate only one DOMSubtreeModified, sent to their lowest common ancestor.

To manage this, use the "internal" versions of insert and remove with MUTATION_LOCAL, then make an explicit call to this routine at the higher level. Some examples now exist in our code.

param
node The node to dispatch to
param
enclosingAttr The Attr node (if any) whose value has been changed as a result of the DOM operation. Null if none such.
param
oldValue The String value previously held by the enclosingAttr. Ignored if none such.
param
change Type of modification to the attr. See MutationEvent.attrChange

        // We have to send DOMAttrModified.
        NodeImpl owner = null;
        if (enclosingAttr != null) {
            LCount lc = LCount.lookup(MutationEventImpl.DOM_ATTR_MODIFIED);
            owner = (NodeImpl) enclosingAttr.getOwnerElement();
            if (lc.captures + lc.bubbles + lc.defaults > 0) {
                if (owner != null) {
                    MutationEventImpl me =  new MutationEventImpl();
                    me.initMutationEvent(MutationEventImpl.DOM_ATTR_MODIFIED,
                                         true, false, enclosingAttr,
                                         oldvalue,
                                         enclosingAttr.getNodeValue(),
                                         enclosingAttr.getNodeName(),
                                         change);
                    owner.dispatchEvent(me);
                }
            }
        }
        // DOMSubtreeModified gets sent to the lowest common root of a
        // set of changes. 
        // "This event is dispatched after all other events caused by the
        // mutation have been fired."
        LCount lc = LCount.lookup(MutationEventImpl.DOM_SUBTREE_MODIFIED);
        if (lc.captures + lc.bubbles + lc.defaults > 0) {
            MutationEvent me =  new MutationEventImpl();
            me.initMutationEvent(MutationEventImpl.DOM_SUBTREE_MODIFIED,
                                 true, false, null, null,
                                 null, null, (short) 0);

            // If we're within an Attr, DStM gets sent to the Attr
            // and to its owningElement. Otherwise we dispatch it
            // locally.
            if (enclosingAttr != null) {
                dispatchEvent(enclosingAttr, me);
                if (owner != null)
                    dispatchEvent(owner, me);
            }
            else
                dispatchEvent(node, me);
        }
protected booleandispatchEvent(com.sun.org.apache.xerces.internal.dom.NodeImpl node, org.w3c.dom.events.Event event)
Introduced in DOM Level 2.

Distribution engine for DOM Level 2 Events.

Event propagation runs as follows:

  1. Event is dispatched to a particular target node, which invokes this code. Note that the event's stopPropagation flag is cleared when dispatch begins; thereafter, if it has been set before processing of a node commences, we instead immediately advance to the DEFAULT phase.
  2. The node's ancestors are established as destinations for events. For capture and bubble purposes, node ancestry is determined at the time dispatch starts. If an event handler alters the document tree, that does not change which nodes will be informed of the event.
  3. CAPTURING_PHASE: Ancestors are scanned, root to target, for Capturing listeners. If found, they are invoked (see below).
  4. AT_TARGET: Event is dispatched to NON-CAPTURING listeners on the target node. Note that capturing listeners on this node are _not_ invoked.
  5. BUBBLING_PHASE: Ancestors are scanned, target to root, for non-capturing listeners.
  6. Default processing: Some DOMs have default behaviors bound to specific nodes. If this DOM does, and if the event's preventDefault flag has not been set, we now return to the target node and process its default handler for this event, if any.

Note that registration of handlers during processing of an event does not take effect during this phase of this event; they will not be called until the next time this node is visited by dispatchEvent. On the other hand, removals take effect immediately.

If an event handler itself causes events to be dispatched, they are processed synchronously, before processing resumes on the event which triggered them. Please be aware that this may result in events arriving at listeners "out of order" relative to the actual sequence of requests.

Note that our implementation resets the event's stop/prevent flags when dispatch begins. I believe the DOM's intent is that event objects be redispatchable, though it isn't stated in those terms.

param
node node to dispatch to
param
event the event object to be dispatched to registered EventListeners
return
true if the event's preventDefault() method was invoked by an EventListener; otherwise false.

        if (event == null) return false;
        
        // Can't use anyone else's implementation, since there's no public
        // API for setting the event's processing-state fields.
        EventImpl evt = (EventImpl)event;

        // VALIDATE -- must have been initialized at least once, must have
        // a non-null non-blank name.
        if(!evt.initialized || evt.type == null || evt.type.equals("")) {
            String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "UNSPECIFIED_EVENT_TYPE_ERR", null);
            throw new EventException(EventException.UNSPECIFIED_EVENT_TYPE_ERR, msg);
        }
        
        // If nobody is listening for this event, discard immediately
        LCount lc = LCount.lookup(evt.getType());
        if (lc.captures + lc.bubbles + lc.defaults == 0)
            return evt.preventDefault;

        // INITIALIZE THE EVENT'S DISPATCH STATUS
        // (Note that Event objects are reusable in our implementation;
        // that doesn't seem to be explicitly guaranteed in the DOM, but
        // I believe it is the intent.)
        evt.target = node;
        evt.stopPropagation = false;
        evt.preventDefault = false;
        
        // Capture pre-event parentage chain, not including target;
        // use pre-event-dispatch ancestors even if event handlers mutate
        // document and change the target's context.
        // Note that this is parents ONLY; events do not
        // cross the Attr/Element "blood/brain barrier". 
        // DOMAttrModified. which looks like an exception,
        // is issued to the Element rather than the Attr
        // and causes a _second_ DOMSubtreeModified in the Element's
        // tree.
        Vector pv = new Vector(10,10);
        Node p = node;
        Node n = p.getParentNode();
        while (n != null) {
            pv.addElement(n);
            p = n;
            n = n.getParentNode();
        }
        
        // CAPTURING_PHASE:
        if (lc.captures > 0) {
            evt.eventPhase = Event.CAPTURING_PHASE;
            // Ancestors are scanned, root to target, for 
            // Capturing listeners.
            for (int j = pv.size() - 1; j >= 0; --j) {
                if (evt.stopPropagation)
                    break;  // Someone set the flag. Phase ends.

                // Handle all capturing listeners on this node
                NodeImpl nn = (NodeImpl) pv.elementAt(j);
                evt.currentTarget = nn;
                Vector nodeListeners = getEventListeners(nn);
                if (nodeListeners != null) {
                    Vector nl = (Vector) nodeListeners.clone();
                    // call listeners in the order in which they got registered
                    int nlsize = nl.size();
                    for (int i = 0; i < nlsize; i++) {
                        LEntry le = (LEntry) nl.elementAt(i);
                        if (le.useCapture && le.type.equals(evt.type) &&
                            nodeListeners.contains(le)) {
                            try {
                                le.listener.handleEvent(evt);
                            }
                            catch (Exception e) {
                                // All exceptions are ignored.
                            }
                        }
                    }
                }
            }
        }
        
        // Both AT_TARGET and BUBBLE use non-capturing listeners.
        if (lc.bubbles > 0) {
            // AT_TARGET PHASE: Event is dispatched to NON-CAPTURING listeners
            // on the target node. Note that capturing listeners on the target
            // node are _not_ invoked, even during the capture phase.
            evt.eventPhase = Event.AT_TARGET;
            evt.currentTarget = node;
            Vector nodeListeners = getEventListeners(node);
            if (!evt.stopPropagation && nodeListeners != null) {
                Vector nl = (Vector) nodeListeners.clone();
                // call listeners in the order in which they got registered
                int nlsize = nl.size();
                for (int i = 0; i < nlsize; i++) {
                    LEntry le = (LEntry) nl.elementAt(i);
                    if (!le.useCapture && le.type.equals(evt.type) &&
                        nodeListeners.contains(le)) {
                        try {
                            le.listener.handleEvent(evt);
                        }
                        catch (Exception e) {
                            // All exceptions are ignored.
                        }
                    }
                }
            }
            // BUBBLING_PHASE: Ancestors are scanned, target to root, for
            // non-capturing listeners. If the event's preventBubbling flag
            // has been set before processing of a node commences, we
            // instead immediately advance to the default phase.
            // Note that not all events bubble.
            if (evt.bubbles) {
                evt.eventPhase = Event.BUBBLING_PHASE;
                int pvsize = pv.size();
                for (int j = 0; j < pvsize; j++) {
                    if (evt.stopPropagation)
                        break;  // Someone set the flag. Phase ends.

                    // Handle all bubbling listeners on this node
                    NodeImpl nn = (NodeImpl) pv.elementAt(j);
                    evt.currentTarget = nn;
                    nodeListeners = getEventListeners(nn);
                    if (nodeListeners != null) {
                        Vector nl = (Vector) nodeListeners.clone();
                        // call listeners in the order in which they got
                        // registered
                        int nlsize = nl.size();
                        for (int i = 0; i < nlsize; i++) {
                            LEntry le = (LEntry) nl.elementAt(i);
                            if (!le.useCapture && le.type.equals(evt.type) &&
                                nodeListeners.contains(le)) {
                                try {
                                    le.listener.handleEvent(evt);
                                }
                                catch (Exception e) {
                                    // All exceptions are ignored.
                                }
                            }
                        }
                    }
                }
            }
        }
        
        // DEFAULT PHASE: Some DOMs have default behaviors bound to specific
        // nodes. If this DOM does, and if the event's preventDefault flag has
        // not been set, we now return to the target node and process its
        // default handler for this event, if any.
        // No specific phase value defined, since this is DOM-internal
        if (lc.defaults > 0 && (!evt.cancelable || !evt.preventDefault)) {
            // evt.eventPhase = Event.DEFAULT_PHASE;
            // evt.currentTarget = node;
            // DO_DEFAULT_OPERATION
        }

        return evt.preventDefault;
protected voiddispatchEventToSubtree(com.sun.org.apache.xerces.internal.dom.NodeImpl node, org.w3c.dom.Node n, org.w3c.dom.events.Event e)
NON-DOM INTERNAL: DOMNodeInsertedIntoDocument and ...RemovedFrom... are dispatched to an entire subtree. This is the distribution code therefor. They DO NOT bubble, thanks be, but may be captured.

***** At the moment I'm being sloppy and using the normal capture dispatcher on every node. This could be optimized hugely by writing a capture engine that tracks our position in the tree to update the capture chain without repeated chases up to root.

param
node node to dispatch to
param
n node which was directly inserted or removed
param
e event to be sent to that node and its subtree

        Vector nodeListeners = getEventListeners(node);
        if (nodeListeners == null || n == null)
            return;

        // ***** Recursive implementation. This is excessively expensive,
        // and should be replaced in conjunction with optimization
        // mentioned above.
        ((NodeImpl) n).dispatchEvent(e);
        if (n.getNodeType() == Node.ELEMENT_NODE) {
            NamedNodeMap a = n.getAttributes();
            for (int i = a.getLength() - 1; i >= 0; --i)
                dispatchEventToSubtree(node, a.item(i), e);
        }
        dispatchEventToSubtree(node, n.getFirstChild(), e);
        dispatchEventToSubtree(node, n.getNextSibling(), e);
protected java.util.VectorgetEventListeners(com.sun.org.apache.xerces.internal.dom.NodeImpl n)
Retreive event listener registered on a given node

        if (eventListeners == null) {
            return null;
        }
        return (Vector) eventListeners.get(n);
public org.w3c.dom.DOMImplementationgetImplementation()
Retrieve information describing the abilities of this particular DOM implementation. Intended to support applications that may be using DOMs retrieved from several different sources, potentially with different underlying representations.

        // Currently implemented as a singleton, since it's hardcoded
        // information anyway.
        return DOMImplementationImpl.getDOMImplementation();
booleangetMutationEvents()
Returns true if the DOM implementation generates mutation events.

        return mutationEvents;
voidinsertedNode(com.sun.org.apache.xerces.internal.dom.NodeImpl node, com.sun.org.apache.xerces.internal.dom.NodeImpl newInternal, boolean replace)
A method to be called when a node has been inserted in the tree.

        if (mutationEvents) {
            // MUTATION POST-EVENTS:
            // "Local" events (non-aggregated)
            // New child is told it was inserted, and where
            LCount lc = LCount.lookup(MutationEventImpl.DOM_NODE_INSERTED);
            if (lc.captures + lc.bubbles + lc.defaults > 0) {
                MutationEventImpl me = new MutationEventImpl();
                me.initMutationEvent(MutationEventImpl.DOM_NODE_INSERTED,
                                     true, false, node,
                                     null, null, null, (short) 0);
                dispatchEvent(newInternal, me);
            }

            // If within the Document, tell the subtree it's been added
            // to the Doc.
            lc = LCount.lookup(
                            MutationEventImpl.DOM_NODE_INSERTED_INTO_DOCUMENT);
            if (lc.captures + lc.bubbles + lc.defaults > 0) {
                NodeImpl eventAncestor = node;
                if (savedEnclosingAttr != null)
                    eventAncestor = (NodeImpl)
                        savedEnclosingAttr.node.getOwnerElement();
                if (eventAncestor != null) { // Might have been orphan Attr
                    NodeImpl p = eventAncestor;
                    while (p != null) {
                        eventAncestor = p; // Last non-null ancestor
                        // In this context, ancestry includes
                        // walking back from Attr to Element
                        if (p.getNodeType() == ATTRIBUTE_NODE) {
                            p = (NodeImpl) ((AttrImpl)p).getOwnerElement();
                        }
                        else {
                            p = p.parentNode();
                        }
                    }
                    if (eventAncestor.getNodeType() == Node.DOCUMENT_NODE){
                        MutationEventImpl me = new MutationEventImpl();
                        me.initMutationEvent(MutationEventImpl
                                             .DOM_NODE_INSERTED_INTO_DOCUMENT,
                                             false,false,null,null,
                                             null,null,(short)0);
                        dispatchEventToSubtree(node, newInternal, me);
                    }
                }
            }
            if (!replace) {
                // Subroutine: Transmit DOMAttrModified and DOMSubtreeModified
                // (Common to most kinds of mutation)
                dispatchAggregateEvents(node, savedEnclosingAttr);
            }
        }
voidinsertedText(com.sun.org.apache.xerces.internal.dom.NodeImpl node, int offset, int count)
A method to be called when some text was inserted into a text node, so that live objects can be notified.

        // notify ranges
        if (ranges != null) {
            int size = ranges.size();
            for (int i = 0; i != size; i++) {
                ((RangeImpl)ranges.elementAt(i)).receiveInsertedText(node,
                                                                offset, count);
            }
        }
voidinsertingNode(com.sun.org.apache.xerces.internal.dom.NodeImpl node, boolean replace)
A method to be called when a node is about to be inserted in the tree.

        if (mutationEvents) {
            if (!replace) {
                saveEnclosingAttr(node);
            }
        }
voidmodifiedAttrValue(com.sun.org.apache.xerces.internal.dom.AttrImpl attr, java.lang.String oldvalue)
A method to be called when an attribute value has been modified

        if (mutationEvents) {
            // MUTATION POST-EVENTS:
            dispatchAggregateEvents(attr, attr, oldvalue,
                                    MutationEvent.MODIFICATION);
        }
voidmodifiedCharacterData(com.sun.org.apache.xerces.internal.dom.NodeImpl node, java.lang.String oldvalue, java.lang.String value)
A method to be called when a character data node has been modified

        if (mutationEvents) {
            // MUTATION POST-EVENTS:
            LCount lc =
                LCount.lookup(MutationEventImpl.DOM_CHARACTER_DATA_MODIFIED);
            if (lc.captures + lc.bubbles + lc.defaults > 0) {
                MutationEvent me = new MutationEventImpl();
                me.initMutationEvent(
                                 MutationEventImpl.DOM_CHARACTER_DATA_MODIFIED,
                                     true, false, null,
                                     oldvalue, value, null, (short) 0);
                dispatchEvent(node, me);
            }
            
            // Subroutine: Transmit DOMAttrModified and DOMSubtreeModified,
            // if required. (Common to most kinds of mutation)
            dispatchAggregateEvents(node, savedEnclosingAttr);
        } // End mutation postprocessing
voidmodifyingCharacterData(com.sun.org.apache.xerces.internal.dom.NodeImpl node)
A method to be called when a character data node has been modified

        if (mutationEvents) {
            saveEnclosingAttr(node);
        }
protected voidremoveEventListener(com.sun.org.apache.xerces.internal.dom.NodeImpl node, java.lang.String type, org.w3c.dom.events.EventListener listener, boolean useCapture)
Introduced in DOM Level 2.

Deregister an event listener previously registered with this Node. A listener must be independently removed from the Capturing and Bubbling roles. Redundant removals (of listeners not currently registered for this role) are ignored.

param
node node to remove listener from
param
type Event name (NOT event group!) to listen for.
param
listener Who gets called when event is dispatched
param
useCapture True iff listener is registered on capturing phase rather than at-target or bubbling

        // If this couldn't be a valid listener registration, ignore request
        if (type == null || type.equals("") || listener == null)
            return;
        Vector nodeListeners = getEventListeners(node);
        if (nodeListeners == null)
            return;

        // Note that addListener has previously ensured that 
        // each listener may be registered only once per type per phase.
        // count-down is OK for deletions!
        for (int i = nodeListeners.size() - 1; i >= 0; --i) {
            LEntry le = (LEntry) nodeListeners.elementAt(i);
            if (le.useCapture == useCapture && le.listener == listener && 
                le.type.equals(type)) {
                nodeListeners.removeElementAt(i);
                // Storage management: Discard empty listener lists
                if (nodeListeners.size() == 0)
                    setEventListeners(node, null);

                // Remove active listener
                LCount lc = LCount.lookup(type);
                if (useCapture)
                    --lc.captures;
                else
                    --lc.bubbles;

                break;  // Found it; no need to loop farther.
            }
        }
voidremoveNodeIterator(org.w3c.dom.traversal.NodeIterator nodeIterator)
This is not called by the developer client. The developer client uses the detach() function on the NodeIterator itself.

This function is called from the NodeIterator#detach().


        if (nodeIterator == null) return;
        if (iterators == null) return;

        iterators.removeElement(nodeIterator);
voidremoveRange(org.w3c.dom.ranges.Range range)
Not a client function. Called by Range.detach(), so a Range can remove itself from the list of Ranges.


        if (range == null) return;
        if (ranges == null) return;

        ranges.removeElement(range);
voidremovedAttrNode(com.sun.org.apache.xerces.internal.dom.AttrImpl attr, com.sun.org.apache.xerces.internal.dom.NodeImpl oldOwner, java.lang.String name)
A method to be called when an attribute node has been removed

        // We can't use the standard dispatchAggregate, since it assumes
        // that the Attr is still attached to an owner. This code is
        // similar but dispatches to the previous owner, "element".
        if (mutationEvents) {
    	    // If we have to send DOMAttrModified (determined earlier),
            // do so.
            LCount lc = LCount.lookup(MutationEventImpl.DOM_ATTR_MODIFIED);
            if (lc.captures + lc.bubbles + lc.defaults > 0) {
                MutationEventImpl me= new MutationEventImpl();
                me.initMutationEvent(MutationEventImpl.DOM_ATTR_MODIFIED,
                                     true, false, attr,
                                     attr.getNodeValue(), null, name,
                                     MutationEvent.REMOVAL);
                dispatchEvent(oldOwner, me);
            }

            // We can hand off to process DOMSubtreeModified, though.
            // Note that only the Element needs to be informed; the
            // Attr's subtree has not been changed by this operation.
            dispatchAggregateEvents(oldOwner, null, null, (short) 0);
        }
voidremovedNode(com.sun.org.apache.xerces.internal.dom.NodeImpl node, boolean replace)
A method to be called when a node has been removed from the tree.

        if (mutationEvents) {
            // MUTATION POST-EVENTS:
            // Subroutine: Transmit DOMAttrModified and DOMSubtreeModified,
            // if required. (Common to most kinds of mutation)
            if (!replace) {
                dispatchAggregateEvents(node, savedEnclosingAttr);
            }
        } // End mutation postprocessing
voidremovingNode(com.sun.org.apache.xerces.internal.dom.NodeImpl node, com.sun.org.apache.xerces.internal.dom.NodeImpl oldChild, boolean replace)
A method to be called when a node is about to be removed from the tree.


        // notify iterators
        if (iterators != null) {
            int size = iterators.size();
            for (int i = 0; i != size; i++) {
               ((NodeIteratorImpl)iterators.elementAt(i)).removeNode(oldChild);
            }
        }

        // notify ranges
        if (ranges != null) {
            int size = ranges.size();
            for (int i = 0; i != size; i++) {
                ((RangeImpl)ranges.elementAt(i)).removeNode(oldChild);
            }
        }

        // mutation events
        if (mutationEvents) {
            // MUTATION PREPROCESSING AND PRE-EVENTS:
            // If we're within the scope of an Attr and DOMAttrModified 
            // was requested, we need to preserve its previous value for
            // that event.
            if (!replace) {
                saveEnclosingAttr(node);
            }
            // Child is told that it is about to be removed
            LCount lc = LCount.lookup(MutationEventImpl.DOM_NODE_REMOVED);
            if (lc.captures + lc.bubbles + lc.defaults > 0) {
                MutationEventImpl me= new MutationEventImpl();
                me.initMutationEvent(MutationEventImpl.DOM_NODE_REMOVED,
                                     true, false, node, null,
                                     null, null, (short) 0);
                dispatchEvent(oldChild, me);
            }

            // If within Document, child's subtree is informed that it's
            // losing that status
            lc = LCount.lookup(
                             MutationEventImpl.DOM_NODE_REMOVED_FROM_DOCUMENT);
            if (lc.captures + lc.bubbles + lc.defaults > 0) {
                NodeImpl eventAncestor = this;
                if(savedEnclosingAttr != null)
                    eventAncestor = (NodeImpl)
                        savedEnclosingAttr.node.getOwnerElement();
                if (eventAncestor != null) { // Might have been orphan Attr
                    for (NodeImpl p = eventAncestor.parentNode();
                         p != null; p = p.parentNode()) {
                        eventAncestor = p; // Last non-null ancestor
                    }
                    if (eventAncestor.getNodeType() == Node.DOCUMENT_NODE){
                        MutationEventImpl me = new MutationEventImpl();
                        me.initMutationEvent(
                              MutationEventImpl.DOM_NODE_REMOVED_FROM_DOCUMENT,
                                             false, false, null,
                                             null, null, null, (short) 0);
                        dispatchEventToSubtree(node, oldChild, me);
                    }
                }
            }
        } // End mutation preprocessing
voidrenamedAttrNode(org.w3c.dom.Attr oldAt, org.w3c.dom.Attr newAt)
A method to be called when an attribute node has been renamed

	// REVISIT: To be implemented!!!
voidrenamedElement(org.w3c.dom.Element oldEl, org.w3c.dom.Element newEl)
A method to be called when an element has been renamed

	// REVISIT: To be implemented!!!
voidreplacedNode(com.sun.org.apache.xerces.internal.dom.NodeImpl node)
A method to be called when a node has been replaced in the tree.

        if (mutationEvents) {
            dispatchAggregateEvents(node, savedEnclosingAttr);
        }
voidreplacedText(com.sun.org.apache.xerces.internal.dom.NodeImpl node)
A method to be called when some text was changed in a text node, so that live objects can be notified.

        // notify ranges
        if (ranges != null) {
            int size = ranges.size();
            for (int i = 0; i != size; i++) {
                ((RangeImpl)ranges.elementAt(i)).receiveReplacedText(node);
            }
        }
voidreplacingNode(com.sun.org.apache.xerces.internal.dom.NodeImpl node)
A method to be called when a node is about to be replaced in the tree.

        if (mutationEvents) {
            saveEnclosingAttr(node);
        }
protected voidsaveEnclosingAttr(com.sun.org.apache.xerces.internal.dom.NodeImpl node)
NON-DOM INTERNAL: Pre-mutation context check, in preparation for later generating DOMAttrModified events. Determines whether this node is within an Attr

param
node node to get enclosing attribute for
return
either a description of that Attr, or null if none such.

        savedEnclosingAttr = null;
        // MUTATION PREPROCESSING AND PRE-EVENTS:
        // If we're within the scope of an Attr and DOMAttrModified 
        // was requested, we need to preserve its previous value for
        // that event.
        LCount lc = LCount.lookup(MutationEventImpl.DOM_ATTR_MODIFIED);
        if (lc.captures + lc.bubbles + lc.defaults > 0) {
            NodeImpl eventAncestor = node;
            while (true) {
                if (eventAncestor == null)
                    return;
                int type = eventAncestor.getNodeType();
                if (type == Node.ATTRIBUTE_NODE) {
                    EnclosingAttr retval = new EnclosingAttr();
                    retval.node = (AttrImpl) eventAncestor;
                    retval.oldvalue = retval.node.getNodeValue();
                    savedEnclosingAttr = retval;
                    return;
                }
                else if (type == Node.ENTITY_REFERENCE_NODE)
                    eventAncestor = eventAncestor.parentNode();
                else
                    return;
                // Any other parent means we're not in an Attr
            }
        }
voidsetAttrNode(com.sun.org.apache.xerces.internal.dom.AttrImpl attr, com.sun.org.apache.xerces.internal.dom.AttrImpl previous)
A method to be called when an attribute node has been set

        if (mutationEvents) {
            // MUTATION POST-EVENTS:
            if (previous == null) {
                dispatchAggregateEvents(attr.ownerNode, attr, null,
                                        MutationEvent.ADDITION);
            }
            else {
                dispatchAggregateEvents(attr.ownerNode, attr,
                                        previous.getNodeValue(),
                                        MutationEvent.MODIFICATION);
            }
        }
protected voidsetEventListeners(com.sun.org.apache.xerces.internal.dom.NodeImpl n, java.util.Vector listeners)
Store event listener registered on a given node This is another place where we could use weak references! Indeed, the node here won't be GC'ed as long as some listener is registered on it, since the eventsListeners table will have a reference to the node.

        if (eventListeners == null) {
            eventListeners = new Hashtable();
        }
        if (listeners == null) {
            eventListeners.remove(n);
            if (eventListeners.isEmpty()) {
                // stop firing events when there isn't any listener
                mutationEvents = false;
            }
        } else {
            eventListeners.put(n, listeners);
            // turn mutation events on
            mutationEvents = true;
        }
voidsetMutationEvents(boolean set)
Sets whether the DOM implementation generates mutation events upon operations.

        mutationEvents = set;
voidsplitData(org.w3c.dom.Node node, org.w3c.dom.Node newNode, int offset)
A method to be called when a text node has been split, so that live objects can be notified.

        // notify ranges
        if (ranges != null) {
            int size = ranges.size();
            for (int i = 0; i != size; i++) {
                ((RangeImpl)ranges.elementAt(i)).receiveSplitData(node,
                                                              newNode, offset);
            }
        }