documentimpl.java

来自「JAVA的一些源码 JAVA2 STANDARD EDITION DEVELO」· Java 代码 · 共 1,275 行 · 第 1/4 页

            if (enclosingAttr != null) {
                dispatchEvent(enclosingAttr, me);
                if (owner != null)
                    dispatchEvent(owner, me);
            }
            else
                dispatchEvent(node, me);
        }
    } // dispatchAggregateEvents(NodeImpl, AttrImpl,String) :void

    /**
     * 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. 
     */
    protected void saveEnclosingAttr(NodeImpl node) {
        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
            }
        }
    } // saveEnclosingAttr(NodeImpl) :void

    /**
     * A method to be called when a character data node has been modified
     */
    void modifyingCharacterData(NodeImpl node) {
        if (mutationEvents) {
            saveEnclosingAttr(node);
        }
    }

    /**
     * A method to be called when a character data node has been modified
     */
    void modifiedCharacterData(NodeImpl node, String oldvalue, String value) {
        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
    }

    /**
     * A method to be called when a node is about to be inserted in the tree.
     */
    void insertingNode(NodeImpl node, boolean replace) {
        if (mutationEvents) {
            if (!replace) {
                saveEnclosingAttr(node);
            }
        }
    }

    /**
     * A method to be called when a node has been inserted in the tree.
     */
    void insertedNode(NodeImpl node, NodeImpl newInternal, boolean replace) {
        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);
            }
        }
    }

    /**
     * A method to be called when a node is about to be removed from the tree.
     */
    void removingNode(NodeImpl node, NodeImpl oldChild, boolean replace) {

        // 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
    }

    /**
     * A method to be called when a node has been removed from the tree.
     */
    void removedNode(NodeImpl node, boolean replace) {
        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
    }

    /**
     * A method to be called when a node is about to be replaced in the tree.
     */
    void replacingNode(NodeImpl node) {
        if (mutationEvents) {
            saveEnclosingAttr(node);
        }
    }

    /**
     * A method to be called when a node has been replaced in the tree.
     */
    void replacedNode(NodeImpl node) {
        if (mutationEvents) {
            dispatchAggregateEvents(node, savedEnclosingAttr);
        }
    }

    /**
     * A method to be called when an attribute value has been modified
     */
    void modifiedAttrValue(AttrImpl attr, String oldvalue) {
        if (mutationEvents) {
            // MUTATION POST-EVENTS:
            dispatchAggregateEvents(attr, attr, oldvalue,
                                    MutationEvent.MODIFICATION);
        }
    }

    /**
     * A method to be called when an attribute node has been set
     */
    void setAttrNode(AttrImpl attr, AttrImpl previous) {
        if (mutationEvents) {
            // MUTATION POST-EVENTS:
            if (previous == null) {
                dispatchAggregateEvents(attr.ownerNode, attr, null,
                                        MutationEvent.ADDITION);
            }
            else {
                dispatchAggregateEvents(attr.ownerNode, attr,
                                        previous.getNodeValue(),
                                        MutationEvent.MODIFICATION);
            }
        }
    }

    /**
     * A method to be called when an attribute node has been removed
     */
    void removedAttrNode(AttrImpl attr, NodeImpl oldOwner, String name) {
        // 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);
        }
    }
    

    /**
     * A method to be called when an attribute node has been renamed
     */
    void renamedAttrNode(Attr oldAt, Attr newAt) {
	// REVISIT: To be implemented!!!
    }

    /**
     * A method to be called when an element has been renamed
     */
    void renamedElement(Element oldEl, Element newEl) {
	// REVISIT: To be implemented!!!
    }

} // class DocumentImpl