Examples of org.apache.xerces.dom.NodeImpl

org.apache.xerces.dom.NodeImpl
NodeImpl provides the basic structure of a DOM tree. It is never used directly, but instead is subclassed to add type and data information, and additional methods, appropriate to each node of the tree. Only its subclasses should be instantiated -- and those, with the exception of Document itself, only through a specific Document's factory methods.
The Node interface provides shared behaviors such as siblings and children, both for consistancy and so that the most common tree operations may be performed without constantly having to downcast to specific node types. When there is no obvious mapping for one of these queries, it will respond with null. Note that the default behavior is that children are forbidden. To permit them, the subclass ParentNode overrides several methods.
NodeImpl also implements NodeList, so it can return itself in response to the getChildNodes() query. This eliminiates the need for a separate ChildNodeList object. Note that this is an IMPLEMENTATION DETAIL; applications should _never_ assume that this identity exists.
All nodes in a single document must originate in that document. (Note that this is much tighter than "must be same implementation") Nodes are all aware of their ownerDocument, and attempts to mismatch will throw WRONG_DOCUMENT_ERR.
However, to save memory not all nodes always have a direct reference to their ownerDocument. When a node is owned by another node it relies on its owner to store its ownerDocument. Parent nodes always store it though, so there is never more than one level of indirection. And when a node doesn't have an owner, ownerNode refers to its ownerDocument.
This class doesn't directly support mutation events, however, it still implements the EventTarget interface and forward all related calls to the document so that the document class do so. @author Arnaud Le Hors, IBM @author Joe Kesselman, IBM @version $Id: NodeImpl.java,v 1.58 2002/10/01 19:59:39 lmartin Exp $ @since PR-DOM-Level-1-19980818.

            super.startElement(qName, xmlAttributes, augmentations);
            setLocation();
        }


        private final void setLocation() {
            NodeImpl node = null;
            try {
                node = (NodeImpl) this.getProperty("http://apache.org/xml/properties/dom/current-element-node");
            } catch (org.xml.sax.SAXException ex) {
                System.err.println("except" + ex);
            }
            if (node != null) {
                String location = locator.getLiteralSystemId() + ":" + locator.getLineNumber() + ":" + locator.getColumnNumber();
                node.setUserData("location", location, null);
            }
        }

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        }
        if (fCreateEntityRefNodes) {
            if (!fDeferNodeExpansion) {
                if (fDocumentType != null) {
                    NamedNodeMap entities = fDocumentType.getEntities();
                    NodeImpl entity = (NodeImpl)entities.getNamedItem(name);
                    if (entity != null && entity.getFirstChild() == null) {
                        entity.setReadOnly(false, true);
                        Node child = fCurrentNode.getFirstChild();
                        while (child != null) {
                            Node copy = child.cloneNode(true);
                            entity.appendChild(copy);
                            child = child.getNextSibling();
                        }
                        entity.setReadOnly(true, true);
                        entities.setNamedItem(entity);
                    }
                }
                // Make entity ref node read only
                ((NodeImpl)fCurrentNode).setReadOnly(true, true);

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        Assertion.verify(((NodeImpl) dt).getTextContent() == null);
        // no-ops:
        ((NodeImpl) doc).setTextContent("foo");
        ((NodeImpl) dt).setTextContent("foo");


        NodeImpl el = (NodeImpl) doc.getDocumentElement();
        Assertion.equals(((NodeImpl) el).getTextContent(), "");
        el.setTextContent("yo!");
        Node t = el.getFirstChild();
        Assertion.verify(t != null && t.getNodeType() == Node.TEXT_NODE &&
                         t.getNodeValue().equals("yo!"));
        Assertion.equals(el.getTextContent(), "yo!");


        Comment c = doc.createComment("dummy");
        el.appendChild(c);
        
        NodeImpl el2 = (NodeImpl) doc.createElement("bar");
        el2.setTextContent("bye now");
        el.appendChild(el2);
        Assertion.equals(el.getTextContent(), "yo!bye now");
        
        // check that empty element does not produce null value
    NodeImpl el3 = (NodeImpl) doc.createElement("test");
    el.appendChild(el3);
    NodeImpl empty = (NodeImpl) doc.createElement("empty");
    el3.appendChild(empty);
    Assertion.verify(el3.getTextContent() != null);
    
    empty.setTextContent("hello");
    Assertion.verify(empty.getChildNodes().getLength() == 1);
    // check that setting to empty string or null, does not produce
    // any text node
    empty.setTextContent(null);
    Assertion.verify(empty.getChildNodes().getLength() == 0);
    empty.setTextContent("");
    Assertion.verify(empty.getChildNodes().getLength() == 0);
    
    




        class MyHandler implements UserDataHandler {
            boolean fCalled;
            Node fNode;
            String fKey;
            Object fData;


            MyHandler(String key, Object data, Node node) {
                fCalled = false;
                fKey = key;
                fData = data;
                fNode = node;
            }
            public void handle(short operation, String key,
                               Object data, Node src, Node dst) {
                Assertion.verify(operation == UserDataHandler.NODE_CLONED);
                Assertion.verify(key == fKey && data == fData && src == fNode);
                Assertion.verify(dst != null &&
                                 dst.getNodeType() == fNode.getNodeType());
                fCalled = true;
            }
        }


        el.setUserData("mykey", c, null);
        el.setUserData("mykey2", el2, null);
        Assertion.verify(el.getUserData("mykey") == c);
        Assertion.verify(el.getUserData("mykey2") == el2);
        el.setUserData("mykey", null, null);
        Assertion.verify(el.getUserData("mykey") == null);
        el.setUserData("mykey2", null, null);
        Assertion.verify(el.getUserData("mykey2") == null);
 
        MyHandler h = new MyHandler("mykey", c, el);
        el.setUserData("mykey", c, h);
        MyHandler h2 = new MyHandler("mykey2", el2, el);
        el.setUserData("mykey2", el2, h2);
        Node cl = el.cloneNode(false);
        Assertion.verify(h.fCalled == true);
        Assertion.verify(h2.fCalled == true);




        el.setTextContent("zapped!");
        Node t2 = el.getFirstChild();
        Assertion.verify(t2.getNodeValue().equals("zapped!"));
        Assertion.verify(t2.getNextSibling() == null);
    }




    //
    // isEqualNode
    // Note: we rely on setTextContent to work properly, in case of errors
    // make sure it is the case first.


    {
        DOMImplementation impl = DOMImplementationImpl.getDOMImplementation();


        Document doc = impl.createDocument(null, "root", null);
        NodeImpl root = (NodeImpl) doc.getDocumentElement();


        NodeImpl n1 = (NodeImpl) doc.createElement("el");
        n1.setTextContent("yo!");


        NodeImpl n2 = (NodeImpl) doc.createElement("el");
        n2.setTextContent("yo!");


        Assertion.verify(n1.isEqualNode(n2) == true);


        n2.setTextContent("yoyo!");
        Assertion.verify(n1.isEqualNode(n2) == false);


        n1.setTextContent("yoyo!");
        ((Element) n1).setAttribute("a1", "v1");
        ((Element) n1).setAttributeNS("uri", "a2", "v2");
        ((Element) n2).setAttribute("a1", "v1");
        ((Element) n2).setAttributeNS("uri", "a2", "v2");
        Assertion.verify(n1.isEqualNode(n2) == true);
        
        Element elem = doc.createElementNS(null, "e2");
        root.appendChild(elem);
        Attr attr = doc.createAttributeNS("http://attr", "attr1");
        elem.setAttributeNode(attr);
        
        // check that setAttribute sets both name and value
        elem.setAttributeNS("http://attr","p:attr1","v2");
        Attr attr2 = elem.getAttributeNodeNS("http://attr", "attr1");
        Assertion.verify(attr2.getNodeName().equals("p:attr1"), "p:attr1");
        Assertion.verify(attr2.getNodeValue().equals("v2"), "value v2");
        
        // check that prefix is not null
        elem.setAttributeNS("http://attr","attr1","v2");
        attr2 = elem.getAttributeNodeNS("http://attr", "attr1");
        Assertion.verify(attr2.getNodeName().equals("attr1"), "attr1");
        


        ((Element) n2).setAttribute("a1", "v2");
        Assertion.verify(n1.isEqualNode(n2) == false);


        root.appendChild(n1);
        root.appendChild(n2);


        NodeImpl clone = (NodeImpl) root.cloneNode(true);
        Assertion.verify(clone.isEqualNode(root) == true);


    }


    System.out.println("done.");
    };

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            {


                Document doc = builder.parseURI("tests/dom/dom3/input.xml");
                NodeList ls = doc.getElementsByTagName("a:elem_a"); 


                NodeImpl elem = (NodeImpl)ls.item(0);
                if (namespaces) {
                    //System.out.println("[a:elem_a].lookupPrefix('http://www.example.com', true) == null");
                    Assertion.verify(elem.lookupPrefix("http://www.example.com").equals("ns1"), 
                                     "[a:elem_a].lookupPrefix(http://www.example.com)==null");




                    //System.out.println("[a:elem_a].isDefaultNamespace('http://www.example.com') == true");
                    Assertion.verify(elem.isDefaultNamespace("http://www.example.com") == true, 
                                     "[a:elem_a].isDefaultNamespace(http://www.example.com)==true");




                    //System.out.println("[a:elem_a].lookupPrefix('http://www.example.com', false) == ns1");
                    Assertion.verify(elem.lookupPrefix("http://www.example.com").equals("ns1"), 
                                     "[a:elem_a].lookupPrefix(http://www.example.com)==ns1");




                    Assertion.verify(elem.lookupNamespaceURI("xsi").equals("http://www.w3.org/2001/XMLSchema-instance"), 
                                     "[a:elem_a].lookupNamespaceURI('xsi') == 'http://www.w3.org/2001/XMLSchema-instance'" );


                } else {
                    Assertion.verify( elem.lookupPrefix("http://www.example.com") == null,"lookupPrefix(http://www.example.com)==null"); 
                }


                ls = doc.getElementsByTagName("bar:leaf");
                elem = (NodeImpl)ls.item(0);
                Assertion.verify(elem.lookupPrefix("url1:").equals("foo"), 
                                 "[bar:leaf].lookupPrefix('url1:', false) == foo");
                //System.out.println("[bar:leaf].lookupPrefix('url1:', false) == "+ );


                //System.out.println("==>Create b:baz with namespace 'b:' and xmlns:x='b:'");
                ls = doc.getElementsByTagName("baz");
                elem = (NodeImpl)ls.item(0);
                ls = doc.getElementsByTagName("elem8");
                elem = (NodeImpl)ls.item(0);
                Element e1 = doc.createElementNS("b:","p:baz");
                e1.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:x", "b:");
                elem.appendChild(e1);




                Assertion.verify(((NodeImpl)e1).lookupPrefix("b:").equals("p"), 
                                 "[p:baz].lookupPrefix('b:', false) == p");






                //System.out.println("[p:baz].lookupPrefix('b:', false) == "+ ((NodeImpl)e1).lookupPrefix("b:",false));


                Assertion.verify(elem.lookupNamespaceURI("xsi").equals("http://www.w3.org/2001/XMLSchema-instance"), 
                                 "[bar:leaf].lookupNamespaceURI('xsi') == 'http://www.w3.org/2001/XMLSchema-instance'" );


            
            }

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        int length      = nl.getLength();


        if ( length == 0 )
            System.out.println(argv[1] + ": is not in the document!");


        NodeImpl node = null;
        for ( int i = 0;i<length;i++ ){
            node                = (NodeImpl) nl.item(i);
            Node childOfElement = node.getFirstChild();
            if ( childOfElement != null ){
                System.out.println( node.getNodeName() + ": " +
                                    childOfElement.getNodeValue() );
            }
        }
        try {
           Writer prettyWriter = new Writer( false );

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                throw new RuntimeException(
                        "Error: locator is null. Check that you have the" +
                        " correct version of Xerces (such as the one that" +
                        " comes with Cocoon) in your endorsed library path.");
            }
            NodeImpl node = null;
            try {
                node = (NodeImpl)this.getProperty(
                        "http://apache.org/xml/properties/dom/current-element-node");
            } catch (org.xml.sax.SAXException ex) {
                System.err.println("except" + ex);
            }
            if (node != null) {
                Integer[] location = new Integer[] {locator.getLineNumber(), locator.getColumnNumber()};
                node.setUserData("location", location, (UserDataHandler)null);
            }
        }

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            super.startElement(qName, xmlAttributes, augmentations);
            setLocation();
        }


        private final void setLocation() {
            NodeImpl node = null;
            try {
                node = (NodeImpl) this.getProperty("http://apache.org/xml/properties/dom/current-element-node");
            } catch (org.xml.sax.SAXException ex) {
                System.err.println("except" + ex);
            }
            if (node != null) {
                String location = locator.getLiteralSystemId() + ": line " + locator.getLineNumber();
                node.setUserData("location", location, null);
            }
        }

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        }
        if (fCreateEntityRefNodes) {
            if (!fDeferNodeExpansion) {
                if (fDocumentType != null) {
                    NamedNodeMap entities = fDocumentType.getEntities();
                    NodeImpl entity = (NodeImpl)entities.getNamedItem(name);
                    if (entity != null && entity.getFirstChild() == null) {
                        entity.setReadOnly(false, true);
                        Node child = fCurrentNode.getFirstChild();
                        while (child != null) {
                            Node copy = child.cloneNode(true);
                            entity.appendChild(copy);
                            child = child.getNextSibling();
                        }
                        entity.setReadOnly(true, true);
                        entities.setNamedItem(entity);
                    }
                }
                // Make entity ref node read only
                ((NodeImpl)fCurrentNode).setReadOnly(true, true);

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    public Node cloneNode( boolean deep )
    {
        HTMLDocumentImpl    clone;
        NodeImpl            node;


        clone = new HTMLDocumentImpl();
        if ( deep ) {
            node = (NodeImpl) getFirstChild();
            while ( node != null ) {
                clone.appendChild( clone.importNode( node, true ) );
                node = (NodeImpl) node.getNextSibling();
            }
        }
        return clone;
    }

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