Examples of org.w3c.dom.DocumentFragment

org.w3c.dom.DocumentFragment
DocumentFragment is a "lightweight" or "minimal" Document object. It is very common to want to be able to extract a portion of a document's tree or to create a new fragment of a document. Imagine implementing a user command like cut or rearranging a document by moving fragments around. It is desirable to have an object which can hold such fragments and it is quite natural to use a Node for this purpose. While it is true that a Document object could fulfill this role, a Document object can potentially be a heavyweight object, depending on the underlying implementation. What is really needed for this is a very lightweight object. DocumentFragment is such an object.
Furthermore, various operations -- such as inserting nodes as children of another Node -- may take DocumentFragment objects as arguments; this results in all the child nodes of the DocumentFragment being moved to the child list of this node.
The children of a DocumentFragment node are zero or more nodes representing the tops of any sub-trees defining the structure of the document. DocumentFragment nodes do not need to be well-formed XML documents (although they do need to follow the rules imposed upon well-formed XML parsed entities, which can have multiple top nodes). For example, a DocumentFragment might have only one child and that child node could be a Text node. Such a structure model represents neither an HTML document nor a well-formed XML document.
When a DocumentFragment is inserted into a Document (or indeed any other Node that may take children) the children of the DocumentFragment and not the DocumentFragment itself are inserted into the Node . This makes the DocumentFragment very useful when the user wishes to create nodes that are siblings; the DocumentFragment acts as the parent of these nodes so that the user can use the standard methods from the Node interface, such as insertBefore and appendChild .

                if (parameters != null) parameters = (SourceParameters)parameters.clone();
                parameters = this.createParameters(parameters,
                                                   appHandler.getHandler().getName(),
                                                   path,
                                                   appHandler.getName());
                DocumentFragment fragment;


                Source source = null;
                try {
                    source = org.apache.cocoon.components.source.SourceUtil.getSource(loadResourceName, 
                                                                                      null, 
                                                                                      parameters, 
                                                                                      this.resolver);
                    Document doc = org.apache.cocoon.components.source.SourceUtil.toDOM(source);
                    fragment = doc.createDocumentFragment();
                    fragment.appendChild(doc.getDocumentElement());
                } catch (SourceException se) {
                    throw org.apache.cocoon.components.source.SourceUtil.handle(se);
                } catch (IOException se) {
                    throw new ProcessingException(se);
                } catch (SAXException se) {

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            // System.out.println("Text: " + text);
            SAXSVGDocumentFactory df = new SAXSVGDocumentFactory
                (XMLResourceDescriptor.getXMLParserClassName());
            String uri = ((SVGOMDocument)bridgeContext.getDocument()).
                getURLObject().toString();
            DocumentFragment result = null;
            try {
                Document d = df.createDocument(uri, new StringReader(text));
                result = doc.createDocumentFragment();
                result.appendChild(doc.importNode(d.getDocumentElement(),
                                                  true));
            } catch (Exception ex) {
                StringBuffer sb = new StringBuffer(text.length() +
                                                   FRAGMENT_PREFIX.length() +
                                                   "</svg>".length());
                sb.append(FRAGMENT_PREFIX);
                sb.append(text);
                sb.append("</svg>");
                String newText = sb.toString();
                try {
                    Document d = df.createDocument
                        (uri, new StringReader(newText));
                    for (Node n = d.getDocumentElement().getFirstChild();
                         n != null;
                         n = n.getNextSibling()) {
                        if (n.getNodeType() == n.ELEMENT_NODE) {
                            n = doc.importNode(n, true);
                            result = doc.createDocumentFragment();
                            result.appendChild(n);
                            break;
                        }
                    }
                } catch (Exception exc) {
                    SAXDocumentFactory sdf = new SAXDocumentFactory
                        (doc.getImplementation(),
                         XMLResourceDescriptor.getXMLParserClassName());
                    try {
                        Document d = sdf.createDocument
                            (uri, new StringReader(text));
                        result = doc.createDocumentFragment();
                        result.appendChild(doc.importNode(d.getDocumentElement(), true));
                    } catch (Exception ext) {
                        if (userAgent != null)
                            userAgent.displayError(ext);
                    }
                }

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  {
    if (componentNode == null)
      throw new IllegalArgumentException("No node specified");
    
    // get the fragement, imported into the target document
    DocumentFragment targetFragment = getImportedComponentFragment(componentNode);
    
    Element facetElement = ChangeUtils.__getFacetElement(componentNode, _facetName);
    
    if (facetElement != null)
    {

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  {
    if (componentNode == null)
      throw new IllegalArgumentException("No node specified");
    
    // get the fragement, imported into the target document
    DocumentFragment targetFragment = 
      getImportedComponentFragment(componentNode);
    
    // assume that we'll be appending
    Node insertBeforeNode = null;

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          gadget.getContext().getContainer(), gadget.getContext().getView());
      MessageELResolver messageELResolver = new MessageELResolver(expressions, bundle);


      int autoUpdateID = 0;
      for (Element template : templates) {
        DocumentFragment result = processor.get().processTemplate(
            template, templateContext, messageELResolver, registry);
        // TODO: sanitized renders should ignore this value
        if ("true".equals(template.getAttribute("autoUpdate"))) {
          // autoUpdate requires client-side processing.
          needsFeature = true;

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                         new NodeCreateRule(Node.DOCUMENT_FRAGMENT_NODE));
        Object result = digester.parse(new StringReader(TEST_XML));


        assertNotNull(result);
        assertTrue(result instanceof DocumentFragment);
        DocumentFragment fragment = (DocumentFragment)result;
        assertEquals(4, fragment.getChildNodes().getLength());


        Node rootBody = fragment.getFirstChild();
        assertEquals(Node.TEXT_NODE, rootBody.getNodeType());
        assertEquals("ROOT BODY", rootBody.getNodeValue());


        Node alpha = fragment.getChildNodes().item(1);
        assertEquals(Node.ELEMENT_NODE, alpha.getNodeType());
        assertEquals("alpha", alpha.getNodeName());
        assertNull(((Element)alpha).getLocalName());
        assertNull(((Element)alpha).getNamespaceURI());
        assertEquals(1, alpha.getChildNodes().getLength());
        assertEquals("ALPHA BODY", alpha.getFirstChild().getNodeValue());


        Node beta = fragment.getChildNodes().item(2);
        assertEquals(Node.ELEMENT_NODE, beta.getNodeType());
        assertEquals("beta", beta.getNodeName());
        assertNull(((Element)beta).getLocalName());
        assertNull(((Element)beta).getNamespaceURI());
        assertEquals(1, beta.getChildNodes().getLength());
        assertEquals("BETA BODY", beta.getFirstChild().getNodeValue());


        Node gamma = fragment.getChildNodes().item(3);
        assertEquals(Node.ELEMENT_NODE, gamma.getNodeType());
        assertEquals("gamma", gamma.getNodeName());
        assertNull(((Element)gamma).getLocalName());
        assertNull(((Element)gamma).getNamespaceURI());
        assertEquals(1, gamma.getChildNodes().getLength());

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        assertTrue(result instanceof List);
        List list = (List)result;
        assertEquals(2, list.size());


        assertTrue(list.get(0) instanceof DocumentFragment);
        DocumentFragment fragment = (DocumentFragment)list.get(0);


        assertEquals(Node.ELEMENT_NODE,
                     fragment.getFirstChild().getNodeType());
        Element a = (Element)fragment.getFirstChild();
        assertEquals("a", a.getNodeName());
        assertEquals(1, a.getAttributes().getLength());
        assertEquals("THREE", a.getAttribute("name"));


        assertTrue(list.get(1) instanceof String);

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                         new NodeCreateRule(Node.DOCUMENT_FRAGMENT_NODE));
        Object result = digester.parse(getInputStream("Test1.xml"));


        assertNotNull(result);
        assertTrue(result instanceof DocumentFragment);
        DocumentFragment fragment = (DocumentFragment)result;
        assertEquals(2, fragment.getChildNodes().getLength());


        assertEquals(Node.ELEMENT_NODE, fragment.getFirstChild().getNodeType());
        Element address1 = (Element)fragment.getFirstChild();
        assertEquals("address", address1.getNodeName());
        assertEquals(5, address1.getAttributes().getLength());
        assertEquals("home", address1.getAttribute("type"));
        assertEquals("Home Street", address1.getAttribute("street"));
        assertEquals("Home City", address1.getAttribute("city"));
        assertEquals("HS", address1.getAttribute("state"));
        assertEquals("HmZip", address1.getAttribute("zipCode"));


        assertEquals(Node.ELEMENT_NODE, fragment.getLastChild().getNodeType());
        Element address2 = (Element)fragment.getLastChild();
        assertEquals("address", address2.getNodeName());
        assertEquals(5, address2.getAttributes().getLength());
        assertEquals("office", address2.getAttribute("type"));
        assertEquals("Office Street", address2.getAttribute("street"));
        assertEquals("Office City", address2.getAttribute("city"));

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                         new NodeCreateRule(Node.DOCUMENT_FRAGMENT_NODE));
        Object result = digester.parse(getInputStream("Test3.xml"));


        assertNotNull(result);
        assertTrue(result instanceof DocumentFragment);
        DocumentFragment fragment = (DocumentFragment)result;
        assertEquals(2, fragment.getChildNodes().getLength());


        assertEquals(Node.ELEMENT_NODE, fragment.getFirstChild().getNodeType());
        Element address1 = (Element)fragment.getFirstChild();
        assertEquals("address", address1.getNodeName());
        assertEquals("http://jakarta.apache.org/digester/Bar",
                     address1.getNamespaceURI());
        assertEquals("address", address1.getLocalName());
        assertEquals(5, address1.getAttributes().getLength());
        assertEquals("home", address1.getAttribute("type"));
        assertEquals("Home Street", address1.getAttribute("street"));
        assertEquals("Home City", address1.getAttribute("city"));
        assertEquals("HS", address1.getAttribute("state"));
        assertEquals("HmZip", address1.getAttribute("zipCode"));


        assertEquals(Node.ELEMENT_NODE, fragment.getLastChild().getNodeType());
        Element address2 = (Element)fragment.getLastChild();
        assertEquals("address", address2.getNodeName());
        assertEquals("http://jakarta.apache.org/digester/Bar",
                     address2.getNamespaceURI());
        assertEquals("address", address2.getLocalName());
        assertEquals(5, address2.getAttributes().getLength());

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        throws SAXException, ParserConfigurationException, IOException {


        digester.addRule("root",
                         new NodeCreateRule(Node.DOCUMENT_FRAGMENT_NODE));
        Object result = digester.parse(new StringReader(TEST_XML));
        DocumentFragment fragment = (DocumentFragment)result;


        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document doc = builder.newDocument();
        Node importedFragment = doc.importNode(fragment, true);

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