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 .

    this.elContext = expressions.newELContext(globals,
        new GadgetELResolver(templateContext.getGadget().getContext()),
        new TemplateELResolver(templateContext),
        new ElementELResolver());


    DocumentFragment result = template.getOwnerDocument().createDocumentFragment();
    processChildNodes(result, template);
    return result;
  }

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    return processor.evaluate(tag.getAttribute(name), type, null);
  }


  protected final DocumentFragment processChildren(Element tag,
      TemplateProcessor processor) {
    DocumentFragment fragment = tag.getOwnerDocument().createDocumentFragment();
    processor.processChildNodes(fragment, tag);
    return fragment;
  }

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    this.templateDefinition = templateDefinition;
  }
  
  public void process(Node result, Element tagInstance, TemplateProcessor processor) {
    // Process the children of the tag
    DocumentFragment processedContent = processChildren(tagInstance, processor);
    
    // Save the old values of "My", "Cur", and the template root element,
    // and update each
    Map<String, Object> oldMy = processor.getTemplateContext().setMy(
        computeMy(tagInstance, processedContent, processor));

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   *
   * @return the objec as a result tree fragment.
   */
  public DocumentFragment rtree(XPathContext support)
  {
    DocumentFragment docFrag = null;
    int result = rtf();


    if (DTM.NULL == result)
    {
      DTM frag = support.createDocumentFragment();

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            break;
        case Node.DOCUMENT_NODE:
            writeDocument((Document)n, writer, repairing);
            break;
        case Node.DOCUMENT_FRAGMENT_NODE: {
            DocumentFragment frag = (DocumentFragment)n;
            Node child = frag.getFirstChild();
            while (child != null) {
                writeNode(child, writer, repairing);
                child = child.getNextSibling();
            }
            break;

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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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