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 .

                        ComponentManager   manager)
    throws SAXException, ProcessingException, IOException {
        if (this.saveResource == null) {
            throw new ProcessingException("The context " + this.name + " does not support saving.");
        }
        DocumentFragment frag = this.getXML(path);
        if (frag == null) {
            // create empty fake document
            frag = DOMUtil.createDocument().createDocumentFragment();
        }

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            // for each node in the node set,
            // then close the repeat tag
            if ((TAG_REPEAT.equals(name)) &&
                (repeatTagDepth==currentTagDepth)) {
                isRecording = false;
                DocumentFragment docFragment = endRecording();


                unrollRepeatTag(docFragment);
                nodeset = null;
                // close the repeat tag
                super.endElement(uri, name, raw);
            }
            // similarly for an itemset tag
            else if ((TAG_ITEMSET.equals(name)) &&
                     (repeatTagDepth==currentTagDepth)) {
                isRecording = false;
                DocumentFragment docFragment = endRecording();


                unrollItemSetTag(docFragment);
                nodeset = null;
            }
            // if within a repeat tag, keep recording

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    throws ProcessingException {
        if (path == null || path.charAt(0) != '/') {
            throw new ProcessingException("Not a valid XPath: " + path);
        }
        path = this.createPath(path);
        DocumentFragment result = null;
        NodeList list;


        try {
            list = DOMUtil.selectNodeList(this.contextData, path);
        } catch (javax.xml.transform.TransformerException localException) {
            throw new ProcessingException("Exception: " + localException, localException);
        }
        if (list != null && list.getLength() > 0) {
            result = DOMUtil.getOwnerDocument(contextData).createDocumentFragment();
            for(int i = 0; i < list.getLength(); i++) {


                // the found node is either an attribute or an element
                if (list.item(i).getNodeType() == Node.ATTRIBUTE_NODE) {
                    // if it is an attribute simple create a new text node with the value of the attribute
                    result.appendChild(DOMUtil.getOwnerDocument(contextData).createTextNode(list.item(i).getNodeValue()));
                } else {
                    // now we have an element
                    // copy all children of this element in the resulting tree
                    NodeList childs = list.item(i).getChildNodes();
                    if (childs != null) {
                        for(int m = 0; m < childs.getLength(); m++) {
                            result.appendChild(DOMUtil.getOwnerDocument(contextData).importNode(childs.item(m), true));
                        }
                    }
                }
            }
        }

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        }
        if (context == null) {
            throw new ProcessingException("SessionManager.getContextFragment: Context '" + contextName + "' not found.");
        }


        DocumentFragment frag;
        frag = context.getXML(path);


        if (this.getLogger().isDebugEnabled() == true) {
            this.getLogger().debug("END getContextFragment documentFragment=" + (frag == null ? "null" : XMLUtils.serializeNodeToXML(frag)));
        }

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        }
        if (formName == null) {
            throw new ProcessingException("SessionManager.registerInputField: Form is required");
        }


        DocumentFragment value = null;
        SessionContext context = this.getContext(contextName);
        if (context == null) {
            throw new ProcessingException("SessionManager.registerInputField: Context not found " + contextName);
        }
        Session session = this.getSession(false);

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        if (path == null) {
            throw new ProcessingException("getXML: Path is required");
        }
        if (path.startsWith("/") == false) path = '/' + path;


        DocumentFragment frag = null;


        if ( path.equals("/") ) {
            // get all: first authentication then application
            frag = this.authContext.getXML("/authentication");


            if (frag != null) {
                // now add root node authentication
                Node root = frag.getOwnerDocument().createElementNS(null, "authentication");
                Node child;
                while (frag.hasChildNodes() == true) {
                    child = frag.getFirstChild();
                    frag.removeChild(child);
                    root.appendChild(child);
                }
                frag.appendChild(root);
            }


            if (this.applicationName != null) {
                // join
                DocumentFragment appFrag = this.authContext.getXML("/applications/" + this.applicationName);
                if (appFrag != null) {
                    // now add root node application
                    Node root = appFrag.getOwnerDocument().createElementNS(null, "application");
                    Node child;
                    while (appFrag.hasChildNodes() ) {
                        child = appFrag.getFirstChild();
                        appFrag.removeChild(child);
                        root.appendChild(child);
                    }
                    appFrag.appendChild(root);


                    if (frag == null) {
                        frag = appFrag;
                    } else {
                        while (appFrag.hasChildNodes() ) {
                            child = appFrag.getFirstChild();
                            appFrag.removeChild(child);
                            child = frag.getOwnerDocument().importNode(child, true);
                            frag.appendChild(child);
                        }
                    }
                }

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            // now create the following xml:
            // <failed/>
            // if data is available data is included, otherwise:
            // <data>No information</data>
            // If exception message contains info, it is included into failed
            DocumentFragment authenticationFragment = doc.createDocumentFragment();


            Element element = doc.createElementNS(null, "failed");
            authenticationFragment.appendChild(element);


            if (exceptionMsg != null) {
                Text text = doc.createTextNode(exceptionMsg);
                element.appendChild(text);
            }


            if (data == null) {
                element = doc.createElementNS(null, "data");
                authenticationFragment.appendChild(element);
                Text text = doc.createTextNode("No information");
                element.appendChild(text);
            } else {
                authenticationFragment.appendChild(doc.importNode(data, true));
            }
            
            // now set this information in the temporary context
            SessionManager sessionManager = null;
            try {

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        if (authSaveResource == null) {
            throw new ProcessingException("The context " + this.name + " does not support saving.");
        }


        synchronized(this.authContext) {
            DocumentFragment fragment = this.getXML(path);
            if (fragment == null) {
                // create empty fake fragment
                fragment = DOMUtil.createDocument().createDocumentFragment();
            }
            if (parameters != null) {

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                parameters = (SourceParameters)authLoadResourceParameters.clone();
            }
            parameters = this.createParameters(parameters,
                                               path,
                                               false); 
            DocumentFragment frag;
            
            frag = SourceUtil.readDOM(authLoadResource, 
                                      null, 
                                      parameters, 
                                      resolver);

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                parameters = (SourceParameters)loadResourceParameters.clone();
            }
            parameters = this.createParameters(parameters,
                                               path,
                                               true);
            DocumentFragment fragment;
            fragment = SourceUtil.readDOM(loadResource, 
                                          null, 
                                          parameters, 
                                          resolver);
            this.setXML(path, fragment);

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