org.w3c.dom.Element#insertBefore ( )源码实例Demo

/**
 * Creates a new XML Schema element of the given local name
 * and insert it as the first child of the given parent node.
 *
 * @return
 *      Newly create element.
 */
private Element insertXMLSchemaElement( Element parent, String localName ) {
    // use the same prefix as the parent node to avoid modifying
    // the namespace binding.
    String qname = parent.getTagName();
    int idx = qname.indexOf(':');
    if(idx==-1)     qname = localName;
    else            qname = qname.substring(0,idx+1)+localName;

    Element child = parent.getOwnerDocument().createElementNS( Constants.NS_XSD, qname );

    NodeList children = parent.getChildNodes();

    if( children.getLength()==0 )
        parent.appendChild(child);
    else
        parent.insertBefore( child, children.item(0) );

    return child;
}
 

/**
 * Adds the specified parameters to the xsl template as variables within the alfresco namespace.
 * 
 * @param xsltModel
 *            the variables to place within the xsl template
 * @param xslTemplate
 *            the xsl template
 */
protected void addParameters(final XSLTemplateModel xsltModel, final Document xslTemplate)
{
    final Element docEl = xslTemplate.getDocumentElement();
    final String XSL_NS = docEl.getNamespaceURI();
    final String XSL_NS_PREFIX = docEl.getPrefix();

    for (Map.Entry<QName, Object> e : xsltModel.entrySet())
    {
        if (ROOT_NAMESPACE.equals(e.getKey()))
        {
            continue;
        }
        final Element el = xslTemplate.createElementNS(XSL_NS, XSL_NS_PREFIX + ":variable");
        el.setAttribute("name", e.getKey().toPrefixString());
        final Object o = e.getValue();
        if (o instanceof String || o instanceof Number || o instanceof Boolean)
        {
            el.appendChild(xslTemplate.createTextNode(o.toString()));
            // ALF-15413. Add the variables at the end of the list of children
            docEl.insertBefore(el, null);
        }
    }
}
 

private static Element maybeImplyHeadElement(Document document, TransformerContext context) {
    Element head = getHeadElement(document, context);
    if (head == null) {
        Element defaultHead = document.createElementNS(TTMLHelper.NAMESPACE_TT, "head");
        Element body = getBodyElement(document, context);
        try {
            Element root = document.getDocumentElement();
            if (body != null)
                root.insertBefore(defaultHead, body);
            else
                root.appendChild(defaultHead);
            head = defaultHead;
        } catch (DOMException e) {
            context.getReporter().logError(e);
        }
    }
    return head;
}
 

/**
 * Creates a new XML Schema element of the given local name
 * and insert it as the first child of the given parent node.
 *
 * @return
 *      Newly create element.
 */
private Element insertXMLSchemaElement( Element parent, String localName ) {
    // use the same prefix as the parent node to avoid modifying
    // the namespace binding.
    String qname = parent.getTagName();
    int idx = qname.indexOf(':');
    if(idx==-1)     qname = localName;
    else            qname = qname.substring(0,idx+1)+localName;

    Element child = parent.getOwnerDocument().createElementNS( Constants.NS_XSD, qname );

    NodeList children = parent.getChildNodes();

    if( children.getLength()==0 )
        parent.appendChild(child);
    else
        parent.insertBefore( child, children.item(0) );

    return child;
}
 

/**
 * Creates a new XML Schema element of the given local name
 * and insert it as the first child of the given parent node.
 *
 * @return
 *      Newly create element.
 */
private Element insertXMLSchemaElement( Element parent, String localName ) {
    // use the same prefix as the parent node to avoid modifying
    // the namespace binding.
    String qname = parent.getTagName();
    int idx = qname.indexOf(':');
    if(idx==-1)     qname = localName;
    else            qname = qname.substring(0,idx+1)+localName;

    Element child = parent.getOwnerDocument().createElementNS( Constants.NS_XSD, qname );

    NodeList children = parent.getChildNodes();

    if( children.getLength()==0 )
        parent.appendChild(child);
    else
        parent.insertBefore( child, children.item(0) );

    return child;
}
 

/**
 * Creates a new XML Schema element of the given local name
 * and insert it as the first child of the given parent node.
 *
 * @return
 *      Newly create element.
 */
private Element insertXMLSchemaElement( Element parent, String localName ) {
    // use the same prefix as the parent node to avoid modifying
    // the namespace binding.
    String qname = parent.getTagName();
    int idx = qname.indexOf(':');
    if(idx==-1)     qname = localName;
    else            qname = qname.substring(0,idx+1)+localName;

    Element child = parent.getOwnerDocument().createElementNS( Constants.NS_XSD, qname );

    NodeList children = parent.getChildNodes();

    if( children.getLength()==0 )
        parent.appendChild(child);
    else
        parent.insertBefore( child, children.item(0) );

    return child;
}
 

private void unsetExcludeEnlistedClasses() throws IOException {
    Element puElement = helper.findElement(PERSISTENCE_UNIT_TAG);
    NodeList nodes = puElement.getElementsByTagName(EXCLUDE_UNLISTED_CLASSES_TAG);

    if (nodes.getLength() > 0) {
        helper.setValue((Element) nodes.item(0), "false");  //NOI18N
    } else {
        puElement.insertBefore(helper.createElement(EXCLUDE_UNLISTED_CLASSES_TAG, "false"),  //NOI18N
                helper.findElement(PROPERTIES_TAG));
    }
}
 

private void addEntityClasses(Collection<String> classNames) throws IOException {
    List<String> toAdd = new ArrayList<String>(classNames);   
    Element puElement = helper.findElement(PERSISTENCE_UNIT_TAG);
    NodeList nodes = puElement.getElementsByTagName(CLASS_TAG);
    int length = nodes.getLength();
    
    for (int i = 0; i < length; i++) {
        toAdd.remove(helper.getValue((Element) nodes.item(i)));
    }
    
    for (String className : toAdd) {   
        puElement.insertBefore(helper.createElement(CLASS_TAG, className),
                helper.findElement(EXCLUDE_UNLISTED_CLASSES_TAG));
    }
}
 

@Override
public void setDocumentVersion(ImmoXmlVersion version) {
    try {
        Document doc = this.getDocument();

        String currentVersion = StringUtils.trimToEmpty(XmlUtils
                .newXPath("/io:immoxml/io:uebertragung/@version", doc)
                .stringValueOf(doc));
        String[] ver = StringUtils.split(currentVersion, "/", 2);

        Element node = (Element) XmlUtils
                .newXPath("/io:immoxml/io:uebertragung", doc)
                .selectSingleNode(doc);
        if (node == null) {
            Element parentNode = (Element) XmlUtils
                    .newXPath("/io:immoxml", doc)
                    .selectSingleNode(doc);
            if (parentNode == null) {
                LOGGER.warn("Can't find an <immoxml> element in the document!");
                return;
            }
            node = doc.createElement("uebertragung");
            parentNode.insertBefore(node, parentNode.getFirstChild());
        }

        String newVersion = version.toReadableVersion();
        if (ver.length > 1) newVersion += "/" + ver[1];
        node.setAttribute("version", newVersion);
    } catch (JaxenException ex) {
        LOGGER.error("Can't evaluate XPath expression!");
        LOGGER.error("> " + ex.getLocalizedMessage(), ex);
    }
}
 

public Object getResult(Object existing) {
    Document dom = (Document)result.getNode();
    Element e = dom.getDocumentElement();
    if(existing instanceof Element) {
        // merge all the children
        Element prev = (Element) existing;
        Node anchor = e.getFirstChild();
        while(prev.getFirstChild()!=null) {
            Node move = prev.getFirstChild();
            e.insertBefore(e.getOwnerDocument().adoptNode(move), anchor );
        }
    }
    return e;
}
 

/**
 *  Creates a new element with given text: <element>text</element>
 * @param element  Name of new element tag
 * @param text     Text that element tag should contain
 * @return new element node. (not actually added to document yet)
 */
public Element createElement(String element, String text) {
  Element node = document.createElement( element);
  if (text != null) {
    Node textNode = document.createTextNode( text);
    node.insertBefore( textNode, null);
  }
  return node;
}
 

public Object getResult(Object existing) {
    Document dom = (Document)result.getNode();
    Element e = dom.getDocumentElement();
    if(existing instanceof Element) {
        // merge all the children
        Element prev = (Element) existing;
        Node anchor = e.getFirstChild();
        while(prev.getFirstChild()!=null) {
            Node move = prev.getFirstChild();
            e.insertBefore(e.getOwnerDocument().adoptNode(move), anchor );
        }
    }
    return e;
}
 

@Override
protected Element getSemanticElement(Document doc, SymbolContext context) {
    // T.L. abstract method used to add data from subclasses
    Element e = getLevelElement(doc, context); //SymbolElement.getLevelElement is not supposed to be called
    try {
      Element l = appendText(doc,"level",Integer.toString(getLevel()));
      e.insertBefore(l,e.getFirstChild());
    } catch (RuntimeException ee) {
      // not sure it is legal for a LevelNode not to have level, debug it!
    }
    return e;
  }
 

/**
 * 
 * <p>
 * insertElementCorrectly
 * </p>
 * 
 * @param root
 *            element representing the &lt; web-app &gt;
 * @param toInsert
 *            element to insert into the web.xml hierarchy.
 * @param elementsBefore
 *            an array of web.xml elements that should be defined before the
 *            element we want to insert. This order should be the order
 *            defined by the web.xml's DTD or XSD type definition.
 */
protected static void insertElementCorrectly( Element root, Element toInsert, String[] elementsBefore )
{
    NodeList allChildren = root.getChildNodes();
    List<String> elementsBeforeList = Arrays.asList(elementsBefore);
    Node insertBefore = null;
    for (int i = 0; i < allChildren.getLength(); i++)
    {
        Node node = allChildren.item(i);
        if (insertBefore == null)
        {
            insertBefore = node;
        }
        if (node.getNodeType() == Node.ELEMENT_NODE)
        {
            if (elementsBeforeList.contains(node.getNodeName()))
            {
                insertBefore = null;
            }
            else
            {
                break;
            }
        }
    }
    if (insertBefore == null)
    {
        root.appendChild(toInsert);
    }
    else
    {
        root.insertBefore(toInsert, insertBefore);
    }
}
 

/**
 * Append a child element to the parent at the specified location.
 *
 * Starting with a valid document, append an element according to the schema
 * sequence represented by the <code>order</code>.  All existing child elements must be
 * include as well as the new element.  The existing child element following
 * the new child is important, as the element will be 'inserted before', not
 * 'inserted after'.
 *
 * @param parent parent to which the child will be appended
 * @param el element to be added
 * @param order order of the elements which must be followed
 * @throws IllegalArgumentException if the order cannot be followed, either
 * a missing existing or new child element is not specified in order
 *
 * @since 8.4
 */
public static void appendChildElement(Element parent, Element el, String[] order) throws IllegalArgumentException {
    List<String> l = Arrays.asList(order);
    int index = l.indexOf(el.getLocalName());

    // ensure the new new element is contained in the 'order'
    if (index == -1) {
        throw new IllegalArgumentException("new child element '"+ el.getLocalName() + "' not specified in order " + l); // NOI18N
    }

    List<Element> elements = findSubElements(parent);
    Element insertBefore = null;

    for (Element e : elements) {
        int index2 = l.indexOf(e.getLocalName());
        // ensure that all existing elements are in 'order'
        if (index2 == -1) {
            throw new IllegalArgumentException("Existing child element '" + e.getLocalName() + "' not specified in order " + l);  // NOI18N
        }
        if (index2 > index) {
            insertBefore = e;
            break;
        }
    }

    parent.insertBefore(el, insertBefore);
}
 

public static void addReturnBeforeChild(Element e, Node child) {
    if (!ignoreLineBreaks) {
        Document doc = e.getOwnerDocument();
        e.insertBefore(doc.createTextNode("\n"), child);
    }
}
 

public static Element getOrCreateCallback(Element parent, String name, FacesRegistry registry) {

        Element cb = getCallback(parent, name);
        
        if (cb == null) {
            cb = XPagesDOMUtil.createElement(parent.getOwnerDocument(), registry, XPagesDOMUtil.getNamespaceUri(), XSP_TAG_CALLBACK);
            
            if (null != name) {
                cb.setAttribute(XSP_ATTR_FACETNAME, name);
            }
            
            parent.insertBefore(cb, parent.getFirstChild());
        }
        
        return cb;
    }
 

public static void addReturnBeforeChild(Element e, Node child) {
    if (!ignoreLineBreaks) {
        Document doc = e.getOwnerDocument();
        e.insertBefore(doc.createTextNode("\n"), child);
    }
}
 

private static boolean updateRawReferenceElement(RawReference ref, Element references) throws IllegalArgumentException {
    // Linear search; always keeping references sorted first by foreign project
    // name, then by target name.
    Element nextRefEl = null;
    Iterator<Element> it = XMLUtil.findSubElements(references).iterator();
    while (it.hasNext()) {
        Element testRefEl = it.next();
        RawReference testRef = RawReference.create(testRefEl);
        if (testRef.getForeignProjectName().compareTo(ref.getForeignProjectName()) > 0) {
            // gone too far, go back
            nextRefEl = testRefEl;
            break;
        }
        if (testRef.getForeignProjectName().equals(ref.getForeignProjectName())) {
            if (testRef.getID().compareTo(ref.getID()) > 0) {
                // again, gone too far, go back
                nextRefEl = testRefEl;
                break;
            }
            if (testRef.getID().equals(ref.getID())) {
                // Key match, check if it needs to be updated.
                if (testRef.getArtifactType().equals(ref.getArtifactType()) &&
                        testRef.getScriptLocationValue().equals(ref.getScriptLocationValue()) &&
                        testRef.getProperties().equals(ref.getProperties()) &&
                        testRef.getTargetName().equals(ref.getTargetName()) &&
                        testRef.getCleanTargetName().equals(ref.getCleanTargetName())) {
                    // Match on other fields. Return without changing anything.
                    return false;
                }
                // Something needs updating.
                // Delete the old ref and set nextRef to the next item in line.
                references.removeChild(testRefEl);
                if (it.hasNext()) {
                    nextRefEl = it.next();
                } else {
                    nextRefEl = null;
                }
                break;
            }
        }
    }
    // Need to insert a new record before nextRef.
    Element newRefEl = ref.toXml(references.getNamespaceURI(), references.getOwnerDocument());
    // Note: OK if nextRefEl == null, that means insert as last child.
    references.insertBefore(newRefEl, nextRefEl);
    return true;
}
 

/**
 * Adds the element util:message-box in the right place in default.jspx
 * layout
 */
private void addMessageBoxInLayout() {
    PathResolver pathResolver = projectOperations.getPathResolver();
    String defaultJspx = pathResolver.getIdentifier(
            LogicalPath.getInstance(Path.SRC_MAIN_WEBAPP, ""),
            "WEB-INF/layouts/default.jspx");

    if (!fileManager.exists(defaultJspx)) {
        // layouts/default.jspx doesn't exist, so nothing to do
        return;
    }

    InputStream defulatJspxIs = fileManager.getInputStream(defaultJspx);

    Document defaultJspxXml;
    try {
        defaultJspxXml = XmlUtils.getDocumentBuilder().parse(defulatJspxIs);
    }
    catch (Exception ex) {
        throw new IllegalStateException("Could not open default.jspx file",
                ex);
    }

    Element lsHtml = defaultJspxXml.getDocumentElement();

    // Set dialog tag lib as attribute in html element
    lsHtml.setAttribute("xmlns:dialog",
            "urn:jsptagdir:/WEB-INF/tags/dialog/modal");

    Element messageBoxElement = DomUtils.findFirstElementByName(
            "dialog:message-box", lsHtml);
    if (messageBoxElement == null) {
        Element divMain = XmlUtils.findFirstElement(
                "/html/body/div/div[@id='main']", lsHtml);
        Element insertAttributeBodyElement = XmlUtils.findFirstElement(
                "/html/body/div/div/insertAttribute[@name='body']", lsHtml);
        Element messageBox = new XmlElementBuilder("dialog:message-box",
                defaultJspxXml).build();
        divMain.insertBefore(messageBox, insertAttributeBodyElement);
    }

    writeToDiskIfNecessary(defaultJspx, defaultJspxXml.getDocumentElement());

}