e533. changing the name of a dom element.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 27 行

There is no method to change the name of an element. The only way to change the name is to create another element with the new name, copy the attributes, copy the children, and finally replace the node. 
    // Obtain a document; this method is implemented in
    // e510 The Quintessential Program to Create a DOM Document from an XML File
    Document doc = parseXmlFile("infilename.xml", false);
    
    // Obtain the root element
    Element element = doc.getDocumentElement();
    
    // Create an element with the new name
    Element element2 = doc.createElement("newname");
    
    // Copy the attributes to the new element
    NamedNodeMap attrs = element.getAttributes();
    for (int i=0; i<attrs.getLength(); i++) {
        Attr attr2 = (Attr)doc.importNode(attrs.item(i), true);
        element2.getAttributes().setNamedItem(attr2);
    }
    
    // Move all the children
    while (element.hasChildNodes()) {
        element2.appendChild(element.getFirstChild());
    }
    
    // Replace the old node with the new node
    element.getParentNode().replaceChild(element2, element);