Remove XML Node using java parser

Question

In the below sample XML, how to remove Entire B Node if E=13 using java parser.

   
     
       
         11         


        

Answer 1

It's easy if you are using DOM. Just traverse the document and keep track of the B nodes. When you hit an E=13 node, remove the B node. Here is some code to help:

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
Document doc = factory.newDocumentBuilder().parse(new File("file.xml"));
DocumentTraversal traversal = (DocumentTraversal) doc;
Node a = doc.getDocumentElement();
NodeIterator iterator = traversal.createNodeIterator(a, NodeFilter.SHOW_ELEMENT, null, true);
Element b = null;
for (Node n = iterator.nextNode(); n != null; n = iterator.nextNode()) {
    Element e = (Element) n;
    if ("B".equals(e.getTagName())) {
        b = e;
    } else if ("E".equals(e.getTagName()) && "13".equals(e.getTextContent()) && b != null) {
        a.removeChild(b);
    }
}