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DocumentCondenser.javaAPI DocExample4735Thu Dec 15 21:10:42 GMT 2005com.oreilly.jent.xml

DocumentCondenser

public class DocumentCondenser extends Object
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Fields Summary
Constructors Summary
Methods Summary
private static booleankeepText(org.w3c.dom.Node parentNode)

    if (parentNode == null) return true; // top level
    
    String parentName = parentNode.getLocalName();
    if ((parentName.equalsIgnoreCase("em")) ||
        (parentName.equalsIgnoreCase("title")) ||
        (parentName.equalsIgnoreCase("b")) ||
        (parentName.equalsIgnoreCase("li")) ||
        (parentName.equalsIgnoreCase("th")) ||
        ((parentName.toLowerCase().startsWith("h")) &&
         (parentName.length() == 2))) {
      return true;
    }
    
    if ((parentNode.getNodeType() == Node.ELEMENT_NODE) &&
        (parentName.equalsIgnoreCase("font"))) {
      NamedNodeMap atts = parentNode.getAttributes();
      if (atts != null) {
        Node sizeNode = atts.getNamedItem("size"); //get an attribue Node
        if (sizeNode != null) {
          if (sizeNode.getNodeValue().startsWith("+")) {
            return true;
          }
        }
      }
      
    }
    return false;
public static voidmain(java.lang.String[] args)

    
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(  );
    
    // For HTML, we don't want to validate without a DTD
    dbf.setValidating(false);
    // Ignore text elements that are completely empty:
    dbf.setIgnoringElementContentWhitespace(false);
    dbf.setExpandEntityReferences(true);
    dbf.setCoalescing(true);
    
    // Ensure that getLocalName() returns the HTML element name
    dbf.setNamespaceAware(true);
    
    DocumentBuilder db = null;
    try {
      db = dbf.newDocumentBuilder(  );
    } 
    catch (ParserConfigurationException pce) {
      pce.printStackTrace();
      return;
    }
    
    Document html = null;
    try {
      html = db.parse("enterprisexml.html");
      process(html);
      
      // Use the XSLT Transformer to see the output
      TransformerFactory tf = TransformerFactory.newInstance();
      Transformer output = tf.newTransformer();
      output.transform(new DOMSource(html), new StreamResult(System.out));
    } 
    catch (Exception ex) {
      ex.printStackTrace();
      return;
    }
private static voidprocess(org.w3c.dom.Node node)

    
    Node c = null;
    Node delNode = null;
    
    for (c = node.getFirstChild(); c != null; c = c.getNextSibling()) {
      if (delNode != null) {
        delNode.getParentNode().removeChild(delNode);
      }
      delNode = null;
      if ((c.getNodeType() == Node.TEXT_NODE) &&
          (!keepText(c.getParentNode()))) {
        delNode = c;
      } 
      else if (c.getNodeType() != Node.TEXT_NODE) {
        process(c);
      }
    } // End For
    
    if (delNode != null) // Delete, if the last child was text
      delNode.getParentNode().removeChild(delNode);