Example: PropertyPrinter

• getValue() returns the XPath string value of a node

• toXML() returns a String containing the XML form of the node

import java.io.*;
import nu.xom.*;


public class PropertyPrinter {

    private Writer out;
    
    public PropertyPrinter(Writer out) {
      if (out == null) {
        throw new NullPointerException("Writer must be non-null.");
      }
      this.out = out;
    }
    
    public PropertyPrinter() {
      this(new OutputStreamWriter(System.out));
    }
    
    private int nodeCount = 0;
    
    public void writeNode(Node node) throws IOException {
      
        if (node == null) {
            throw new NullPointerException("Node must be non-null.");
        }
        if (node instanceof Document) { 
            // starting a new document, reset the node count
            nodeCount = 1; 
        }
      
        String type      = node.getClass().getName(); // never null
        String value     = node.getValue();
        
        String name      = null; 
        String localName = null;
        String uri       = null;
        String prefix    = null;

        if (node instanceof Element) {
            Element element = (Element) node;
            name = element.getQualifiedName();
            localName = element.getLocalName();
            uri = element.getNamespaceURI();
            prefix = element.getNamespacePrefix();
        }
        else if (node instanceof Attribute) {
            Element element = (Element) node;
            name = element.getQualifiedName();
            localName = element.getLocalName();
            uri = element.getNamespaceURI();
            prefix = element.getNamespacePrefix();
        }

      
        StringBuffer result = new StringBuffer();
        result.append("Node " + nodeCount + ":\r\n");
        result.append("  Type: " + type + "\r\n");
        if (name != null) {
            result.append("  Name: " + name + "\r\n");
        }
        if (localName != null) {
            result.append("  Local Name: " + localName + "\r\n");
        }
        if (prefix != null) {
            result.append("  Prefix: " + prefix + "\r\n");
        }
        if (uri != null) {
            result.append("  Namespace URI: " + uri + "\r\n");
        }
        if (value != null) {
            result.append("  Value: " + value + "\r\n");
        }
      
        out.write(result.toString());
        out.write("\r\n");
        out.flush();
      
        nodeCount++;
      
    }
    
    public static void main(String[] args) throws Exception {
     
      Builder builder = new Builder();
      for (int i = 0; i < args.length; i++) {
          PropertyPrinter p = new PropertyPrinter();
          File f = new File(args[i]);
          Document doc = builder.build(f);
          p.writeNode(doc);
      }   
        
    }

}