Create a StAX Event Tree Viewer : StAX « XML « Java

1. Java
2. XML
3. StAX

Create a StAX Event Tree Viewer

   

import java.awt.BorderLayout;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Iterator;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.Characters;
import javax.xml.stream.events.DTD;
import javax.xml.stream.events.StartDocument;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;

public class StAXEventTreeViewer extends JFrame {
  DefaultMutableTreeNode base = new DefaultMutableTreeNode("XML File");
  DefaultTreeModel defaultTreeModel= new DefaultTreeModel(base);
  private JTree jTree= new JTree(defaultTreeModel);

  public StAXEventTreeViewer()throws XMLStreamException, FileNotFoundException {
    setSize(800, 650);
    buildTree(defaultTreeModel, base, new File("yourXML.xml"));
    getContentPane().add(new JScrollPane(jTree), BorderLayout.CENTER);
    setVisible(true);
  }

  public static void main(String[] args) throws Exception {
    new StAXEventTreeViewer();
  }

  public void buildTree(DefaultTreeModel treeModel, DefaultMutableTreeNode current, File file)
      throws XMLStreamException, FileNotFoundException {

    XMLInputFactory inputFactory = XMLInputFactory.newInstance();
    XMLEventReader reader = inputFactory.createXMLEventReader(new FileInputStream(file));
    while (reader.hasNext()) {
      XMLEvent event = reader.nextEvent();
      switch (event.getEventType()) {
      case XMLStreamConstants.START_DOCUMENT:
        StartDocument startDocument = (StartDocument) event;
        DefaultMutableTreeNode version = new DefaultMutableTreeNode(startDocument.getVersion());
        current.add(version);

        current.add(new DefaultMutableTreeNode(startDocument.isStandalone()));
        current.add(new DefaultMutableTreeNode(startDocument.standaloneSet()));
        current.add(new DefaultMutableTreeNode(startDocument.encodingSet()));
        current.add(new DefaultMutableTreeNode(startDocument.getCharacterEncodingScheme()));
        break;
      case XMLStreamConstants.START_ELEMENT:
        StartElement startElement = (StartElement) event;
        QName elementName = startElement.getName();

        DefaultMutableTreeNode element = new DefaultMutableTreeNode(elementName.getLocalPart());
        current.add(element);
        current = element;

        if (!elementName.getNamespaceURI().equals("")) {
          String prefix = elementName.getPrefix();
          if (prefix.equals("")) {
            prefix = "[None]";
          }
          DefaultMutableTreeNode namespace = new DefaultMutableTreeNode("prefix="
              + prefix + ",URI=" + elementName.getNamespaceURI());
          current.add(namespace);
        }

        for (Iterator it = startElement.getAttributes(); it.hasNext();) {
          Attribute attr = (Attribute) it.next();
          DefaultMutableTreeNode attribute = new DefaultMutableTreeNode("Attribute (name="
              + attr.getName().getLocalPart() + ",value=" + attr.getValue() + "')");
          String attURI = attr.getName().getNamespaceURI();
          if (!attURI.equals("")) {
            String attPrefix = attr.getName().getPrefix();
            if (attPrefix.equals("")) {
              attPrefix = "[None]";
            }
            attribute.add(new DefaultMutableTreeNode("prefix = " + attPrefix + ", URI = " + attURI));
          }
          current.add(attribute);
        }
        break;
      case XMLStreamConstants.END_ELEMENT:
        current = (DefaultMutableTreeNode) current.getParent();
        break;
      case XMLStreamConstants.CHARACTERS:
        Characters characters = (Characters) event;
        if (!characters.isIgnorableWhiteSpace() && !characters.isWhiteSpace()) {
          String data = characters.getData();
          if (data.length() != 0) {
            current.add(new DefaultMutableTreeNode(characters.getData()));
          }
        }
        break;
      case XMLStreamConstants.DTD:
        DTD dtde = (DTD) event;
        current.add(new DefaultMutableTreeNode(dtde.getDocumentTypeDeclaration()));
      default:
        System.out.println(event.getClass().getName());
      }
    }
  }
}

   
    
  

Related examples in the same category