DOM parser with all its actions displayed : DOM Action « XML « Java

1. Java
2. XML
3. DOM Action

DOM parser with all its actions displayed

  
import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

public class MainClass implements ErrorHandler {
  public static void main(String args[]) throws Exception {
    DocumentBuilderFactory builderFactory = DocumentBuilderFactory
        .newInstance();
    builderFactory.setNamespaceAware(true);
    builderFactory.setValidating(true);

    DocumentBuilder builder = null;
    builder = builderFactory.newDocumentBuilder(); 
    builder.setErrorHandler(new MainClass());
    Document xmlDoc = null;
    xmlDoc = builder.parse(new File("y.xml"));
    listNodes(xmlDoc); 
  }

  static void listNodes(Node node) {
    String nodeName = node.getNodeName(); 

    if (node instanceof Element) {
      if (node.hasAttributes()) { 
        NamedNodeMap attrs = node.getAttributes();
        for (int i = 0; i < attrs.getLength(); i++) {
          Attr attribute = (Attr) attrs.item(i); // Get an attribute
          System.out.println(" "+ attribute.getName()+ "="+attribute.getValue());
        }
      }
      System.out.println(indent + "<" + nodeName + ">");
    } else if (node instanceof Text) {
      System.out.println(((Text) node).getData());
    } else if (node instanceof DocumentType) {
      System.out.println(getDoctypeString((DocumentType) node));
    }

    indent.append(' '); 
    NodeList list = node.getChildNodes(); 
    if (list.getLength() > 0) { 
      for (int i = 0; i < list.getLength(); i++) { 
        listNodes(list.item(i)); 
      }
    }
    System.out.println("</" + nodeName + ">"); 

  }

  public void fatalError(SAXParseException spe) throws SAXException {
    System.out.println("Fatal error at line " + spe.getLineNumber());
    System.out.println(spe.getMessage());
    throw spe;
  }

  public void warning(SAXParseException spe) {
    System.out.println("Warning at line " + spe.getLineNumber());
    System.out.println(spe.getMessage());
  }

  public void error(SAXParseException spe) {
    System.out.println("Error at line " + spe.getLineNumber());
    System.out.println(spe.getMessage());
  }

  static StringBuffer indent = new StringBuffer("");

  private static String getDoctypeString(DocumentType doctype) {
    String str = doctype.getName();
    StringBuffer doctypeStr = new StringBuffer("<!DOCTYPE ").append(str);

    if ((str = doctype.getSystemId()) != null) {
      doctypeStr.append(" SYSTEM ").append('\"').append(str).append('\"');
    }
    if ((str = doctype.getPublicId()) != null) {
      doctypeStr.append(" PUBLIC ").append('\"').append(str).append('\"');
    }
    if ((str = doctype.getInternalSubset()) != null) {
      doctypeStr.append('[').append(str).append(']');
    }
    return doctypeStr.append('>').toString();
  }
}

   
  

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