import javax.xml.parsers.*;
import java.io.IOException;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
import org.xml.sax.InputSource;

public class CallXMLDOM 
{
  private static DocumentBuilderFactory documentBuilderFactory;

  public static synchronized DocumentBuilderFactory getDocumentBuilderFactory()
  {
    if( CallXMLDOM.documentBuilderFactory == null )
    {
      // configure the document builder factory
      documentBuilderFactory = DocumentBuilderFactory.newInstance();
      documentBuilderFactory.setValidating(true);
      documentBuilderFactory.setNamespaceAware(true);
    }
    return CallXMLDOM.documentBuilderFactory;
  }

  public static Document getDocument(InputSource is)
    throws ParserConfigurationException, SAXException, IOException
  {
    // get a builder to create a DOM document
    DocumentBuilder builder = CallXMLDOM.getDocumentBuilderFactory().newDocumentBuilder();

    // parse the damned document
    return builder.parse(is);
  }

}