xml.java

webwork source

/*
 * WebWork, Web Application Framework
 *
 * Distributable under Apache license.
 * See terms of license at opensource.org
 */
package webwork.action.standard;

import org.apache.commons.logging.*;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
import webwork.action.ActionSupport;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.net.URL;

/**
 *	XML "execution" wrapper.
 *
 *	@see <related>
 *	@author Rickard 謆erg ([e-mail])
 *	@version $Revision: 1.7 $
 */
public class XML
   extends ActionSupport
{
   // Static --------------------------------------------------------

   // Attributes ----------------------------------------------------
   String documentName;
   Document document;
   DocumentBuilder db;

   // Action implementation -----------------------------------------
   public String execute()
      throws Exception
   {
      try
      {
         URL documentUrl = getDocumentURL();
         document = parseDocument(documentUrl);
      } catch (Exception e)
      {
         return handleException(e);
      }

      return SUCCESS;
   }

   // Public --------------------------------------------------------
   public void setDocumentName(String documentName)
   {
      this.documentName = documentName;
   }

   public Document getDocument()
   {
      return document;
   }

   // Protected -----------------------------------------------------
   protected Document parseDocument(URL documentUrl)
       throws IOException, ParserConfigurationException, SAXException
   {
      //if (db == null)
      //{
	  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
	  //dbf.setValidating(true);
	  //dbf.setIgnoreComments(false);
	  //dbf.setIgnoreElementContentWhitespace(false);
	  //dbf.setCoalescing(false);
	  //dbf.setExpandEntityReferences(true);

	  db = dbf.newDocumentBuilder();
      //}

      Document doc = db.parse(documentUrl.openStream());
      return doc;
   }

   protected URL getDocumentURL()
   {
      URL documentUrl;
      String ext = documentName.substring(documentName.lastIndexOf("."));
      String realDocumentName = documentName.substring(0,documentName.length()-ext.length());
      realDocumentName = realDocumentName.replace('.','/');
      realDocumentName += ext;
      LogFactory.getLog(this.getClass()).debug("Document: "+realDocumentName);

      documentUrl = getClass().getClassLoader().getResource(realDocumentName);
      LogFactory.getLog(this.getClass()).debug("DocumentUrl: "+ documentUrl);
      return documentUrl;
   }

   protected String handleException(Exception e)
   {
      e.printStackTrace();
      return ERROR;
   }

}