jdomurl.java

webwork source

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

import java.net.URL;
import java.net.MalformedURLException;

import org.jdom.Document;
import org.jdom.input.SAXBuilder;
import org.apache.commons.logging.*;

import webwork.action.ActionSupport;
import webwork.action.ResultException;
import webwork.action.CommandDriven;

import webwork.action.ServletRequestAware;
import javax.servlet.http.HttpServletRequest;


/**
 *	A simple Action used to fetch a remote URL, parse it using JDOM,
 * and make the result available to the View.
 *      
 *	@author Maurice C. Parker ([e-mail])
 *	@version $Revision: 1.5 $
 */
public class JDOMUrl
   extends ActionSupport
   implements CommandDriven, ServletRequestAware
{

   // Attributes ----------------------------------------------------
   String url;
   Document document;
   HttpServletRequest request;

   // Public --------------------------------------------------------
   public void setUrl(String url)
   {
      this.url = url;
   }

   public String getUrl()
   {
      return url;
   }

   public Document getDocument()
   {
      return document;
   }

   public void setServletRequest(HttpServletRequest request)
   {
      this.request = request;
   }

   protected void doValidation()
   {
      if (url == null)
      {
         addErrorMessage("No source selected");
      }
   }

   protected String doExecute()
      throws Exception
   {
      URL xmlUrl;

      try
      {
         xmlUrl = new URL(url);
      } catch (MalformedURLException e)
      {
         addErrorMessage("Not a valid URL");
         return ERROR;
      }

      try
      {
         SAXBuilder builder = new SAXBuilder();
         document = builder.build(xmlUrl);
      } catch (Exception e)
      {
         LogFactory.getLog(getClass()).error("Could not load XML document", e);
         return ERROR;
      }

      return SUCCESS;
   }

   protected String buildUrl(String uri) {
      return request.getScheme() + "://" + request.getServerName() + ":" +
            request.getServerPort() + request.getContextPath() + "/" + uri;
   }
}