cedric 01/10/08 06:39:24
Added: contrib/tiles/src/tutorial/org/apache/struts/example/tiles/rssChannel
Channels.java
Log:
Rss Channel example
Revision Changes Path
1.1
jakarta-struts/contrib/tiles/src/tutorial/org/apache/struts/example/tiles/rssChannel/Channels.java
Index: Channels.java
===================================================================
package org.apache.struts.example.tiles.rssChannel;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//import org.apache.portlet.PortletDataHashMap;
import org.apache.commons.digester.rss.RSSDigester;
import org.apache.commons.digester.rss.Channel;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.tiles.ComponentContext;
/**
* Read and parse RSS files found at on a given
* list in user request or session, save the Channel
* beans in request scope,and forward to "continue".
* @expects path={uri} on command line or as parameter property to ActionMapping.
* @expects an input page or error forwarding if exception digesting RSS
* @author Ted Husted
* @version $Revision: 1.1 $ $Date: 2001/10/08 13:39:24 $
*/
public final class Channels extends Action {
/**
* Tile attribute key for saving Channel bean
*/
public static final String CHANNELS_KEY = "CHANNELS";
/**
* Tile attribute key for getting Channel urls list
*/
public static final String CHANNEL_URLS_KEY = "urls";
/**
* Tile attribute key for getting Channel url attribute
*/
public static final String CHANNEL_URL_KEY = "url";
// --------------------------------------------------------- Instances Variables
// --------------------------------------------------------- Public Methods
/**
* Main process of class. Reads, parses
*/
public ActionForward perform(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
System.out.println( "Enter Rss Channel Action" );
// Try to retrieve tile context
ComponentContext context = ComponentContext.getContext( request );
if( context == null )
{
throw new ServletException( "This action must be called by a Tile, not
directly" );
}
ActionErrors errors = new ActionErrors();
org.apache.commons.digester.rss.Channel channel = null;
// -- Retrieve parameters --
// Urls can come from a list, or from a single attribute.
List channels = (List)context.getAttribute( CHANNEL_URLS_KEY );
if( channels == null )
{
Object url = context.getAttribute( CHANNEL_URL_KEY );
channels = new ArrayList(1);
channels.add(url);
}
//channels.add("http://www.newsforge.com/newsforge.rss";);
//channels.add("http://xmlhack.com/rss.php";);
//channels.add("http://lwn.net/headlines/rss";);
// channels.trimToSize();
System.out.println( "urls count" + channels.size() ) ;
// -- Loop through channels --
ArrayList channelBeans = new ArrayList(channels.size());
try {
for (int i=0; i<channels.size(); i++) {
RSSDigester digester = new RSSDigester();
Channel obj = (Channel)digester.parse((String)channels.get(i));
System.out.println( "Channel:" + obj) ;
//System.out.println( "Channel.items:" + obj.getI) ;
channelBeans.add(obj);
}
}
catch (Throwable t) {
errors.add(ActionErrors.GLOBAL_ERROR,
new ActionError("rss.access.error"));
servlet.log(t.toString());
}
// -- Handle Errors ---
if (!errors.empty()) {
saveErrors(request, errors);
if (mapping.getInput()!=null)
return (new ActionForward(mapping.getInput()));
// If no input page, use error forwarding
System.out.println( "Exit Rss Channel Action : error" );
return (mapping.findForward("error"));
}
// -- Save Bean, and Continue ---
System.out.println( "Exit Rss Channel Action" );
//request.setAttribute(CHANNELS_KEY,channelBeans);
// Use Tile context to pass channels
context.putAttribute( CHANNELS_KEY,channelBeans);
return (mapping.findForward("continue"));
} // ---- End perform ----
} // ---- End Fetch ----
/*
* $Header:
/home/cvs/jakarta-struts/contrib/tiles/src/tutorial/org/apache/struts/example/tiles/rssChannel/Channels.java,v
1.1 2001/10/08 13:39:24 cedric Exp $
* $Revision: 1.1 $
* $Date: 2001/10/08 13:39:24 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
