source: main/trunk/greenstone3/src/java/org/greenstone/gsdl3/action/RSSAction.java@ 31906

package org.greenstone.gsdl3.action;

import org.greenstone.gsdl3.util.*;

// XML classes
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.Element;

// other java stuff
import java.util.*;
import java.io.Serializable;
import java.io.PrintWriter;
import java.io.Serializable;
import java.io.StringWriter;

import org.apache.log4j.*;

public class RSSAction extends Action
{

    static Logger logger = Logger.getLogger(org.greenstone.gsdl3.action.RSSAction.class.getName());

    /** process a request */
    public Node process(Node message_node)
    {
        
        Element message = GSXML.nodeToElement(message_node);
        Document doc = message.getOwnerDocument();
        
        // assume only one request
        Element request = (Element) GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);

        UserContext userContext = new UserContext(request);
        // get the param list
        Element cgi_param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
        HashMap<String, Serializable> params = GSXML.extractParams(cgi_param_list, false);

        String service_name = "RSSFeed"; // RSSFeed service of RSSRetrieve.java
        String collection = (String) params.get(GSParams.COLLECTION);
        String to = GSPath.prependLink(service_name, collection); // collection/RSSFeed
        // Get baseUrl for links in RSS Feed
        String baseUrl = request.getAttribute("baseURL");
        
        
        // the first part of the response is the service description 
        // for now get this again from the service. 
        // this should be cached somehow later on. 
    
        Element mr_request_message = doc.createElement(GSXML.MESSAGE_ELEM);
        Element rss_request = GSXML.createBasicRequest(doc, GSXML.REQUEST_TYPE_PROCESS, to, userContext);
        //Pass baseURL to processRSSFeed
        rss_request.setAttribute("baseURL", baseUrl);
        mr_request_message.appendChild(rss_request);
        
        Element rss_response = (Element) this.mr.process(mr_request_message);
        rss_response = (Element) GSXML.getChildByTagName(rss_response, GSXML.RESPONSE_ELEM); // just the response tag
        if (rss_response == null) {
          //RSS service not available
          rss_response = doc.createElement(GSXML.RESPONSE_ELEM);
          
          GSXML.addError(rss_response, "RSS service not available for this collection");
        }
        // NEED ERROR PROCESSING ?

        // siteMeta and interfaceOptions are unnecessary, as rss.xsl is going to remove it anyway
        // but may be handy when doing o=xml to view the original xml as it came through from the GS server
        addSiteMetadata(rss_response, userContext);
        addInterfaceOptions(rss_response);

        Element result = doc.createElement(GSXML.MESSAGE_ELEM);
        result.appendChild(doc.importNode(rss_response, true));
        return result;

    }

}