source: main/trunk/greenstone3/src/java/org/greenstone/gsdl3/action/GeneralAction.java@ 24866

package org.greenstone.gsdl3.action;

import org.greenstone.gsdl3.util.*;
// XML classes
import org.w3c.dom.Node;
import org.w3c.dom.Element;

import java.util.HashMap;

public class GeneralAction extends Action
{

    /** process a request */
    public Node process(Node message_node)
    {

        Element message = this.converter.nodeToElement(message_node);

        // the result
        Element result = this.doc.createElement(GSXML.MESSAGE_ELEM);
        Element page_response = this.doc.createElement(GSXML.RESPONSE_ELEM);
        result.appendChild(page_response);

        // assume only one request
        Element request = (Element) GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
        logger.debug(" request=" + this.converter.getString(request));

        String lang = request.getAttribute(GSXML.LANG_ATT);
        String uid = request.getAttribute(GSXML.USER_ID_ATT);

        // get the param list
        Element cgi_param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
        HashMap params = GSXML.extractParams(cgi_param_list, false);
        String service_name = (String) params.get(GSParams.SERVICE);
        String cluster_name = (String) params.get(GSParams.CLUSTER);
        String response_only_p = (String) params.get(GSParams.RESPONSE_ONLY);
        boolean response_only = false;
        if (response_only_p != null)
        {
            response_only = (response_only_p.equals("1") ? true : false);
        }
        String request_type = (String) params.get(GSParams.REQUEST_TYPE);
        // what is carried out depends on the request_type
        // if rt=d, then a describe request is done,
        // is rt=r, a request and then a describe request is done
        // if rt=s, a status request is done.

        // if ro=1, then this calls for a process only page - we do the request
        // (rt should be r or s) and just give the response straight back
        // without any page processing

        // where to send requests
        String to;
        if (cluster_name != null)
        {
            to = GSPath.appendLink(cluster_name, service_name);
        }
        else
        {
            to = service_name;
        }

        if (request_type.equals("r") || request_type.equals("s"))
        {
            //do the request

            Element mr_query_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
            Element mr_query_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PROCESS, to, lang, uid);
            
            if(request_type.equals("s"))
            {
                mr_query_request.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_STATUS);
            }

            mr_query_message.appendChild(mr_query_request);

            Element param_list = null;
            // add in the service params - except the ones only used by the action
            HashMap service_params = (HashMap) params.get("s1");
            if (service_params != null)
            {
                param_list = this.doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
                GSXML.addParametersToList(this.doc, param_list, service_params);
                mr_query_request.appendChild(param_list);
            }

            Element mr_query_response = (Element) this.mr.process(mr_query_message);
            Element result_response = (Element) GSXML.getChildByTagName(mr_query_response, GSXML.RESPONSE_ELEM);

            if (response_only)
            {
                // just send the reponse as is
                addSiteMetadata(result_response, lang, uid);
                return result_response;
            }
            if (result_response != null)
            {
                // else append the contents of the response to the page 
                GSXML.copyAllChildren(page_response, result_response);
            }
        }

        // another part of the page is the service description

        // request the service info for the selected service - should be cached
        Element mr_info_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
        Element mr_info_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_DESCRIBE, to, lang, uid);
        mr_info_message.appendChild(mr_info_request);
        Element mr_info_response = (Element) this.mr.process(mr_info_message);
        
        String path = GSXML.RESPONSE_ELEM;
        path = GSPath.appendLink(path, GSXML.SERVICE_ELEM);

        Node desNode = GSXML.getNodeByPath(mr_info_response, path);
        if (desNode != null)
        {
            page_response.appendChild((Element) this.doc.importNode(desNode, true));
        }

        addSiteMetadata(page_response, lang, uid);
        
        return result;
    }

}