source: main/trunk/greenstone3/src/java/org/greenstone/gsdl3/action/ProcessAction.java@ 28964

package org.greenstone.gsdl3.action;

import org.greenstone.gsdl3.core.ModuleInterface;
import org.greenstone.gsdl3.util.*;
// XML classes
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import java.util.HashMap;
import java.util.Map;
import java.util.Iterator;
import java.io.File;
import java.io.Serializable;

public class ProcessAction extends Action
{

    /** process a request */
    public Node process(Node message_node)
    {
        Element message = GSXML.nodeToElement(message_node);
        Document doc = message.getOwnerDocument();
        
        // the result
        Element result = doc.createElement(GSXML.MESSAGE_ELEM);
        Element page_response = doc.createElement(GSXML.RESPONSE_ELEM);
        result.appendChild(page_response);

        // assume only one request
        Element request = (Element) GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);

        // 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 = (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);
        UserContext userContext = new UserContext(request);
        // 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("d"))
        {
            // if rt=s or rt=r, do the request

            Element mr_query_message = doc.createElement(GSXML.MESSAGE_ELEM);
            String request_type_att;
            Element param_list = null;
            if (request_type.equals("s"))
            { // status
                request_type_att = GSXML.REQUEST_TYPE_STATUS;
                param_list = doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
                Element param = doc.createElement(GSXML.PARAM_ELEM);
                param.setAttribute(GSXML.NAME_ATT, GSParams.PROCESS_ID);
                param.setAttribute(GSXML.VALUE_ATT, (String) params.get(GSParams.PROCESS_ID));
                param_list.appendChild(param);
            }
            else
            {
                request_type_att = GSXML.REQUEST_TYPE_PROCESS;
                // 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 = doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
                    GSXML.addParametersToList(param_list, service_params);
                }

            }
            Element mr_query_request = GSXML.createBasicRequest(doc, request_type_att, to, userContext);
            if (param_list != null)
            {
                mr_query_request.appendChild(param_list);
            }
            mr_query_message.appendChild(mr_query_request);

            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
                return result_response;
            }

            // else append the contents of the response to the page - just the status elem for now
            Element status = (Element) GSXML.getChildByTagName(result_response, GSXML.STATUS_ELEM);
            page_response.appendChild(doc.importNode(status, true));
        }

        // another part of the page is the service description

        // request the service info for the selected service - should be cached
        Element mr_info_message = doc.createElement(GSXML.MESSAGE_ELEM);
        Element mr_info_request = GSXML.createBasicRequest(doc, GSXML.REQUEST_TYPE_DESCRIBE, to, userContext);
        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);
        Element description = (Element) doc.importNode(GSXML.getNodeByPath(mr_info_response, path), true);

        page_response.appendChild(description);

        return result;
    }

    protected Element getServiceParamList(Element cgi_param_list)
    {
        Document doc = cgi_param_list.getOwnerDocument();
        
        Element new_param_list = doc.createElement(GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
        Element param;
        NodeList cgi_params = cgi_param_list.getChildNodes();
        for (int i = 0; i < cgi_params.getLength(); i++)
        {
            Element p = (Element) cgi_params.item(i);
            String name = p.getAttribute(GSXML.NAME_ATT);
            if (name.equals(GSParams.SERVICE) || name.equals(GSParams.REQUEST_TYPE) || name.equals(GSParams.CLUSTER))
            {
                continue;
            }
            // else add it in to the list
            new_param_list.appendChild(doc.importNode(p, true));
        }
        return new_param_list;
    }
}