source: trunk/gsdl3/src/java/org/greenstone/gsdl3/action/ProcessAction.java@ 4980

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;

public class ProcessAction extends Action {
    
    /** process a request */
    public Element process (Element message) {

    // 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 params = GSXML.extractParams(cgi_param_list, false);
    String service_name = (String) params.get(GSCGI.SERVICE_ARG);
    String cluster_name = (String) params.get(GSCGI.CLUSTER_ARG);
    String response_only_p = (String)params.get(GSCGI.RESPONSE_ONLY_ARG);
    boolean response_only = false;
    if (response_only_p!=null) {
        response_only = (response_only_p.equals("1")?true:false);
    }
    String request_type = (String) params.get(GSCGI.REQUEST_TYPE_ARG);
    String lang = request.getAttribute(GSXML.LANG_ATT);
    // 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 = cluster_name; 
    to = GSPath.appendLink(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;
        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, GSCGI.PROCESS_ID_ARG);
        param.setAttribute(GSXML.VALUE_ATT, (String)params.get(GSCGI.PROCESS_ID_ARG));
        param_list.appendChild(param);
        } else {
        request_type_att = GSXML.REQUEST_TYPE_PROCESS;
        // add in the params - except the ones only used by the action
        param_list = getServiceParamList(cgi_param_list);
        
        }
        Element mr_query_request = GSXML.createBasicRequest(doc_, request_type_att, to, lang);
        mr_query_request.appendChild(param_list);
        mr_query_message.appendChild(mr_query_request);
        
        Element mr_query_response = (Element)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, lang); //.createElement(GSXML.REQUEST_ELEM);
    mr_info_message.appendChild(mr_info_request);
    Element mr_info_response = (Element) 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) {

    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(GSCGI.SERVICE_ARG) || name.equals(GSCGI.REQUEST_TYPE_ARG) || name.equals(GSCGI.CLUSTER_ARG)) {
        continue;
        }
        // else add it in to the list
        new_param_list.appendChild(doc_.importNode(p, true));
    }
    return new_param_list;
    }
}