source: trunk/gsdl3/src/java/org/greenstone/gsdl3/action/ProcessAction.java@ 4001

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) {

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

    // we ignore the subaction for now - all types are processed by the same method
    //String subaction = request.getAttribute(GSXML.SUBACTION_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(GSCGI.SERVICE_ARG);
    String cluster_name = (String) params.get(GSCGI.CLUSTER_ARG);
    String request_only_p = (String)params.get(GSCGI.REQUEST_ONLY_ARG);
    boolean request_only = false;
    if (request_only_p!=null) {
        request_only = (request_only_p.equals("1")?true:false);
    }
    String request_type = (String) params.get(GSCGI.REQUEST_TYPE_ARG);
    // the return page
    Element page = doc_.createElement(GSXML.PAGE_ELEM);
    page.setAttribute(GSXML.LANG_ATT, request.getAttribute(GSXML.LANG_ATT));

    // the page response goes into a pageResponse elem
    Element page_response = doc_.createElement(GSXML.PAGE_RESPONSE_ELEM);
    page.appendChild(page_response);
    // 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

    //the stylesheet
    String stylesheet = GSFile.stylesheetFile(config_, "process.xsl");
    
    if (!request_only) {
        // check that the stylesheet is present
        if (stylesheet==null) {
        System.err.println("ProcessAction Error: process stylesheet not found!");
        return null;
        }
    }

    // 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);
        Element mr_query_request = doc_.createElement(GSXML.REQUEST_ELEM);
        mr_query_message.appendChild(mr_query_request);
        
        mr_query_request.setAttribute(GSXML.LANG_ATT, page.getAttribute(GSXML.LANG_ATT)); 
        mr_query_request.setAttribute(GSXML.TO_ATT, to);
        
        Element param_list;
        if (request_type.equals("s")) { // status
        mr_query_request.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_STATUS);
        // only need the handle param
        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 {
        mr_query_request.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
        // add in the params - except the ones only used by the action
        param_list = getServiceParamList(cgi_param_list);
        
        }
        mr_query_request.appendChild(param_list);
    
        
        Element mr_query_response = (Element)mr_.process(mr_query_message);
        Element result_response = (Element)GSXML.getChildByTagName(mr_query_response, GSXML.RESPONSE_ELEM);
        
        if (request_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));
    }
    
    // add the lang stuff from message
    page.appendChild(doc_.importNode(GSXML.getChildByTagName(message, GSXML.DISPLAY_ELEM), true));
    // add the system stuff from message
    page.appendChild(doc_.importNode(GSXML.getChildByTagName(message, GSXML.CONFIGURATION_ELEM), 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 = doc_.createElement(GSXML.REQUEST_ELEM);
    mr_info_message.appendChild(mr_info_request);
    mr_info_request.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_DESCRIBE);
    mr_info_request.setAttribute(GSXML.LANG_ATT, page.getAttribute(GSXML.LANG_ATT));

    mr_info_request.setAttribute(GSXML.TO_ATT, to);
    
    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);

    Element pl = (Element)GSXML.getChildByTagName(description, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
    
    if (pl !=null) {
        // add short names to the params in the param list
        cgi_.paramListAddShortNames(pl);

        // for each param in the description, overwrite teh default value with the currently set value if present 
        Element param = (Element)pl.getFirstChild();
        while (param !=null) {
        if (param.getNodeName().equals(GSXML.PARAM_ELEM)) { // just in case
            String name = param.getAttribute(GSXML.NAME_ATT);
            String current = (String)params.get(name);
            if (current !=null && !current.equals("")) {
            param.setAttribute(GSXML.DEFAULT_ATT, current);
            }
        }
        param = (Element)param.getNextSibling();
        }
    }
    page_response.appendChild(description);

    // part of the data for the page is the cgi-params
    // if we have this here, do we need to do the previous step?
    Element page_request = GSXML.duplicateWithNewName(doc_, request, GSXML.PAGE_REQUEST_ELEM, true);
    page.appendChild(page_request);
        
    // now process the page and return the result
    Document style_doc = converter_.getDOM(new File(stylesheet));
    
    GSXSLT.absoluteIncludePaths(style_doc, config_);
    return (Element)transformer_.transform(style_doc, page);    
    }

    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;
        }
        // esle add it in to the list
        new_param_list.appendChild(doc_.importNode(p, true));
    }
    return new_param_list;
    }
}