source: trunk/gsdl3/src/java/org/greenstone/gsdl3/action/ProcessAction.java@ 3645

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 {
    
    public static final String PROCESS_ONLY_ARG="p";

    /** add the action specific args to the GSCGI object */
    protected void addCGIParams() {
    cgi_.addStaticParam(PROCESS_ONLY_ARG);
    
    }
    /** process a request */
    public Element process (Element message) {

    // assume only one request
    Element request = (Element)GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
    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);
    String service_name = (String) params.get(GSCGI.SERVICE_ARG);
    String cluster_name = (String) params.get(GSCGI.CLUSTER_ARG);
    String process_p = (String)params.get(PROCESS_ONLY_ARG);
    boolean process_only = false;
    if (process_p!=null) {
        process_only = (((String)params.get(PROCESS_ONLY_ARG)).equals("1")?true:false);
    }
    // the return page
    Element page = doc_.createElement(GSXML.PAGE_ELEM);
    page.setAttribute(GSXML.LANG_ATT, request.getAttribute(GSXML.LANG_ATT));

    // what is carried out depends on the subaction 
    // if sa=d, then a describe request is done,
    // is sa=r, a request and then a describe request is done
    // if sa=s, a status request is done.

    // if p=1, then this calls for a process only page - we do the request
    // (sa 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 (!process_only) {
        // check that the stylesheet is present
        if (stylesheet==null) {
        System.err.println("ProcessAction Error: build stylesheet not found!");
        return null;
        }
    }

    // where to send requests
    String to = cluster_name; 
    to = GSPath.appendLink(to, service_name);

    if (!subaction.equals("d")) {
        // if sa=s or sa=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);
        
        if (subaction.equals("s")) { // status
        mr_query_request.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_STATUS);
        } else {
        mr_query_request.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_PROCESS);
        }
        mr_query_request.setAttribute(GSXML.LANG_ATT, page.getAttribute(GSXML.LANG_ATT)); 
        mr_query_request.setAttribute(GSXML.TO_ATT, to);
        
        // add the param list as is 
        Element query_param_list = (Element)doc_.importNode(cgi_param_list, true);
        mr_query_request.appendChild(query_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 (process_only) {
        // just send the reponse as is
        return result_response;
        }
        
        // else append the response to the page
        page.appendChild(doc_.importNode(result_response, 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.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 cgi_request = (Element)doc_.importNode(request, true);
    page.appendChild(cgi_request);
    
    System.out.println("process action, page=");
    System.out.println(converter_.getString(page));
    // 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);    
    }

    
}