source: greenstone3/trunk/src/java/org/greenstone/gsdl3/action/GeneralAction.java@ 19851

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));
    //A shortcut action serving the flax web page requests
    if(request.getAttribute(GSXML.SUBACTION_ATT).equals(GSXML.FLAX_PAGE_GENERATION)
            && request.getAttribute(GSXML.TO_ATT).equals(GSXML.FLAX_PAGE_GENERATION)) {
        //
        Element mr_info_response = (Element) this.mr.process(message);
        Node flaxPageNode = (mr_info_response.getElementsByTagName(GSXML.FLAX_PAGE)).item(0);
        //logger.info(" raw page="+this.converter.getString(flaxPageNode));
        if(flaxPageNode != null){
            page_response.appendChild((Element)this.doc.importNode(flaxPageNode, true));
        }
        return result;      
    }
    
    // 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);
    String lang = request.getAttribute(GSXML.LANG_ATT);
    String uid = request.getAttribute(GSXML.USER_ID_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;
    if (cluster_name != null) {
        to = GSPath.appendLink(cluster_name, service_name);
    } else {
        to = service_name;
    }

    if (request_type.equals("r")) {
        //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);
        
        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
        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));
    }

    return result;
    }

}