source: trunk/gsdl3/src/java/org/greenstone/gsdl3/action/QueryAction.java@ 3346

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.Text; 
import org.w3c.dom.Document; 
import org.w3c.dom.Element; 

import java.util.HashMap;

public class QueryAction extends Action {
    

    public String process (String xml_in) {

    Element message = converter_.getDOM(xml_in).getDocumentElement();
    Element request = (Element)message.getElementsByTagName("request").item(0);
    
    String info = request.getAttribute("info");
    // remove the q/ bit
    info = GSPath.removeFirstLink(info);
    String query_type = GSPath.getFirstLink(info);
    
    if (query_type.equals("")) {
        query_type = "text";
    }

    if (query_type.equals("text")) {
        return textQuery(request);
    }
    if (query_type.equals("field")) {
        return fieldQuery(request);
    }
    return unknownQuery(request);

    
    }
    
    protected String textQuery(Element request) {

    Element query_request = doc_.createElement("message");
    query_request.appendChild(doc_.importNode(request, true));

    String stylesheet = GSFile.stylesheetPath(config_, "textquery.xsl");
    
    //String stylesheet = GSFile.stylesheetPath(gsdl_home_, site_home_,
    //                    display_home_, "textquery.xsl");
    if (stylesheet==null) {
        return GSHTML.errorPage("textquery stylesheet not found!");
    }
    
    HashMap params = GSXML.extractParams((Element)GSXML.getChildByTagName(request, "paramList"));
    String query = (String)params.get("q");
    if (query==null|| query.equals("")) {
        // if there is no q set, just output the search box
        String transformed_result = transformer_.transform(stylesheet,
                                   query_request);    
        return transformed_result;
    }
    
    // else do the request, output search box and results
    Element mr_message = doc_.createElement("message");
    Element mr_request = doc_.createElement("request");
    mr_message.appendChild(mr_request);

    mr_request.setAttribute("type", "query");
    String to = (String)params.get("c"); // collection name
    to = GSPath.appendLink(to, "TextQuery");
    mr_request.setAttribute("to", to);
    
    // ignore paramList for now
    Element paramList = doc_.createElement("paramList");
    mr_request.appendChild(paramList);

    // content - contains the query string
    Element content = doc_.createElement("content");
    Text text = doc_.createTextNode(query);
    content.appendChild(text);
    mr_request.appendChild(content);
    //return GSHTML.errorPage(GSHTML.htmlSafe(converter_.getString(mr_message)));

    Element result1 = (Element)mr_.process(mr_message);
    // this result is the list of docs.
    // now take that list, and get the Titles
    // for now, just create a whole new request

    Element resource_list = (Element)result1.getElementsByTagName("resourceList").item(0); // should always be a resource list - but it may be empty

    Element first_resource = (Element)GSXML.getChildByTagName(resource_list, "resource");
    if (first_resource == null) { // no docs found - dont bother getting metadata
        Element result_response = (Element)GSXML.getChildByTagName(result1, "response");
        
        query_request.appendChild(doc_.importNode(result_response, true));
        
        String transformed_result = transformer_.transform(stylesheet,
                                   query_request);
        
        return transformed_result;
    }
    // get the Title metadata
    Element mr_message2 = doc_.createElement("message");
    Element mr_request2 = doc_.createElement("request");
    mr_message2.appendChild(mr_request2);

    mr_request2.setAttribute("type", "query");
    to = (String)params.get("c"); // collection name
    to = GSPath.appendLink(to, "MetadataRetrieve");
    mr_request2.setAttribute("to", to);
    Element content2 = doc_.createElement("content");
    mr_request2.appendChild(content2);

    // the first part of the content is the doc list
    content2.appendChild(doc_.importNode(resource_list, true));

    // the second part of the content is the metadata list
    Element metadata_list = doc_.createElement("metadataList");
    Element title = doc_.createElement("element");
    title.setAttribute("name", "Title");
    metadata_list.appendChild(title);
    content2.appendChild(metadata_list);

    //return GSHTML.errorPage(GSHTML.htmlSafe(converter_.getString(mr_request2)));
    Element result2 = (Element)mr_.process(mr_message2);
    
    Element result2_response = (Element)GSXML.getChildByTagName(result2, "response");
    
    query_request.appendChild(doc_.importNode(result2_response, true));
    //return GSHTML.errorPage(GSHTML.htmlSafe(converter_.getString(query_request)));

    String transformed_result = transformer_.transform(stylesheet,
                           query_request);
    
    return transformed_result;
    
    }

    protected String fieldQuery(Element request) {
    return GSHTML.errorPage("field query not implemented");


    }
    protected String unknownQuery(Element request) {

    return GSHTML.errorPage("unknown query subtype - unknown query not implemented");
    }
}