source: trunk/gsdl3/src/java/org/greenstone/gsdl3/collection/XMLCollection.java@ 5266

package org.greenstone.gsdl3.collection;

import org.greenstone.gsdl3.util.*;
import org.greenstone.gsdl3.core.*;
import org.greenstone.gsdl3.service.*;


// java XML classes we're using
import org.w3c.dom.Document; 
import org.w3c.dom.Node; 
import org.w3c.dom.Element; 
import org.w3c.dom.NodeList; 

import java.io.File;
import java.util.HashMap;

/* for a collection that hasn't been built with greenstone build stuff. expects a documentList in the collectionConfig file, and it stores this. this is where doc level metadata comes from */
public class XMLCollection 
    extends Collection {

    protected Element document_list = null;
    /** overwrite this to keep the document list
     * find the metadata and display elems from the two config files and add it to the appropriate lists
     */
    protected boolean findAndLoadInfo(Element coll_config_xml, 
                      Element build_config_xml){

    // metadata
    Element meta_list = (Element)GSXML.getChildByTagName(coll_config_xml, GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
    addMetadata(meta_list);
    meta_list = (Element)GSXML.getChildByTagName(build_config_xml, GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
    addMetadata(meta_list);

    meta_list = this.doc.createElement(GSXML.METADATA_ELEM + GSXML.LIST_MODIFIER);
    GSXML.addMetadata(this.doc, meta_list, "httpPath", this.site_http_address+"/collect/"+this.cluster_name);
    addMetadata(meta_list);

    // display stuff
    Element display_list = (Element)GSXML.getChildByTagName(coll_config_xml, GSXML.DISPLAY_TEXT_ELEM+GSXML.LIST_MODIFIER);
    if (display_list != null) {
        addDisplayItems(display_list);
    }

    Element config_doc_list = (Element)GSXML.getChildByTagName(coll_config_xml, GSXML.DOCUMENT_ELEM+GSXML.LIST_MODIFIER);
    if (config_doc_list != null) {
        document_list = (Element)this.doc.importNode(config_doc_list, true);
    } else {
        document_list = this.doc.createElement(GSXML.DOCUMENT_ELEM+GSXML.LIST_MODIFIER);
    }
    return true;

    }

    /** handles requests made to the ServiceCluster itself 
     *
     * @param req - the request Element- <request>
     * @return the result Element - should be <response>
     */
    protected Element processMessage(Element request) {

    Element response = this.doc.createElement(GSXML.RESPONSE_ELEM);
    response.setAttribute(GSXML.FROM_ATT, this.cluster_name);
    String type = request.getAttribute(GSXML.TYPE_ATT);
    String lang = request.getAttribute(GSXML.LANG_ATT);
    response.setAttribute(GSXML.TYPE_ATT, type);
    
    if (type.equals(GSXML.REQUEST_TYPE_DESCRIBE)) {
        // create the collection element
        Element description = (Element)this.description.cloneNode(false);
        response.appendChild(description);
        // check the param list
        Element param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
        if (param_list == null) {
        addAllDisplayInfo(description, lang);
        description.appendChild(this.service_list);
        description.appendChild(this.metadata_list);
        description.appendChild(this.document_list);
        return response;
        }
        
        // go through the param list and see what components are wanted
        NodeList params = param_list.getElementsByTagName(GSXML.PARAM_ELEM);
        for (int i=0; i<params.getLength(); i++) {
        
        Element param = (Element)params.item(i);
        // Identify the structure information desired
        if (param.getAttribute(GSXML.NAME_ATT) == GSXML.SUBSET_PARAM ) {
            String info = param.getAttribute(GSXML.VALUE_ATT);
            if (info.equals(GSXML.SERVICE_ELEM+GSXML.LIST_MODIFIER)) {
            description.appendChild(this.service_list);
            } else if (info.equals(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER)) {
            description.appendChild(metadata_list);
            } else if (info.equals(GSXML.DISPLAY_TEXT_ELEM+GSXML.LIST_MODIFIER)) {
            addAllDisplayInfo(description, lang);
            
            } else if (info.equals(GSXML.DOCUMENT_ELEM+GSXML.LIST_MODIFIER)) {
            description.appendChild(this.document_list);
            }
            
        }
        }
        return response;
    }
    
    if (type.equals(GSXML.REQUEST_TYPE_SYSTEM)) {
        response = processSystemRequest(request);
    } else { // unknown type
        System.err.println("ServiceCluster Error: cant handle request of type "+ type);
        
    }
    return response;
    }

}