source: trunk/gsdl3/src/java/org/greenstone/gsdl3/service/GSDL2ClassifierServices.java@ 3512

/*
 *    GSDL2ClassifierServices.java
 *    Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.greenstone.gsdl3.service;

import org.greenstone.gdbm.*;
import org.greenstone.gsdl3.util.*;

import org.w3c.dom.Document; 
import org.w3c.dom.Node; 
import org.w3c.dom.Text; 
import org.w3c.dom.Element; 
import org.w3c.dom.NodeList; 
/**
 * A ServicesImpl class for GSDL2-style Classifiers
 *
 * @author <a href="mailto:[email protected]">Katherine Don</a>
 * @version $Revision: 3512 $
 */
public class GSDL2ClassifierServices 
    extends ServicesImpl {

    // the services on offer
    private static final String CLASSIFIER_SERVICE = "ClassifierBrowse";

    /** gdbm wrapper */
    private GDBMWrapper gdbm_src_=null;

    public GSDL2ClassifierServices() {
    gdbm_src_ = new GDBMWrapper();

    }
 
    /** processes the request */
    protected Element processService(String name, Element request) {

    if (!name.equals(CLASSIFIER_SERVICE)) {
        System.err.println("GSDL2ClassifierServices:should never get here. service type wrong:"+name);
    return null;
    }
    // the response element
    Element result = doc_.createElement(GSXML.RESPONSE_ELEM);
    String from = GSPath.appendLink(cluster_name_, CLASSIFIER_SERVICE);
    result.setAttribute(GSXML.FROM_ATT, from);
    result.setAttribute(GSXML.TYPE_ATT, GSXML.REQUEST_TYPE_QUERY);
    Element result_content = doc_.createElement(GSXML.CONTENT_ELEM);
    result.appendChild(result_content);

    // get the classifier name out of request content - assume only one for now
    String path = GSXML.CONTENT_ELEM;
    path = GSPath.appendLink(path, GSXML.RESOURCE_ELEM+GSXML.LIST_MODIFIER);
    path = GSPath.appendLink(path, GSXML.RESOURCE_ELEM);

    Element elem = (Element)GSXML.getNodeByPath(request, path);
    String elem_name = elem.getAttribute(GSXML.NAME_ATT);
    System.out.println("elem name="+elem_name);

    if (OID.needsTranslating(elem_name)) {
        System.out.println("translating oid");
        elem_name = gdbm_src_.translateOID(elem_name);
    }
    // get the info from gdbm db
    DBInfo info = gdbm_src_.getInfo(elem_name);

    // build up the XML
    Element classifier = doc_.createElement(GSXML.CLASSIFIER_ELEM);
    
    String classifier_name = OID.getTop(elem_name);
    classifier.setAttribute(GSXML.NAME_ATT, classifier_name);
    result_content.appendChild(classifier);
    DBInfo top_info;

    if (elem_name.equals(classifier_name)) { 
        top_info = info;
    } else {
        top_info = gdbm_src_.getInfo(classifier_name);
    }

    // a substitute template - should be read from config file
    //String extra = "<stylesheet xmlns:xsl='http://www.w3.org/1999/XSL/Transform'><xsl:template match='resource' priority='3'><xsl:param name='collName'>coll-name</xsl:param><xsl:variable name='library' select='ancestor::page/config/library_name'/><td><a href='{$library}?a=r&amp;c={$collName}&amp;r={@name}'><img src='interfaces/default/images/book.gif' width='18' height='11' border='0'/></a></td><td>***</td><td><xsl:value-of select='metadataList/metadata[@name=\"Title\"]'/></td></xsl:template></stylesheet>";
    //Element extra_doc = converter_.getDOM(extra).getDocumentElement();
    //result.appendChild(doc_.importNode(extra_doc, true));
    
    // get the classifier attributes
    String type = top_info.getInfo("childtype");
    if (type.equals("VList")) {
        
        classifier.setAttribute("type", "vertical");
        classifier.setAttribute("interleave", "true");
        classifier.setAttribute("link", "icon");
    }
    else if (type.equals("HList")){
        classifier.setAttribute("type", "horizontal");
        classifier.setAttribute("interleave", "false");
        classifier.setAttribute("link", "name");
    } else {
        System.out.println("unknown type!!! check this");
        classifier.setAttribute("type", "vertical");
        classifier.setAttribute("interleave", "true");
        classifier.setAttribute("link", "icon");
    }

    Element this_node;
    if (elem_name.equals(classifier_name)) {
        this_node = classifier;
    } else { // have to build up the parents 
        // the current node
        this_node = doc_.createElement("node");
        this_node.setAttribute("name", elem_name);
        type = info.getInfo("childtype");
        if (type.equals("VList")) {
        this_node.setAttribute("type", "vertical");
        } else {
        this_node.setAttribute("type", "horzizontal");
        }
        String title = info.getInfo("Title");
        Element meta_list = doc_.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
        GSXML.addMetadata(doc_, meta_list, "Title", title);
        this_node.appendChild(meta_list);

        System.out.println("classifier_name="+classifier_name);
        System.out.println("this name="+elem_name);
        // the parents
        String middle_name = OID.getParent(elem_name);
        Element middle_node = this_node;
        while (!middle_name.equals(classifier_name)) {
        System.out.println("middle_name="+middle_name);
        // add in a new node
        Element temp_node = doc_.createElement("node");
        temp_node.setAttribute("name", middle_name);
        
        DBInfo i = gdbm_src_.getInfo(middle_name);
        type = i.getInfo("childtype");
        if (type.equals("VList")) {
            temp_node.setAttribute("type", "vertical");
        } else {
            temp_node.setAttribute("type", "horzizontal");
        }
        title = i.getInfo("Title");
        meta_list = doc_.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
        GSXML.addMetadata(doc_, meta_list, "Title", title);
        temp_node.appendChild(meta_list);

        // link into the tree
        temp_node.appendChild(middle_node);
        middle_node = temp_node;
        middle_name = OID.getParent(middle_name);
        }
        classifier.appendChild(middle_node);
    }
    // get the child nodes
    String contains = info.getInfo("contains");
    // replace the " with parent name
    contains = OID.translateParent(contains, elem_name);
    String [] children = contains.split(";");
    for (int i=0; i<children.length; i++) {
        String child = children[i];
        DBInfo child_info = gdbm_src_.getInfo(child);
        String title = child_info.getInfo("Title");
        Element node;
        if (child.startsWith("HASH")) {
        // a resource
        node = doc_.createElement(GSXML.RESOURCE_ELEM);
        } else { // a node in the classification
        node = doc_.createElement("node");
        
        }
        
        node.setAttribute(GSXML.NAME_ATT, child);
        Element meta_list = doc_.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
        GSXML.addMetadata(doc_, meta_list, "Title", title);
        node.appendChild(meta_list);
        this_node.appendChild(node);
        
    }
    
    return result;
    
    }
    

    /** configure this service */
    public boolean configure(Element info) {

    System.out.println("configuring GSDL2ClassifierServices");

    Element e = null;
    // these entries should reflect the build config file - some services may not be available depending on how the colleciton was built.
    // set up short_service_info_ - for now just has name and type
    e = doc_.createElement(GSXML.SERVICE_ELEM);
    e.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_QUERY);
    e.setAttribute(GSXML.NAME_ATT, CLASSIFIER_SERVICE);
    short_service_info_.appendChild(e);

    // set up service_info_map_ - for now, just has the same elements as above
    // should have full details about each service incl params lists etc.
    e = doc_.createElement(GSXML.SERVICE_ELEM);
    e.setAttribute(GSXML.TYPE_ATT, GSXML.SERVICE_TYPE_QUERY);
    e.setAttribute(GSXML.NAME_ATT, CLASSIFIER_SERVICE);

    // get the classifier list out of the service info
    Node classList = GSXML.getChildByTagName(info, GSXML.CLASSIFIER_ELEM+GSXML.LIST_MODIFIER);
    e.appendChild(doc_.importNode(classList, true));

    service_info_map_.put(CLASSIFIER_SERVICE, e);
    
    if (gdbm_src_.openDatabase(GSFile.GDBMDatabaseFile(site_home_, cluster_name_), GDBMWrapper.READER)) {
        return true;
    }
    else {
        System.err.println("couldn't open gdbm database!");
        return false;
    }
    
    }


}