source: gs3-extensions/solr/trunk/src/src/java/org/greenstone/gsdl3/service/SolrSearch.java@ 25808

package org.greenstone.gsdl3.service;


// Based on LuceneSearch, but not thoroughly tested

// Greenstone classes
import org.greenstone.gsdl3.util.*;
import org.greenstone.util.GlobalProperties;

// XML classes
import org.w3c.dom.Element; 
import org.w3c.dom.Document;
import org.w3c.dom.NodeList; 

import java.util.HashMap;
import java.util.ArrayList;


import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.embedded.EmbeddedSolrServer;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.params.ModifiableSolrParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.servlet.SolrRequestParsers;
import org.apache.solr.core.CoreContainer;

import java.io.File;
import java.util.Collection;


import org.apache.log4j.*;


public class SolrSearch extends LuceneSearch {

    static Logger logger = Logger.getLogger(org.greenstone.gsdl3.service.SolrSearch.class.getName());

    static protected CoreContainer solr_cores = null;
    protected HashMap solr_server;

    public SolrSearch()
    {
    solr_server = new HashMap();

    if (solr_cores == null) {
        // Share one CoreContainer across all sites/collections
        try { 
        
        String gsdl3_home = GlobalProperties.getGSDL3Home();
        String solr_ext_name = GlobalProperties.getProperty("gsdlext.solr.dirname","solr");
        
        String solr_home_str = GSFile.extHome(gsdl3_home,solr_ext_name);
        File solr_home = new File(solr_home_str);
        File solr_xml = new File( solr_home,"solr.xml" );

        solr_cores = new CoreContainer(solr_home_str,solr_xml);             
        }
        catch (Exception e) {
        e.printStackTrace();
        }
    }
    }

    // Overriding the cleanUp() method here, so as to parallel the structure of GS2SolrSearch 
    // which also calls shutdown() on its CoreContainer object in GS2SolrSearch.cleanUp().
    // However, this class has not yet been tested, so it's not certain that this method is 
    // required here.
    public void cleanUp() {
    super.cleanUp();
    solr_cores.shutdown();
    }

    public boolean configure(Element info, Element extra_info) {
    if (!super.configure(info, extra_info)){
        return false;
    }

    // initialize required number of SolrCores based on values
    // in 'index_ids' that are set by LuceneSearch::configure()

    String site_name = this.router.getSiteName();
    String coll_name = this.cluster_name;

    for (int i=0; i<index_ids.size(); i++) {

        String idx_name = (String)index_ids.get(i);
        String core_name = site_name + "-" + coll_name + "-" + idx_name;

        EmbeddedSolrServer solr_core
        = new EmbeddedSolrServer(solr_cores,core_name); 

        solr_server.put(core_name,solr_core);
    }

    return true;
    }
    
    protected void getIndexData(ArrayList index_ids, ArrayList index_names, String lang) 
    {
    }

    /** Process a text query - implemented by concrete subclasses */
    protected Element processTextQuery(Element request) {

    Element result = this.doc.createElement(GSXML.RESPONSE_ELEM);
    Element doc_node_list = this.doc.createElement(GSXML.DOC_NODE_ELEM+GSXML.LIST_MODIFIER);
    Element metadata_list = this.doc.createElement(GSXML.METADATA_ELEM+GSXML.LIST_MODIFIER);
    initResultElement(result,doc_node_list,metadata_list);

    if (!hasParamList(request,metadata_list)) {
        return result;
    }

    Element param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
    if (!hasQueryString(param_list,metadata_list)) {
        return result;
    }

    HashMap params = GSXML.extractParams(param_list, false);
    String query_string = (String) params.get(QUERY_PARAM);


    // Get the index
    String index = (String) params.get(INDEX_PARAM);
    if (index == null || index.equals("")) {
        index = this.default_index; // assume the default
    }

        try {

        ModifiableSolrParams solrParams = new ModifiableSolrParams();
        solrParams.set("q", query_string);
        //solrParams.set("start", start);
        //solrParams.set("rows", nbDocuments);

        String site_name = this.router.getSiteName();
        String coll_name = this.cluster_name;

        String core_name = site_name + "-" + coll_name + "-" + index;

        EmbeddedSolrServer solr_core = (EmbeddedSolrServer)solr_server.get(core_name);

        QueryResponse solrResponse = solr_core.query(solrParams);

        SolrDocumentList hits = solrResponse.getResults();

        if (hits != null) {
        // or should this be docs.getNumFound() ??
        GSXML.addMetadata(this.doc, metadata_list, "numDocsMatched", ""+hits.size());

        System.err.println(hits.getNumFound() + " documents found, "
                   + hits.size() + " returned : ");

        for (int i = 0; i < hits.size(); i++) {
            SolrDocument solr_doc = hits.get(i);

            String node_id = (String)solr_doc.get("docOID");
            Element node = this.doc.createElement(GSXML.DOC_NODE_ELEM);
            node.setAttribute(GSXML.NODE_ID_ATT, node_id);
            doc_node_list.appendChild(node);

            System.out.println("\t" + solr_doc.toString());
        }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    
    return result;
        
    }

    
}