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/**
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* Copyright: 2013 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.common.query;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.MalformedURLException;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import javax.xml.parsers.ParserConfigurationException;
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import org.apache.solr.client.solrj.SolrServer;
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import org.apache.solr.client.solrj.SolrServerException;
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import org.apache.solr.client.solrj.embedded.EmbeddedSolrServer;
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import org.apache.solr.client.solrj.impl.CommonsHttpSolrServer;
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import org.apache.solr.client.solrj.response.QueryResponse;
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import org.apache.solr.common.params.SolrParams;
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import org.apache.solr.core.CoreContainer;
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import org.apache.solr.schema.IndexSchema;
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import org.apache.solr.schema.SchemaField;
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import org.dataone.service.exceptions.NotFound;
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import org.dataone.service.exceptions.NotImplemented;
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import org.dataone.service.exceptions.UnsupportedType;
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import org.dataone.service.types.v1.Identifier;
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import org.dataone.service.types.v1.Subject;
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import org.xml.sax.SAXException;
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import edu.ucsb.nceas.metacat.common.SolrServerFactory;
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/**
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* A class to handle the solr query. It will call the SolrServerFactory to generate a SolrServer and
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* determine the type - the embedded or http solr server.
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* @author tao
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*
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*/
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public class SolrQueryServiceController {
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private static SolrQueryServiceController controller = null;
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private boolean isEmbeddedSolrServer = false;
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private EmbeddedSolrQueryService embeddedQueryService = null;
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private HttpSolrQueryService httpQueryService = null;
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/*
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* Private consctructor
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*/
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private SolrQueryServiceController() throws UnsupportedType, ParserConfigurationException, IOException, SAXException, NotFound {
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SolrServer solrServer = SolrServerFactory.createSolrServer();
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if(solrServer instanceof EmbeddedSolrServer) {
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isEmbeddedSolrServer = true;
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EmbeddedSolrServer embeddedServer = (EmbeddedSolrServer) solrServer;
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CoreContainer coreContainer = SolrServerFactory.getCoreContainer();
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String collectionName = SolrServerFactory.getCollectionName();
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embeddedQueryService = new EmbeddedSolrQueryService(embeddedServer, coreContainer, collectionName);
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} else {
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isEmbeddedSolrServer = false;
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CommonsHttpSolrServer httpServer = (CommonsHttpSolrServer)solrServer;
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httpQueryService = new HttpSolrQueryService(httpServer);
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}
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}
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/**
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* Get the controller
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* @return
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* @throws UnsupportedType
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* @throws NotFound
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* @throws ParserConfigurationException
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* @throws IOException
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* @throws SAXException
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*/
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public static SolrQueryServiceController getInstance() throws UnsupportedType, NotFound, ParserConfigurationException, IOException, SAXException {
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if(controller == null) {
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controller = new SolrQueryServiceController();
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}
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return controller;
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}
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/**
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* Query the Solr server with specified query string or SolrParams and the user's identity.
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* @param query query string. It is for the HttpSolrQueryService.
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* @param params the SolrParam. It is for the EmbeddedSolrQueryService.
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* @param subjects
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* @return
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* @throws NotImplemented
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* @throws NotFound
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* @throws IOException
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* @throws SolrServerException
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* @throws SAXException
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* @throws ParserConfigurationException
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* @throws UnsupportedType
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*/
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public InputStream query(SolrParams params,Set<Subject>subjects) throws NotImplemented, NotFound, IOException, UnsupportedType, ParserConfigurationException, SAXException, SolrServerException {
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if(isEmbeddedSolrServer) {
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return embeddedQueryService.query(params, subjects);
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} else {
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return httpQueryService.query(params, subjects);
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}
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}
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/**
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* Get the spec version of the solr server
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* @return
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*/
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public String getSolrSpecVersion() {
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if(isEmbeddedSolrServer) {
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return embeddedQueryService.getSolrServerVersion();
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} else {
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return httpQueryService.getSolrServerVersion();
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}
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}
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/**
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* Get the fields list of the index schema
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* @return
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* @throws SAXException
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* @throws IOException
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* @throws ParserConfigurationException
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* @throws MalformedURLException
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* @throws Exception
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*/
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public Map<String, SchemaField> getIndexSchemaFields() throws MalformedURLException, ParserConfigurationException, IOException, SAXException {
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if(isEmbeddedSolrServer) {
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return embeddedQueryService.getIndexSchemaFields();
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} else {
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return httpQueryService.getIndexSchemaFields();
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}
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}
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/**
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* Access the SOLR index schema
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* @return
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* @throws SAXException
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* @throws IOException
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* @throws ParserConfigurationException
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* @throws MalformedURLException
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*/
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public IndexSchema getSchema() throws MalformedURLException, ParserConfigurationException, IOException, SAXException {
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if(isEmbeddedSolrServer) {
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return embeddedQueryService.getSchema();
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} else{
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return httpQueryService.getSchema();
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}
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}
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/**
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* If the solr client was configured as an embedded solr server.
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* @return true if it is; false otherwise.
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*/
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public boolean isEmbeddedSolrServer() {
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return isEmbeddedSolrServer;
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}
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/**
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* If the solr server has at least one solr doc for the given id.
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* @param id
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* @return true if the server has at lease one solr doc; false otherwise.
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*/
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public boolean hasSolrDoc(Identifier id) throws ParserConfigurationException, SolrServerException, IOException, SAXException{
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if(isEmbeddedSolrServer) {
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return embeddedQueryService.hasSolrDoc(id);
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} else{
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return httpQueryService.hasSolrDoc(id);
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}
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}
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}
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