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/**
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* '$RCSfile$'
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* Copyright: 2000-2011 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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* '$Author: leinfelder $'
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* '$Date: 2012-11-29 16:52:29 -0800 (Thu, 29 Nov 2012) $'
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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.index;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStreamWriter;
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import java.io.Writer;
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import java.sql.SQLException;
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import java.util.Hashtable;
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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.commons.io.IOUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.solr.client.solrj.SolrServerException;
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import org.apache.solr.common.params.ModifiableSolrParams;
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import org.apache.solr.common.params.SolrParams;
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import org.apache.solr.servlet.SolrRequestParsers;
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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.dataone.service.types.v1.SystemMetadata;
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import org.xml.sax.SAXException;
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import edu.ucsb.nceas.metacat.DBTransform;
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import edu.ucsb.nceas.metacat.common.index.IndexTask;
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import edu.ucsb.nceas.metacat.common.query.SolrQueryResponseWriterFactory;
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import edu.ucsb.nceas.metacat.common.query.SolrQueryService;
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import edu.ucsb.nceas.metacat.common.query.SolrQueryServiceController;
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import edu.ucsb.nceas.metacat.common.query.stream.ContentTypeByteArrayInputStream;
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import edu.ucsb.nceas.metacat.dataone.hazelcast.HazelcastService;
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import edu.ucsb.nceas.utilities.PropertyNotFoundException;
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/**
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* This class will query the solr server and return the result.
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* @author tao
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*
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*/
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public class MetacatSolrIndex {
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//public static final String SOLRQUERY = "solr";
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//public static final String SOLR_HOME_PROPERTY_NAME = "solr.homeDir";
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//public static final String SOLR_CONFIG_FILE_NAME_PROPERTY_NAME = "solr.configFileName";
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//public static final String SOLR_COLLECTION_NAME_PROPERTY_NAME = "solr.collectionName";
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//public static final String SOLR_SERVER_CLASSNAME_PROPERTY_NAME = "solr.server.classname";
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private static Log log = LogFactory.getLog(MetacatSolrIndex.class);
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private static MetacatSolrIndex solrIndex = null;
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public static MetacatSolrIndex getInstance() throws Exception {
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if (solrIndex == null) {
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solrIndex = new MetacatSolrIndex();
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}
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return solrIndex;
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}
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/**
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* Constructor
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* @throws SAXException
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* @throws IOException
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* @throws ParserConfigurationException
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*/
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private MetacatSolrIndex() throws Exception {
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}
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/**
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* Query the solr server
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* @param query the solr query
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* @param authorizedSubjects the authorized subjects in this query session
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* @return the result as the InputStream
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* @throws SolrServerException
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* @throws ClassNotFoundException
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* @throws SQLException
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* @throws PropertyNotFoundException
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* @throws SAXException
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* @throws ParserConfigurationException
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* @throws UnsupportedType
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* @throws NotFound
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* @throws NotImplemented
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*/
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public InputStream query(String query, Set<Subject>authorizedSubjects) throws SolrServerException, IOException, PropertyNotFoundException, SQLException,
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ClassNotFoundException, ParserConfigurationException, SAXException, NotImplemented, NotFound, UnsupportedType {
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if(authorizedSubjects == null || authorizedSubjects.isEmpty()) {
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throw new SolrServerException("MetacatSolrIndex.query - There is no any authorized subjects(even the public user) in this query session.");
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}
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InputStream inputStream = null;
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SolrParams solrParams = SolrRequestParsers.parseQueryString(query);
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String wt = solrParams.get(SolrQueryService.WT);
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// handle normal and skin-based queries
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if (SolrQueryService.isSupportedWT(wt)) {
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// just handle as normal solr query
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inputStream = SolrQueryServiceController.getInstance().query(solrParams, authorizedSubjects);
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}
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else {
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// assume it is a skin name
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String qformat = wt;
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// perform the solr query using wt=XML
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wt = SolrQueryResponseWriterFactory.XML;
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ModifiableSolrParams msp = new ModifiableSolrParams(solrParams);
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msp.set(SolrQueryService.WT, wt);
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inputStream = SolrQueryServiceController.getInstance().query(msp, authorizedSubjects);
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// apply the stylesheet (XML->HTML)
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DBTransform transformer = new DBTransform();
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String documentContent = IOUtils.toString(inputStream, "UTF-8");
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String sourceType = "solr";
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String targetType = "-//W3C//HTML//EN";
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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Writer writer = new OutputStreamWriter(baos , "UTF-8");
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// TODO: include more params?
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Hashtable<String, String[]> params = new Hashtable<String, String[]>();
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params.put("qformat", new String[] {qformat});
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transformer.transformXMLDocument(
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documentContent ,
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sourceType,
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targetType ,
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qformat,
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writer,
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params,
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null //sessionid
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);
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// finally, get the HTML back
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inputStream = new ContentTypeByteArrayInputStream(baos.toByteArray());
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((ContentTypeByteArrayInputStream) inputStream).setContentType("text/html");
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}
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return inputStream;
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}
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public void submit(Identifier pid, SystemMetadata systemMetadata, Map<String, List<Object>> fields) {
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IndexTask task = new IndexTask();
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task.setSystemMetadata(systemMetadata);
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task.setFields(fields);
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HazelcastService.getInstance().getIndexQueue().put(pid, task );
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}
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}
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