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SimpleFulltextReader.java
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SimpleFulltextReader.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.api.impl.fulltext;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.queryparser.classic.MultiFieldQueryParser;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import java.io.IOException;
import org.neo4j.collection.primitive.PrimitiveLongCollections;
import org.neo4j.collection.primitive.PrimitiveLongIterator;
import org.neo4j.kernel.api.impl.index.collector.DocValuesCollector;
import org.neo4j.kernel.api.impl.index.partition.PartitionSearcher;
import org.neo4j.kernel.api.impl.schema.reader.IndexReaderCloseException;
import static java.util.Arrays.stream;
import static java.util.stream.Collectors.joining;
import static org.neo4j.kernel.api.impl.fulltext.FulltextProvider.FIELD_ENTITY_ID;
/**
* Lucene index reader that is able to read/sample a single partition of a partitioned Lucene index.
*
* @see PartitionedFulltextReader
*/
class SimpleFulltextReader implements ReadOnlyFulltext
{
private final PartitionSearcher partitionSearcher;
private final Analyzer analyzer;
private final String[] properties;
SimpleFulltextReader( PartitionSearcher partitionSearcher, String[] properties, Analyzer analyzer )
{
this.partitionSearcher = partitionSearcher;
this.properties = properties;
this.analyzer = analyzer;
}
@Override
public PrimitiveLongIterator query( boolean matchAll, String... terms )
{
String query = stream( terms ).map( QueryParser::escape ).collect( joining( " " ) );
return innerQuery( query, matchAll );
}
@Override
public PrimitiveLongIterator fuzzyQuery( boolean matchAll, String... terms )
{
String query = stream( terms ).map( QueryParser::escape ).collect( joining( "~ ", "", "~" ) );
return innerQuery( query, matchAll );
}
@Override
public void close()
{
try
{
partitionSearcher.close();
}
catch ( IOException e )
{
throw new IndexReaderCloseException( e );
}
}
@Override
public FulltextIndexConfiguration getConfigurationDocument() throws IOException
{
IndexSearcher indexSearcher = getIndexSearcher();
TopDocs docs = indexSearcher.search( new TermQuery( FulltextIndexConfiguration.TERM ), 1 );
if ( docs.scoreDocs.length < 1 )
{
return null;
}
return new FulltextIndexConfiguration( indexSearcher.doc( docs.scoreDocs[0].doc ) );
}
private PrimitiveLongIterator innerQuery( String queryString, boolean matchAll )
{
MultiFieldQueryParser multiFieldQueryParser = new MultiFieldQueryParser( properties, analyzer );
if ( matchAll )
{
multiFieldQueryParser.setDefaultOperator( QueryParser.Operator.AND );
}
else
{
multiFieldQueryParser.setDefaultOperator( QueryParser.Operator.OR );
}
Query query;
try
{
query = multiFieldQueryParser.parse( queryString );
}
catch ( ParseException e )
{
assert false;
return PrimitiveLongCollections.emptyIterator();
}
return indexQuery( query );
}
private PrimitiveLongIterator indexQuery( Query query )
{
try
{
DocValuesCollector docValuesCollector = new DocValuesCollector( true );
getIndexSearcher().search( query, docValuesCollector );
return docValuesCollector.getSortedValuesIterator( FIELD_ENTITY_ID, Sort.RELEVANCE );
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
}
private IndexSearcher getIndexSearcher()
{
return partitionSearcher.getIndexSearcher();
}
}