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BloomProcedure.java
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BloomProcedure.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.integrations.bloom;
import java.util.ArrayList;
import org.neo4j.collection.RawIterator;
import org.neo4j.collection.primitive.PrimitiveLongIterator;
import org.neo4j.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.api.impl.fulltext.FulltextProvider;
import org.neo4j.kernel.api.impl.fulltext.ReadOnlyFulltext;
import org.neo4j.kernel.api.proc.CallableProcedure;
import org.neo4j.kernel.api.proc.Context;
import org.neo4j.kernel.api.proc.Neo4jTypes;
import org.neo4j.kernel.api.proc.QualifiedName;
import static org.neo4j.kernel.api.proc.ProcedureSignature.procedureSignature;
/**
* Procedures for querying the bloom fulltext addon.
*/
public class BloomProcedure extends CallableProcedure.BasicProcedure
{
private static final String OUTPUT_NAME = "entityid";
private static final String PROCEDURE_NAME = "bloomFulltext";
private static final String[] PROCEDURE_NAMESPACE = {"db", "fulltext"};
private final String identifier;
private final FulltextProvider provider;
private FulltextProvider.FULLTEXT_INDEX_TYPE type;
/**
* Creates a procedure for querying the bloom fulltext addon.
* @param type The type of fulltext index to be queried.
* @param identifier The identifier of the fulltext index.
* @param provider The provider of the fulltext index.
*/
public BloomProcedure( FulltextProvider.FULLTEXT_INDEX_TYPE type, String identifier, FulltextProvider provider )
{
super( procedureSignature( new QualifiedName( PROCEDURE_NAMESPACE, PROCEDURE_NAME + type ) ).in( "terms",
Neo4jTypes.NTList( Neo4jTypes.NTString ) ).out( OUTPUT_NAME, Neo4jTypes.NTInteger ).description(
String.format( "Queries the bloom index for %s.", type ) ).build() );
this.type = type;
this.identifier = identifier;
this.provider = provider;
}
@Override
public RawIterator<Object[],ProcedureException> apply( Context ctx, Object[] input ) throws ProcedureException
{
String[] query = ((ArrayList<String>) input[0]).toArray( new String[0] );
try ( ReadOnlyFulltext indexReader = provider.getReader( identifier, type ) )
{
PrimitiveLongIterator primitiveLongIterator = indexReader.fuzzyQuery( query );
return new RawIterator<Object[],ProcedureException>()
{
@Override
public boolean hasNext() throws ProcedureException
{
return primitiveLongIterator.hasNext();
}
@Override
public Object[] next() throws ProcedureException
{
return new Long[]{primitiveLongIterator.next()};
}
};
}
catch ( Exception e )
{
throw new ProcedureException( Status.Procedure.ProcedureCallFailed, e, "Failed to query bloom index for " + type, input );
}
}
}