001/*
002 * Copyright (c) 2018-2019 Chris K Wensel <chris@wensel.net>. All Rights Reserved.
003 *
004 * Project and contact information: http://www.cascading.org/
005 *
006 * This file is part of the Cascading project.
007 *
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020
021package cascading.local.tap.neo4j;
022
023import java.util.Map;
024
025import iot.jcypher.database.util.QParamsUtil;
026import iot.jcypher.query.JcQuery;
027import iot.jcypher.query.writer.CypherWriter;
028import iot.jcypher.query.writer.Format;
029import iot.jcypher.query.writer.QueryParam;
030import iot.jcypher.query.writer.WriterContext;
031import iot.jcypher.util.Util;
032import org.neo4j.driver.v1.StatementResult;
033import org.neo4j.driver.v1.Transaction;
034import org.slf4j.Logger;
035import org.slf4j.LoggerFactory;
036
037/**
038 *
039 */
040public abstract class Neo4jStatement<T>
041  {
042  private static final Logger LOG = LoggerFactory.getLogger( Neo4jStatement.class );
043
044  public abstract JcQuery getStatement( T node );
045
046  public StatementResult runStatement( Transaction tx, T node )
047    {
048    JcQuery query = getStatement( node );
049
050    if( LOG.isDebugEnabled() )
051      LOG.debug( "cypher: {}", Util.toCypher( query, Format.NONE ) );
052
053    WriterContext context = new WriterContext();
054    QueryParam.setExtractParams( query.isExtractParams(), context );
055    CypherWriter.toCypherExpression( query, context );
056
057    String cypher = context.buffer.toString();
058    Map<String, Object> paramsMap = QParamsUtil.createQueryParams( context );
059
060    return tx.run( cypher, paramsMap );
061    }
062  }