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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.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 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.kernel.impl.query;

import java.util.function.Supplier;

import org.neo4j.kernel.GraphDatabaseQueryService;
import org.neo4j.kernel.api.query.ExecutingQuery;
import org.neo4j.kernel.impl.api.KernelStatement;
import org.neo4j.kernel.impl.coreapi.InternalTransaction;
import org.neo4j.kernel.impl.factory.KernelTransactionFactory;
import org.neo4j.values.virtual.MapValue;

import static org.neo4j.function.Suppliers.lazySingleton;

public class Neo4jTransactionalContextFactory implements TransactionalContextFactory
{
    private final Neo4jTransactionalContext.Creator contextCreator;

    public static TransactionalContextFactory create( Supplier queryServiceSupplier,
            KernelTransactionFactory transactionFactory )
    {
        Supplier queryService = lazySingleton( queryServiceSupplier );
        Neo4jTransactionalContext.Creator contextCreator =
                ( tx, initialStatement, executingQuery ) -> new Neo4jTransactionalContext(
                        queryService.get(),
                        tx,
                        initialStatement,
                        executingQuery,
                        transactionFactory );
        return new Neo4jTransactionalContextFactory( contextCreator );
    }

    @Deprecated
    public static TransactionalContextFactory create( GraphDatabaseQueryService queryService )
    {
        var resolver = queryService.getDependencyResolver();
        var transactionFactory = resolver.resolveDependency( KernelTransactionFactory.class );
        Neo4jTransactionalContext.Creator contextCreator =
                ( tx, initialStatement, executingQuery ) ->
                        new Neo4jTransactionalContext(
                                queryService,
                                tx,
                                initialStatement,
                                executingQuery,
                                transactionFactory
                        );
        return new Neo4jTransactionalContextFactory( contextCreator );
    }

    // Please use the factory methods above to actually construct an instance
    private Neo4jTransactionalContextFactory( Neo4jTransactionalContext.Creator contextCreator )
    {
        this.contextCreator = contextCreator;
    }

    @Override
    public final Neo4jTransactionalContext newContext( InternalTransaction tx, String queryText, MapValue queryParameters )
    {
        KernelStatement initialStatement = (KernelStatement) tx.kernelTransaction().acquireStatement();
        var executingQuery = initialStatement.queryRegistry().startAndBindExecutingQuery( queryText, queryParameters );
        return contextCreator.create( tx, initialStatement, executingQuery );
    }

    @Override
    public TransactionalContext newContextForQuery( InternalTransaction tx, ExecutingQuery executingQuery )
    {
        KernelStatement initialStatement = (KernelStatement) tx.kernelTransaction().acquireStatement();
        initialStatement.queryRegistry().bindExecutingQuery( executingQuery );
        return contextCreator.create( tx, initialStatement, executingQuery );
    }
}