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Statement.java
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Statement.java
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/*
* Copyright (c) 2002-2016 "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 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 <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.api;
import org.neo4j.graphdb.Resource;
import org.neo4j.kernel.api.exceptions.InvalidTransactionTypeKernelException;
/**
* A statement which is a smaller coherent unit of work inside a {@link KernelTransaction}.
* There are accessors for different types of operations. The operations are divided into
* read and write operations, write operations are divided into {@link #dataWriteOperations()} and
* {@link #schemaWriteOperations()} since there can be only one type of write operations inside
* any given transaction. In both cases {@link #tokenWriteOperations()} are allowed though,
* which is why it can be accessed separately. The transaction, if still "undecided" about its
* type of write operations, will be decided when calling either {@link #dataWriteOperations()}
* or {@link #schemaWriteOperations()}, otherwise if already decided, verified so that it's
* of the same type.
*/
public interface Statement extends Resource
{
/**
* @return interface exposing all read operations.
*/
ReadOperations readOperations();
/**
* @return interface exposing all write operations about tokens.
*/
TokenWriteOperations tokenWriteOperations();
/**
* @return interface exposing all write operations about data such as nodes, relationships and properties.
* @throws InvalidTransactionTypeKernelException if type of this transaction have already been decided
* and it's of a different type, e.g {@link #schemaWriteOperations()}.
*/
DataWriteOperations dataWriteOperations() throws InvalidTransactionTypeKernelException;
/**
* @return interface exposing all write operations about schema such as indexes and constraints.
* @throws InvalidTransactionTypeKernelException if type of this transaction have already been decided
* and it's of a different type, e.g {@link #dataWriteOperations()}.
*/
SchemaWriteOperations schemaWriteOperations() throws InvalidTransactionTypeKernelException;
/**
* @return interface exposing operations for associating metadata with this statement
*/
QueryRegistryOperations queryRegistration();
}