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ExecutionEngine.scala
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ExecutionEngine.scala
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/**
* Copyright (c) 2002-2012 "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.cypher
import internal.commands._
import internal.executionplan.ExecutionPlanImpl
import internal.LRUCache
import scala.collection.JavaConverters._
import java.lang.Error
import java.util.{Map => JavaMap}
import scala.deprecated
import org.neo4j.kernel.InternalAbstractGraphDatabase
import org.neo4j.graphdb.GraphDatabaseService
class ExecutionEngine(graph: GraphDatabaseService) {
checkScalaVersion()
require(graph != null, "Can't work with a null graph database")
val parser = createCorrectParser()
private def createCorrectParser() = if (graph.isInstanceOf[InternalAbstractGraphDatabase]) {
val database = graph.asInstanceOf[InternalAbstractGraphDatabase]
database.getConfig.getParams.asScala.get("cypher_parser_version") match {
case None => new CypherParser()
case Some(v) => new CypherParser(v)
}
}
else {
new CypherParser()
}
@throws(classOf[SyntaxException])
def execute(query: String): ExecutionResult = execute(query, Map[String, Any]())
@throws(classOf[SyntaxException])
def execute(query: String, params: Map[String, Any]): ExecutionResult = prepare(query).execute(params)
@throws(classOf[SyntaxException])
def execute(query: String, params: JavaMap[String, Any]): ExecutionResult = execute(query, params.asScala.toMap)
@throws(classOf[SyntaxException])
def prepare(query: String): ExecutionPlan = executionPlanCache.getOrElseUpdate(query, new ExecutionPlanImpl(parser.parse(query), graph))
@throws(classOf[SyntaxException])
@deprecated(message = "You should not parse queries manually any more. Use the execute(String) instead")
def execute(query: Query): ExecutionResult = execute(query, Map[String, Any]())
@throws(classOf[SyntaxException])
@deprecated(message = "You should not parse queries manually any more. Use the execute(String) instead")
def execute(query: Query, map: JavaMap[String, Any]): ExecutionResult = execute(query, map.asScala.toMap)
@throws(classOf[SyntaxException])
@deprecated(message = "You should not parse queries manually any more. Use the execute(String) instead")
def execute(query: Query, params: Map[String, Any]): ExecutionResult = new ExecutionPlanImpl(query, graph).execute(params)
private def checkScalaVersion() {
if (util.Properties.versionString.matches("^version 2.9.0")) {
throw new Error("Cypher can only run with Scala 2.9.0. It looks like the Scala version is: " +
util.Properties.versionString)
}
}
private val cacheSize: Int = 100
private val executionPlanCache = new LRUCache[String, ExecutionPlan](cacheSize) {}
}