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AggregationFunctionInvocation.scala
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AggregationFunctionInvocation.scala
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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.cypher.internal.compiler.v3_2.commands.expressions
import org.neo4j.cypher.internal.compiler.v3_2.ExecutionContext
import org.neo4j.cypher.internal.compiler.v3_2.helpers.{RuntimeJavaValueConverter, RuntimeScalaValueConverter}
import org.neo4j.cypher.internal.compiler.v3_2.pipes.QueryState
import org.neo4j.cypher.internal.compiler.v3_2.pipes.aggregation.AggregationFunction
import org.neo4j.cypher.internal.compiler.v3_2.spi.UserFunctionSignature
case class AggregationFunctionInvocation(signature: UserFunctionSignature, arguments: IndexedSeq[Expression])
extends AggregationExpression {
override def createAggregationFunction: AggregationFunction = new AggregationFunction {
private var inner: UserDefinedAggregator = null
override def result(implicit state:QueryState) = {
val isGraphKernelResultValue = state.query.isGraphKernelResultValue _
val scalaValues = new RuntimeScalaValueConverter(isGraphKernelResultValue, state.typeConverter.asPrivateType)
scalaValues.asDeepScalaValue(aggregator.result)
}
override def apply(data: ExecutionContext)
(implicit state: QueryState) = {
val converter = new RuntimeJavaValueConverter(state.query.isGraphKernelResultValue, state.typeConverter.asPublicType)
val argValues = arguments.map(arg => converter.asDeepJavaValue(arg(data)(state)))
aggregator.update(argValues)
}
private def aggregator(implicit state: QueryState) = {
if (inner == null) {
inner = state.query.aggregateFunction(signature.name, signature.allowed)
}
inner
}
}
override def rewrite(f: (Expression) => Expression): Expression = f(
AggregationFunctionInvocation(signature, arguments.map(a => a.rewrite(f))))
override def symbolTableDependencies: Set[String] = arguments.flatMap(_.symbolTableDependencies).toSet
}