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BinaryOperator.scala
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BinaryOperator.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_1.codegen.ir.expressions
import org.neo4j.cypher.internal.compiler.v3_1.codegen.{CodeGenContext, MethodStructure}
import org.neo4j.cypher.internal.frontend.v3_1.symbols._
trait BinaryOperator {
self: CodeGenExpression =>
def lhs: CodeGenExpression
def rhs: CodeGenExpression
override final def init[E](generator: MethodStructure[E])(implicit context: CodeGenContext) = {
lhs.init(generator)
rhs.init(generator)
}
override final def generateExpression[E](structure: MethodStructure[E])(implicit context: CodeGenContext) =
generator(structure)(context)(lhs.generateExpression(structure), rhs.generateExpression(structure))
protected def generator[E](structure: MethodStructure[E])(implicit context: CodeGenContext): (E, E) => E
}
// Trait that resolves type based on inputs.
trait NumericalOpType {
self : CodeGenExpression =>
def lhs: CodeGenExpression
def rhs: CodeGenExpression
override def cypherType(implicit context: CodeGenContext) =
(lhs.cypherType, rhs.cypherType) match {
case (CTInteger, CTInteger) => CTInteger
case (Number(_), Number(_)) => CTFloat
// Runtime we'll figure it out - can't store it in a primitive field unless we are 100% of the type
case _ => CTAny
}
}
object Number {
def unapply(x: CypherType): Option[CypherType] = if (CTNumber.isAssignableFrom(x)) Some(x) else None
}