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PointFunction.scala
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PointFunction.scala
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/*
* Copyright (c) 2002-2018 "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.runtime.interpreted.commands.expressions
import java.util.function.BiConsumer
import org.neo4j.cypher.internal.util.v3_4.CypherTypeException
import org.neo4j.kernel.impl.util.ValueUtils
import org.neo4j.cypher.internal.runtime.interpreted.ExecutionContext
import org.neo4j.cypher.internal.runtime.interpreted.IsMap
import org.neo4j.cypher.internal.runtime.interpreted.pipes.QueryState
import org.neo4j.values.AnyValue
import org.neo4j.values.storable.Values
import org.neo4j.values.virtual.MapValue
case class PointFunction(data: Expression) extends NullInNullOutExpression(data) {
override def compute(value: AnyValue, ctx: ExecutionContext, state: QueryState): AnyValue = value match {
case IsMap(mapCreator) =>
val map = mapCreator(state.query)
if (containsNull(map)) Values.NO_VALUE
else ValueUtils.pointFromMap(map)
case x => throw new CypherTypeException(s"Expected a map but got $x")
}
private def containsNull(map: MapValue) = {
var hasNull = false
map.foreach(new BiConsumer[String, AnyValue] {
override def accept(t: String, u: AnyValue): Unit = if (u == Values.NO_VALUE) hasNull = true
})
hasNull
}
override def rewrite(f: (Expression) => Expression) = f(PointFunction(data.rewrite(f)))
override def arguments = data.arguments
override def symbolTableDependencies = data.symbolTableDependencies
override def toString = "Point(" + data + ")"
}