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KeysFunction.scala
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KeysFunction.scala
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/*
* Copyright (c) 2002-2017 "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.compatibility.v3_3.runtime.commands.expressions
import org.neo4j.cypher.internal.compatibility.v3_3.runtime.ExecutionContext
import org.neo4j.cypher.internal.compatibility.v3_3.runtime.helpers.IsMap
import org.neo4j.cypher.internal.compatibility.v3_3.runtime.pipes.QueryState
import org.neo4j.cypher.internal.frontend.v3_3.CypherTypeException
import org.neo4j.values.AnyValue
case class KeysFunction(expr: Expression) extends NullInNullOutExpression(expr) {
override def compute(value: AnyValue, ctx: ExecutionContext)(implicit state: QueryState) = value match {
case IsMap(map) =>
map.keys
case x =>
throw new CypherTypeException(s"Expected $expr to be a node, a relationship, or a literal map, but it was ${x.getClass.getSimpleName}")
}
def rewrite(f: (Expression) => Expression) = f(KeysFunction(expr.rewrite(f)))
def arguments = Seq(expr)
def symbolTableDependencies = expr.symbolTableDependencies
}