org.neo4j.cypher.internal.runtime.ast.ExpressionVariable.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.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 .
 */
package org.neo4j.cypher.internal.runtime.ast

import org.neo4j.cypher.internal.expressions.LogicalVariable
import org.neo4j.exceptions.InternalException

object ExpressionVariable {

  def cast(variable: LogicalVariable): ExpressionVariable =
    variable match {
      case ev: ExpressionVariable => ev
      case v =>
        throw new InternalException(
          s"Error during interpreted physical planning: expression variable '$v' has not been allocated"
        )
    }

  def castOpt(variable: LogicalVariable): Option[ExpressionVariable] =
    variable match {
      case ev: ExpressionVariable => Some(ev)
      case _                      => None
    }
}

case class ExpressionVariable(offset: Int, override val name: String)
    extends RuntimeVariable(name) {
  override def asCanonicalStringVal: String = name
}