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• LogicalFunctions.scala

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com.crobox.clickhouse.dsl.column.LogicalFunctions.scala Maven / Gradle / Ivy

package com.crobox.clickhouse.dsl.column

import com.crobox.clickhouse.dsl._

trait LogicalFunctions { this: Magnets =>

  sealed trait LogicalOperator
  case object And extends LogicalOperator
  case object Or  extends LogicalOperator
  case object Xor extends LogicalOperator
  case object Not extends LogicalOperator

  case class LogicalFunction(left: LogicalOpsMagnet, operator: LogicalOperator, right: LogicalOpsMagnet)
      extends ExpressionColumn[Boolean](EmptyColumn)

  trait LogicalOps { this: LogicalOpsMagnet =>
    def and(other: LogicalOpsMagnet): ExpressionColumn[Boolean] = _and(this, other)
    def or(other: LogicalOpsMagnet): ExpressionColumn[Boolean]  = _or(this, other)
    def xor(other: LogicalOpsMagnet): ExpressionColumn[Boolean] = _xor(this, other)
    def not(other: LogicalOpsMagnet): ExpressionColumn[Boolean] = _not(other)

    def op(operator: LogicalOperator, other: LogicalOpsMagnet): ExpressionColumn[Boolean] =
      operator match {
        case And => and(other)
        case Or  => or(other)
        case Xor => xor(other)
        case Not => not(other)
      }
  }

  //Reference with another name to allow to use it in the trait
  private def _and = and _
  private def _or  = or _
  private def _xor = xor _
  private def _not = not _

  def and(left: LogicalOpsMagnet, right: LogicalOpsMagnet): ExpressionColumn[Boolean] =
    (left.asOption, right.asOption) match {
      case (None, None)                           => Const(true)
      case (Some(Const(false)), _)                => Const(false)
      case (_, Some(Const(false)))                => Const(false)
      case (Some(Const(true)), Some(Const(true))) => Const(true)
      case (_, _)                                 => LogicalFunction(left, And, right)
    }

  def or(left: LogicalOpsMagnet, right: LogicalOpsMagnet): ExpressionColumn[Boolean] =
    (left.asOption, right.asOption) match {
      case (None, None)                             => Const(true)
      case (Some(Const(true)), _)                   => Const(true)
      case (_, Some(Const(true)))                   => Const(true)
      case (Some(Const(false)), Some(Const(false))) => Const(false)
      case (_, _)                                   => LogicalFunction(left, Or, right)
    }

  def xor(left: LogicalOpsMagnet, right: LogicalOpsMagnet): ExpressionColumn[Boolean] =
    (left.asOption, right.asOption) match {
      case (None, None)                            => Const(true)
      case (Some(Const(false)), Some(Const(true))) => Const(true)
      case (Some(Const(true)), Some(Const(false))) => Const(true)
      case (Some(Const(true)), Some(Const(true)))  => Const(false)
      case (_, _)                                  => LogicalFunction(left, Xor, right)
    }

  def not(col: LogicalOpsMagnet): ExpressionColumn[Boolean] =
    col.asOption match {
      case Some(Const(true))  => Const(false)
      case Some(Const(false)) => Const(true)
      case _                  => LogicalFunction(col, Not, col) //Needs both right and left for the tokenizer
    }
}