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Neo4j - Fabric

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://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.fabric.util

import org.neo4j.cypher.internal.util
import org.neo4j.cypher.internal.util.Rewritable.RewritableAny
import org.neo4j.cypher.internal.util.Rewriter

object Rewritten {

  implicit class RewritingOps[T <: AnyRef](val that: T) extends AnyVal {
    def rewritten: Rewritten[T] = Rewritten(that)
  }

  private val never: PartialFunction[AnyRef, Boolean] = {
    case _ => false
  }

  case class Rewritten[T <: AnyRef](
    that: T,
    stopper: AnyRef => Boolean = never
  ) {

    def stoppingAt(stop: PartialFunction[AnyRef, Boolean]): Rewritten[T] =
      copy(stopper = stop.orElse(never))

    def bottomUp(pf: PartialFunction[AnyRef, AnyRef]): T =
      that.endoRewrite(util.bottomUp(Rewriter.lift(pf), stopper))

    def topDown(pf: PartialFunction[AnyRef, AnyRef]): T =
      that.endoRewrite(util.topDown(Rewriter.lift(pf), stopper))
  }

}