com.madgag.git.bfg.cleaner.CleaningMapper.scala Maven / Gradle / Ivy

Go to download
/*
 * Copyright (c) 2012 Roberto Tyley
 *
 * This file is part of 'BFG Repo-Cleaner' - a tool for removing large
 * or troublesome blobs from Git repositories.
 *
 * BFG Repo-Cleaner 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.
 *
 * BFG Repo-Cleaner 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 com.madgag.git.bfg.cleaner

trait CleaningMapper[V] {

  // endomorphism - scalaz.Endo?
  val clean: V => V

  def isDirty(v: V) = clean(v) != v

  def objectIdSubstitution(oldId: V): Option[(V, V)] = {
    val newId = clean(oldId)
    if (newId == oldId) None else Some((oldId, newId))
  }
}