sjsonnet.ParseCache.scala Maven / Gradle / Ivy

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package sjsonnet

import scala.collection.Iterator

// Trait extended by JsonnetWorker (in universe) so that it can pass the cache based on Caffeine to main0 here
trait ParseCache {
  def getOrElseUpdate(key: (Path, String), defaultValue:  => Either[Error, (Expr, FileScope)]): Either[Error, (Expr, FileScope)]
}

// A default implementation based on a mutable HashMap. This implementation is not thread-safe.
class DefaultParseCache extends ParseCache {
  val cache = new scala.collection.mutable.HashMap[(Path, String), Either[Error, (Expr, FileScope)]]()

  // parseCache.getOrElseUpdate((path, txt), {...})
  override def getOrElseUpdate(key: (Path, String), defaultValue:  => Either[Error, (Expr, FileScope)]): Either[Error, (Expr, FileScope)] = {
    cache.getOrElseUpdate(key, defaultValue)
  }

  // parseCache.valuesIterator.map(_.getOrElse(???)).map(_._1).toSeq
  def valuesIterator: Iterator[Either[Error, (Expr, FileScope)]] = {
    cache.valuesIterator
  }

  // parseCache.keySet.toIndexedSeq
  def keySet: scala.collection.Set[(Path, String)] = {
    cache.keySet
  }
}