In mem artifact source

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use "collections"
use "../utils"

class InMemArtifactSource is ArtifactSource
  let artifact_sets_by_name: Map[String, Set[Artifact]] = Map[String, Set[Artifact]]

  fun ref add(a: Artifact) =>
    try
      artifact_sets_by_name(a.name)?.set(a)
    else
      artifact_sets_by_name(a.name) = Set[Artifact].>set(a)
    end

  fun ref all_versions_of(name: String): Iterator[Artifact] =>
    try
      artifact_sets_by_name(name)?.values()
    else
      EmptyIterator[Artifact]
    end