module Scrivito
module Backend

module Index

  IMPLEMENTATIONS = [
    Backend::PathIndex,
    Backend::ParentPathIndex,
    Backend::PermalinkIndex,
  ].freeze

  IMPLEMENTATION_BY_NAME = IMPLEMENTATIONS.inject({}) do |result, index|
    result.merge(index.id => index)
  end

  def self.by_name(name)
    IMPLEMENTATION_BY_NAME[name.to_s] or
      raise Scrivito::InternalError, "unknown index #{name}"
  end

end

end
end