class Hydra::Works::PersistDerivative
Public Class Methods
Persists a derivative to a FileSet
This Service conforms to the signature of `Hydra::Derivatives::PersistOutputFileService`. The purpose of this Service is for use as an alternative to the default Hydra::Derivatives::PersistOutputFileService. It's necessary because the default behavior in Hydra::Derivatives assumes that you're using LDP Basic Containment. Hydra::Works::FileSets use IndirectContainment. This Service handles that case. This service will always update existing and does not do versioning of persisted files.
@param [#read] stream the derivative filestream @param [Hash] directives @option directives [FileSet] :object the FileSet
object to attach to @option directives [Symbol] :label the type of derivative extract file type symbol (e.g. :thumbnail) from Hydra::Derivatives created destination_name
# File lib/hydra/works/services/persist_derivative.rb, line 18 def self.call(stream, directives) file = Hydra::Derivatives::IoDecorator.new(stream) file.mime_type = new_mime_type(directives.fetch(:format)) object = directives.fetch(:object) type = directives.fetch(:label) Hydra::Works::AddFileToFileSet.call(object, file, type, update_existing: true, versioning: false) end
# File lib/hydra/works/services/persist_derivative.rb, line 26 def self.new_mime_type(format) case format when 'mp4' 'video/mp4' # default is application/mp4 when 'webm' 'video/webm' # default is audio/webm else MIME::Types.type_for(format).first.to_s end end