Class: Hyrax::FileSetDerivativesService

Inherits:
Object
  • Object
show all
Defined in:
app/services/hyrax/file_set_derivatives_service.rb

Overview

Responsible for creating and cleaning up the derivatives of a file_set

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file_set) ⇒ FileSetDerivativesService

Returns a new instance of FileSetDerivativesService.

Parameters:

  • file_set (Hyrax::FileSet) —

    At least for this class, it must have #uri and #mime_type



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# File 'app/services/hyrax/file_set_derivatives_service.rb', line 9

def initialize(file_set)
  @file_set = file_set
end

Instance Attribute Details

#file_set ⇒ Object (readonly)

Returns the value of attribute file_set.



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# File 'app/services/hyrax/file_set_derivatives_service.rb', line 5

def file_set
  @file_set
end

Instance Method Details

#cleanup_derivatives ⇒ Object 



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# File 'app/services/hyrax/file_set_derivatives_service.rb', line 22

def cleanup_derivatives
  derivative_path_factory.derivatives_for_reference(file_set).each do |path|
    FileUtils.rm_f(path)
  end
end

#create_derivatives(filename) ⇒ Object 



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# File 'app/services/hyrax/file_set_derivatives_service.rb', line 32

def create_derivatives(filename)
  case mime_type
  when *file_set.class.pdf_mime_types             then create_pdf_derivatives(filename)
  when *file_set.class.office_document_mime_types then create_office_document_derivatives(filename)
  when *file_set.class.audio_mime_types           then create_audio_derivatives(filename)
  when *file_set.class.video_mime_types           then create_video_derivatives(filename)
  when *file_set.class.image_mime_types           then create_image_derivatives(filename)
  end
end

#derivative_url(destination_name) ⇒ Object

The destination_name parameter has to match up with the file parameter passed to the DownloadsController



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# File 'app/services/hyrax/file_set_derivatives_service.rb', line 44

def derivative_url(destination_name)
  path = derivative_path_factory.derivative_path_for_reference(derivative_url_target, destination_name)
  URI("file://#{path}").to_s
end

#uri ⇒ Object 



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# File 'app/services/hyrax/file_set_derivatives_service.rb', line 13

def uri
  # If given a FileMetadata object, use its parent ID.
  if file_set.respond_to?(:file_set_id)
    file_set.file_set_id.to_s
  else
    file_set.uri
  end
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/services/hyrax/file_set_derivatives_service.rb', line 28

def valid?
  supported_mime_types.include?(mime_type)
end