Module: Hydra::Derivatives::ShellBasedProcessor

Extended by:
ActiveSupport::Concern
Included in:
Document, Jpeg2kImage
Defined in:
lib/hydra/derivatives/shell_based_processor.rb

Defined Under Namespace

Modules: ClassMethods

Instance Method Summary collapse

Instance Method Details

#encode_file(dest_path, file_suffix, mime_type, options) ⇒ Object 



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# File 'lib/hydra/derivatives/shell_based_processor.rb', line 32

def encode_file(dest_path, file_suffix, mime_type, options)
  out_file = nil
  output_file = Dir::Tmpname.create(['sufia', ".#{file_suffix}"], Hydra::Derivatives.temp_file_base){}
  Hydra::Derivatives::TempfileService.create(source_file) do |f|
    self.class.encode(f.path, options, output_file)
  end
  out_file = File.open(output_file, "rb")
  object.add_file(out_file.read, path: dest_path, mime_type: mime_type)
  File.unlink(output_file)
end

#options_for(format) ⇒ Object

override this method in subclass if you want to provide specific options. returns a hash of options that the specific processors use



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# File 'lib/hydra/derivatives/shell_based_processor.rb', line 28

def options_for(format)
  {}
end

#process ⇒ Object 



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# File 'lib/hydra/derivatives/shell_based_processor.rb', line 16

def process
  directives.each do |name, args|
    format = args[:format]
    raise ArgumentError, "You must provide the :format you want to transcode into. You provided #{args}" unless format
    # TODO if the source is in the correct format, we could just copy it and skip transcoding.
    output_file_name = args[:datastream] || output_file_id(name)
    encode_file(output_file_name, format, new_mime_type(format), options_for(format))
  end
end