Class: Hydra::FileCharacterization::Characterizer

Inherits:
Object
  • Object
show all
Includes:
Open3
Defined in:
lib/hydra/file_characterization/characterizer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename) ⇒ Characterizer

Returns a new instance of Characterizer.



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# File 'lib/hydra/file_characterization/characterizer.rb', line 12

def initialize(filename)
  @filename = filename
end

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/hydra/file_characterization/characterizer.rb', line 11

def filename
  @filename
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/hydra/file_characterization/characterizer.rb', line 16

def call
  unless File.exists?(filename)
    raise Hydra::FileCharacterization::FileNotFoundError.new("File: #{filename} does not exist.")
  end
  stdin, stdout, stderr, wait_thr = popen3(command)
  begin
    out = stdout.read
    err = stderr.read
    exit_status = wait_thr.value
    raise "Unable to execute command \"#{command}\"\n#{err}" unless exit_status.success?
    out
  ensure
    stdin.close
    stdout.close
    stderr.close
  end
end