Class: ImageProcessing::Pipeline

Inherits:
Object
  • Object
show all
Includes:
Chainable
Defined in:
lib/image_processing/pipeline.rb

Instance Method Summary collapse

Methods included from Chainable

#branch, #call, #convert, #custom, #default_options, #loader, #method_missing, #operation, #saver, #source

Constructor Details

#initialize(options) ⇒ Pipeline

Returns a new instance of Pipeline.



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# File 'lib/image_processing/pipeline.rb', line 7

def initialize(options)
  @default_options = options
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class ImageProcessing::Chainable

Instance Method Details

#call!(save: true, destination: nil) ⇒ Object 



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# File 'lib/image_processing/pipeline.rb', line 11

def call!(save: true, destination: nil)
  fail Error, "source file is not provided" unless default_options[:source]

  image_class = default_options[:processor]::IMAGE_CLASS

  if default_options[:source].is_a?(image_class)
    source = default_options[:source]
  elsif default_options[:source].is_a?(String)
    source = default_options[:source]
  elsif default_options[:source].respond_to?(:path)
    source = default_options[:source].path
  elsif default_options[:source].respond_to?(:to_path)
    source = default_options[:source].to_path
  else
    fail Error, "source file needs to respond to #path, or be a String, a Pathname, or a #{image_class} object"
  end

  processor = default_options[:processor].new
  image     = processor.load_image(source, default_options[:loader])

  default_options[:operations].each do |name, args|
    if name == :custom
      image = args.first.call(image) || image
    else
      image = processor.apply_operation(name, image, *args)
    end
  end

  return image unless save

  return processor.save_image(image, destination, default_options[:saver]) if destination

  source_path = source if source.is_a?(String)
  format      = default_options[:format] || File.extname(source_path.to_s)[1..-1] || "jpg"

  result = Tempfile.new(["image_processing", ".#{format}"], binmode: true)

  begin
    processor.save_image(image, result.path, default_options[:saver])
  rescue
    result.close!
    raise
  end

  result.open
  result
end