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module MIME
#
# Module used only for initializing derived DiscreteMedia objects.
#
module DiscreteMediaFactory
module DispositionParameters
attr_accessor :path, :size
end
class << self
include ContentTypes
#
# Creates a corresponding DiscreteMedia subclass object for the given
# +file+ based on +file+'s filename extension. +file+ can be a file path
# or File object.
#
# +content_type+ can be specified in order to override the auto detected
# content type. If the +content_type+ cannot be detected, an
# UnknownContentError exception will be raised.
#
# Creates and sets the singleton method +path+ on the created object. The
# +path+ method is utilized by other methods in the MIME library,
# therefore, eliminating redundant and explicit filename assignments.
#
# === Comparison Example
#
# file1 = '/tmp/file1.txt'
# file2 = '/tmp/file2.txt'
# entity1 = Text.new(File.read(file1))
# entity2 = DiscreteMediaFactory.create(file2)
#
# mixed_msg = Multipart::Mixed.new
# mixed_msg.attach(entity1, 'filename' => file1)
# mixed_msg.attach(entity2) # filename automatically added
#
def create file, content_type = nil
if file.is_a? File
cntnt = file.read
ctype = content_type || file_type(file.path)
fname = file.path
else
cntnt = IO.read(file)
ctype = content_type || file_type(file)
fname = file
end
type, subtype = ctype.to_s.split('/')
if type.to_s.empty? || subtype.to_s.empty?
raise UnknownContentError, "invalid content type: #{ctype}"
end
media_obj =
case type
when 'application'; Application.new(cntnt, subtype)
when 'audio' ; Audio.new(cntnt, subtype)
when 'image' ; Image.new(cntnt, subtype)
when 'text' ; Text.new(cntnt, subtype)
when 'video' ; Video.new(cntnt, subtype)
else raise UnknownContentError, "invalid content type: #{ctype}"
end
media_obj.extend(DispositionParameters)
media_obj.path = fname
media_obj
end
end
end
end
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