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# encoding: utf-8
module Mail
module Encodings
class TransferEncoding
NAME = ''
PRIORITY = -1
def self.can_transport?(enc)
enc = Encodings.get_name(enc)
if Encodings.defined? enc
Encodings.get_encoding(enc).new.is_a? self
else
false
end
end
def self.can_encode?(enc)
can_transport? enc
end
def self.cost(str)
raise "Unimplemented"
end
def self.to_s
self::NAME
end
def self.get_best_compatible(source_encoding, str)
if self.can_transport? source_encoding then
source_encoding
else
choices = []
Encodings.get_all.each do |enc|
choices << enc if self.can_transport? enc and enc.can_encode? source_encoding
end
best = nil
best_cost = 100
choices.each do |enc|
this_cost = enc.cost str
if this_cost < best_cost then
best_cost = this_cost
best = enc
elsif this_cost == best_cost then
best = enc if enc::PRIORITY < best::PRIORITY
end
end
best
end
end
def to_s
self.class.to_s
end
end
end
end
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