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# -*- ruby encoding: utf-8 -*-
class MIME::Types
# Caching of MIME::Types registries is advisable if you will be loading
# the default registry relatively frequently. With the class methods on
# MIME::Types::Cache, any MIME::Types registry can be marshaled quickly
# and easily.
#
# The cache is invalidated on a per-version basis; a cache file for
# version 2.0 will not be reused with version 2.0.1.
Cache = Struct.new(:version, :data)
class << Cache
# Attempts to load the cache from the file provided as a parameter or in
# the environment variable +RUBY_MIME_TYPES_CACHE+. Returns +nil+ if the
# file does not exist, if the file cannot be loaded, or if the data in
# the cache version is different than this version.
def load(cache_file = nil)
cache_file = cache_file || ENV['RUBY_MIME_TYPES_CACHE']
return nil unless cache_file and File.exist?(cache_file)
cache = Marshal.load(File.binread(cache_file))
if cache.version == MIME::Types::VERSION
Marshal.load(cache.data)
else
warn "Could not load MIME::Types cache: invalid version"
nil
end
rescue => e
warn "Could not load MIME::Types cache: #{e}"
return nil
end
# Attempts to save the types provided to the cache file provided.
#
# If +types+ is not provided or is +nil+, the cache will contain the
# current MIME::Types default registry.
#
# If +cache_file+ is not provided or is +nil+, the cache will be written
# to the file specified in the environment variable
# +RUBY_MIME_TYPES_CACHE+. If there is no cache file specified either
# directly or through the environment, this method will return +nil+
def save(types = nil, cache_file = nil)
cache_file = cache_file || ENV['RUBY_MIME_TYPES_CACHE']
return nil unless cache_file
types = types || MIME::Types.send(:__types__)
File.open(cache_file, 'wb') do |f|
f.write(Marshal.dump(new(types.data_version, Marshal.dump(types))))
end
end
end
# MIME::Types requires a container Hash with a default values for keys
# resulting in an empty array (<tt>[]</tt>), but this cannot be dumped
# through Marshal because of the presence of that default Proc. This class
# exists solely to satisfy that need.
class Container < Hash # :nodoc:
def initialize
super
self.default_proc = ->(h, k) { h[k] = [] }
end
def marshal_dump
{}.merge(self)
end
def marshal_load(hash)
self.default_proc = ->(h, k) { h[k] = [] }
self.merge!(hash)
end
end
end
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