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Contents
module Exchange
# The gem loader takes care of loading gems without adding too many unnecessary dependencies to the gem
# @author Beat Richartz
# @version 0.6
# @since 0.6
#
class GemLoader
# The error that gets thrown if a needed gem is not available or loadable
#
GemNotFoundError = Class.new LoadError
# initialize the loader with a gem name.
# @param [string] gem The gem to require
# @return [Exchange::Gemloader] an instance of the gemloader
# @example initialize a loader for the nokogiri gem
# Exchange::GemLoader.new('nokogiri')
#
def initialize gem
@gem = gem
end
# Try to require the gem specified on initialization.
# @raise [GemNotFoundError] an error indicating that the gem could not be found rather than a load error
# @example Try to load the JSON gem
# Exchange::GemLoader.new('json').try_load
#
def try_load
require @gem
rescue LoadError => e
raise GemNotFoundError.new("You specified #{@gem} to be used with Exchange, yet it is not loadable. Please install #{@gem} to be able to use it with Exchange")
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems