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Contents
# Based on http://blog.rubybestpractices.com/posts/aaronp/001_double_dispatch_dance.html
module Metamorpher
module Visitable
class Visitor
###
# This method will examine the class and ancestors of +thing+. For each
# class in the "ancestors" list, it will check to see if the visitor knows
# how to handle that particular class. If it can't find a handler for the
# +thing+ it will raise an exception.
def visit(thing)
thing.class.ancestors.each do |ancestor|
method_name = :"visit_#{ancestor.name.split("::").last.downcase}"
return send(method_name, thing) if respond_to?(method_name)
end
fail ArgumentError, "Can't visit #{thing.class}"
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems