whoami7 - Manager
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proc
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self
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root
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usr
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local
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rvm
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gems
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ruby-2.1.10@system
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gems
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puppet-3.4.3
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lib
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puppet
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pops
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files >> //proc/self/root/usr/local/rvm/gems/ruby-2.1.10@system/gems/puppet-3.4.3/lib/puppet/pops/visitor.rb
# A Visitor performs delegation to a given receiver based on the configuration of the Visitor. # A new visitor is created with a given receiver, a method prefix, min, and max argument counts. # e.g. # vistor = Visitor.new(self, "visit_from", 1, 1) # will make the visitor call "self.visit_from_CLASS(x)" where CLASS is resolved to the given # objects class, or one of is ancestors, the first class for which there is an implementation of # a method will be selected. # # Raises RuntimeError if there are too few or too many arguments, or if the receiver is not # configured to handle a given visiting object. # class Puppet::Pops::Visitor attr_reader :receiver, :message, :min_args, :max_args, :cache def initialize(receiver, message, min_args=0, max_args=nil) raise ArgumentError.new("min_args must be >= 0") if min_args < 0 raise ArgumentError.new("max_args must be >= min_args or nil") if max_args && max_args < min_args @receiver = receiver @message = message @min_args = min_args @max_args = max_args @cache = Hash.new end # Visit the configured receiver def visit(thing, *args) visit_this(@receiver, thing, *args) end # Visit an explicit receiver def visit_this(receiver, thing, *args) raise "Visitor Error: Too few arguments passed. min = #{@min_args}" unless args.length >= @min_args if @max_args raise "Visitor Error: Too many arguments passed. max = #{@max_args}" unless args.length <= @max_args end if method_name = @cache[thing.class] return receiver.send(method_name, thing, *args) else thing.class.ancestors().each do |ancestor| method_name = :"#{@message}_#{ancestor.name.split("::").last}" # DEBUG OUTPUT # puts "Visitor checking: #{receiver.class}.#{method_name}, responds to: #{@receiver.respond_to? method_name}" next unless receiver.respond_to? method_name @cache[thing.class] = method_name return receiver.send(method_name, thing, *args) end end raise "Visitor Error: the configured receiver (#{receiver.class}) can't handle instance of: #{thing.class}" end end
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