class Arel::Visitors::Visitor
Public Class Methods
Source
# File lib/arel/visitors/visitor.rb, line 15 def self.dispatch_cache Hash.new do |hash, klass| hash[klass] = "visit_#{(klass.name || '').gsub('::', '_')}" end end
Source
# File lib/arel/visitors/visitor.rb, line 5 def initialize @dispatch = get_dispatch_cache end
Public Instance Methods
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# File lib/arel/visitors/visitor.rb, line 9 def accept object visit object end
Private Instance Methods
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# File lib/arel/visitors/visitor.rb, line 21 def get_dispatch_cache self.class.dispatch_cache end
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# File lib/arel/visitors/visitor.rb, line 29 def visit object dispatch_method = dispatch[object.class] send dispatch_method, object rescue NoMethodError => e raise e if respond_to?(dispatch_method, true) superklass = object.class.ancestors.find { |klass| respond_to?(dispatch[klass], true) } raise(TypeError, "Cannot visit #{object.class}") unless superklass dispatch[object.class] = dispatch[superklass] retry end