activerecord/lib/active_record/connection_adapters/type/type_map.rb


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module ActiveRecord
  module ConnectionAdapters
    module Type
      class TypeMap # :nodoc:
        def initialize
          @mapping = {}
        end

        def lookup(lookup_key, *args)
          matching_pair = @mapping.reverse_each.detect do |key, _|
            key === lookup_key
          end

          if matching_pair
            matching_pair.last.call(lookup_key, *args)
          else
            default_value
          end
        end

        def register_type(key, value = nil, &block)
          raise ::ArgumentError unless value || block

          if block
            @mapping[key] = block
          else
            @mapping[key] = proc { value }
          end
        end

        def alias_type(key, target_key)
          register_type(key) do |sql_type, *args|
            metadata = sql_type[/\(.*\)/, 0]
            lookup("#{target_key}#{metadata}", *args)
          end
        end

        def clear
          @mapping.clear
        end

        private

        def default_value
          @default_value ||= Value.new
        end
      end
    end
  end
end