Module: Rave::Mixins::ObjectFactory

Included in:
Rave::Models::Annotation, Rave::Models::Element, Rave::Models::Event
Defined in:
lib/mixins/object_factory.rb

Overview

Abstract object that allows you to create instances of the classes inside it based on providing a type name.

Constant Summary collapse

WILDCARD = 
'*'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Attribute Details

#type ⇒ Object (readonly)

:nodoc:



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# File 'lib/mixins/object_factory.rb', line 81

def type
  @type
end

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/mixins/object_factory.rb', line 8

def self.included(base)
  base.class_eval do
    # Store the registered classes in a class instance variable.
    class << self
      attr_reader :class_by_type_mapping
      attr_reader :class_by_pattern_mapping
    end

    @class_by_type_mapping = {}
    @class_by_pattern_mapping = {}

    class_eval("      def self.classes_by_type\n        ::\#{self.name}.class_by_type_mapping\n      end\n      def self.classes_by_pattern\n        ::\#{self.name}.class_by_pattern_mapping\n      end\n    END\n\n    # Object factory method.\n    #\n    # :type - Type of object to create [String]\n    def self.create(type, *args, &block)\n      if classes_by_type.has_key? type\n        return classes_by_type[type].new(*args, &block)\n      elsif\n        # Check for pattern-based types. Check for longer matches before shorter ones.\n        patterns = classes_by_pattern.keys.sort { |a, b| b.to_s.length <=> a.to_s.length }\n        patterns.each do |pattern|\n          if type =~ pattern\n            return classes_by_pattern[pattern].new($1, *args, &block)\n          end\n        end\n        raise ArgumentError.new(\"Unknown \#{self} type \#{type}\")\n      end\n    end\n\n    # Is this type able to be created?\n    def self.valid_type?(type)\n      classes_by_type.has_key? type\n    end\n\n    # Register this class with its factory.\n    def self.factory_register(type)\n      classes_by_type[type] = self\n\n      # * in a type indicates a wildcard.\n      if type[WILDCARD]\n        classes_by_pattern[/^\#{type.sub(WILDCARD, '(.*)')}$/] = self\n      end\n      \n      class << self\n        def type; @type.dup; end\n      end\n\n      @type = type\n\n    end\n\n    # Classes that can be generated by the factory [Array of Class]\n    def self.classes\n      classes_by_type.values\n    end\n\n    # Types that can be generated by the factory [Array of String]\n    def self.types\n      classes_by_type.keys\n    end\n  end\nend\n", __FILE__, __LINE__)