Contents

#
#       ActiveFacts Runtime API
#       RoleValues, manages the set of instances involved in a many_to_one relationship.
#
# Copyright (c) 2009 Clifford Heath. Read the LICENSE file.
#
# There are two implementations here, one using an array and one using a hash.
# The hash one has problems with keys being changed during object deletion, so
# cannot be used yet; a fix is upcoming and will improve performance of large sets.
#
module ActiveFacts
  module API

    class RoleValues  #:nodoc:
      include Enumerable

      def initialize
        @a = []
      end

      def each &b
        # REVISIT: Provide a configuration variable to enable this heckling during testing:
        #@a.sort_by{rand}.each &b
        @a.each &b
      end

      def size
        @a.size
      end

      def empty?
        @a.size == 0
      end

      def +(a)
        @a.+(a.is_a?(RoleValues) ? Array(a) : a)
      end

      def -(a)
        @a - a
      end

      def single
        @a.size > 1 ? nil : @a[0]
      end

      def update(old, value)
        @a.delete(old) if old
        @a << value if value
      end

      def verbalise
        "["[e-mail]_a.map{|e| e.verbalise}*", "+"]"
      end

    end

  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
activefacts-api-0.8.12	lib/activefacts/api/role_values.rb
activefacts-api-0.8.10	lib/activefacts/api/role_values.rb