Class: DataMapper::Types::Flag

Inherits:
Object
  • Object
show all
Defined in:
lib/dm-types/flag.rb

Class Method Summary collapse

Class Method Details

.[](*flags) ⇒ Object 



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# File 'lib/dm-types/flag.rb', line 24

def self.[](*flags)
  new(*flags)
end

.dump(value, property) ⇒ Object 



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# File 'lib/dm-types/flag.rb', line 43

def self.dump(value, property)
  return if value.nil?
  flags = value.is_a?(Array) ? value : [value]
  flags.map!{ |f| f.to_sym }
  flag_map.invert.values_at(*flags.flatten).compact.inject(0) { |sum, i| sum + i }
end

.flag_map ⇒ Object 



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# File 'lib/dm-types/flag.rb', line 5

def self.flag_map
  @flag_map
end

.flag_map=(value) ⇒ Object 



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# File 'lib/dm-types/flag.rb', line 9

def self.flag_map=(value)
  @flag_map = value
end

.load(value, property) ⇒ Object 



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# File 'lib/dm-types/flag.rb', line 28

def self.load(value, property)
  begin
    matches = []

    0.upto((Math.log(value) / Math.log(2)).ceil) do |i|
      pow = 2 ** i
      matches << flag_map[pow] if value & pow == pow
    end

    matches.compact
  rescue TypeError, Errno::EDOM
    []
  end
end

.new(*flags) ⇒ Object 



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# File 'lib/dm-types/flag.rb', line 13

def self.new(*flags)
  type = Flag.clone  # cannot dup a Class
  type.flag_map = {}

  flags.each_with_index do |flag, i|
    type.flag_map[2 ** i] = flag
  end

  type
end