Class: Edgarj::EnumCache

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/edgarj/enum_cache.rb

Overview

build map: value -> label on-the-fly

Instance Method Summary collapse

Constructor Details

#initialize ⇒ EnumCache

Returns a new instance of EnumCache.



6
7
8
9
10
11
 
# File 'lib/edgarj/enum_cache.rb', line 6

def initialize
  @enum_map = {}

  # for stat
  @hit = @out = @out_of_enum = 0
end

Instance Method Details

#label(rec, attr, enum = nil) ⇒ Object

return label of ‘rec.attr’, where attr is enum value.



14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
# File 'lib/edgarj/enum_cache.rb', line 14

def label(rec, attr, enum = nil)
  if !enum
    enum = rec.class.const_get(attr.to_s.camelize)
    raise(NameError, "wrong constant name #{attr}") if !enum
  end
  if !@enum_map[enum]
    @enum_map[enum] = {}
  end
  value = rec.attributes[attr.to_s]
  if label = @enum_map[enum][value]
    @hit += 1
    label
  else
    member = enum.constants.detect{|m|
                enum.const_get(m) == value
             }
    @enum_map[enum][value] = 
        if member
          @out += 1
          rec.class.human_const_name(enum, member)
        else
          @out_of_enum += 1
          '??'
        end
  end
end

#stat ⇒ Object

return statistic information of hit, out, out_of_enum.



42
43
44
 
# File 'lib/edgarj/enum_cache.rb', line 42

def stat
  [@hit, @out, @out_of_enum]
end