1
2
3
4
5
6
7
8
9
10
11
12
13
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
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
module Virtus
class Attribute
# Accessor extension provides methods to read and write attributes
#
# @example
#
# attribute = Virtus::Attribute.build(String, :name => :email)
# model = Class.new { attr_reader :email }
# object = model.new
#
# attribute.set(object, 'jane@doe.com')
# attribute.get(object) # => 'jane@doe.com'
#
module Accessor
# Return name of this accessor attribute
#
# @return [Symbol]
#
# @api public
attr_reader :name
# Return instance_variable_name used by this accessor
#
# @api private
attr_reader :instance_variable_name
# @api private
def self.extended(descendant)
super
name = descendant.options.fetch(:name).to_sym
descendant.instance_variable_set('@name', name)
descendant.instance_variable_set('@instance_variable_name', "@#{name}")
end
# Return if attribute value is defined
#
# @param [Object] instance
#
# @return [Boolean]
#
# @api public
def defined?(instance)
instance.instance_variable_defined?(instance_variable_name)
end
# Return value of the attribute
#
# @param [Object] instance
#
# @return [Object]
#
# @api public
def get(instance)
instance.instance_variable_get(instance_variable_name)
end
# Set value of the attribute
#
# @param [Object] instance
# @param [Object] value
#
# @return [Object] value that was set
#
# @api public
def set(instance, value)
instance.instance_variable_set(instance_variable_name, value)
end
# Set default value
#
# @param [Object] instance
#
# @return [Object] value that was set
#
# @api public
def set_default_value(instance)
set(instance, default_value.call(instance, self))
end
# Returns a Boolean indicating whether the reader method is public
#
# @return [Boolean]
#
# @api private
def public_reader?
options[:reader] == :public
end
# Returns a Boolean indicating whether the writer method is public
#
# @return [Boolean]
#
# @api private
def public_writer?
options[:writer] == :public
end
end # Accessor
end # Attribute
end # Virtus
|
