Class: ActiveSupport::Callbacks::Callback

Inherits:
Object
  • Object
show all
Defined in:
lib/active_support/callbacks.rb

Overview

:nodoc:#

Constant Summary collapse

@@_callback_sequence = 
0

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(chain, filter, kind, options, klass) ⇒ Callback

Returns a new instance of Callback.



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# File 'lib/active_support/callbacks.rb', line 96

def initialize(chain, filter, kind, options, klass)
  @chain, @kind, @klass = chain, kind, klass
  deprecate_per_key_option(options)
  normalize_options!(options)

  @raw_filter, @options = filter, options
  @filter               = _compile_filter(filter)
  recompile_options!
end

Instance Attribute Details

#chain ⇒ Object

Returns the value of attribute chain.



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# File 'lib/active_support/callbacks.rb', line 94

def chain
  @chain
end

#filter ⇒ Object

Returns the value of attribute filter.



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# File 'lib/active_support/callbacks.rb', line 94

def filter
  @filter
end

#kind ⇒ Object

Returns the value of attribute kind.



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# File 'lib/active_support/callbacks.rb', line 94

def kind
  @kind
end

#klass ⇒ Object

Returns the value of attribute klass.



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# File 'lib/active_support/callbacks.rb', line 94

def klass
  @klass
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/active_support/callbacks.rb', line 94

def options
  @options
end

#raw_filter ⇒ Object

Returns the value of attribute raw_filter.



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# File 'lib/active_support/callbacks.rb', line 94

def raw_filter
  @raw_filter
end

Instance Method Details

#_update_filter(filter_options, new_options) ⇒ Object 



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# File 'lib/active_support/callbacks.rb', line 143

def _update_filter(filter_options, new_options)
  filter_options[:if].concat(Array(new_options[:unless])) if new_options.key?(:unless)
  filter_options[:unless].concat(Array(new_options[:if])) if new_options.key?(:if)
end

#apply(code) ⇒ Object

Wraps code with filter



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# File 'lib/active_support/callbacks.rb', line 156

def apply(code)
  case @kind
  when :before
    <<-RUBY_EVAL
      if !halted && #{@compiled_options}
        # This double assignment is to prevent warnings in 1.9.3 as
        # the `result` variable is not always used except if the
        # terminator code refers to it.
        result = result = #{@filter}
        halted = (#{chain.config[:terminator]})
        if halted
          halted_callback_hook(#{@raw_filter.inspect.inspect})
        end
      end
      #{code}
    RUBY_EVAL
  when :after
    <<-RUBY_EVAL
    #{code}
    if #{!chain.config[:skip_after_callbacks_if_terminated] || "!halted"} && #{@compiled_options}
      #{@filter}
    end
    RUBY_EVAL
  when :around
    name = define_conditional_callback
    <<-RUBY_EVAL
    #{name}(halted) do
      #{code}
      value
    end
    RUBY_EVAL
  end
end

#clone(chain, klass) ⇒ Object 



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# File 'lib/active_support/callbacks.rb', line 112

def clone(chain, klass)
  obj                  = super()
  obj.chain            = chain
  obj.klass            = klass
  obj.options          = @options.dup
  obj.options[:if]     = @options[:if].dup
  obj.options[:unless] = @options[:unless].dup
  obj
end

#deprecate_per_key_option(options) ⇒ Object 



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# File 'lib/active_support/callbacks.rb', line 106

def deprecate_per_key_option(options)
  if options[:per_key]
    raise NotImplementedError, ":per_key option is no longer supported. Use generic :if and :unless options instead."
  end
end

#duplicates?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_support/callbacks.rb', line 139

def duplicates?(other)
  matches?(other.kind, other.filter)
end

#matches?(_kind, _filter) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_support/callbacks.rb', line 135

def matches?(_kind, _filter)
  @kind == _kind && @filter == _filter
end

#name ⇒ Object 



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# File 'lib/active_support/callbacks.rb', line 127

def name
  chain.name
end

#next_id ⇒ Object 



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# File 'lib/active_support/callbacks.rb', line 131

def next_id
  @@_callback_sequence += 1
end

#normalize_options!(options) ⇒ Object 



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# File 'lib/active_support/callbacks.rb', line 122

def normalize_options!(options)
  options[:if] = Array(options[:if])
  options[:unless] = Array(options[:unless])
end

#recompile!(_options) ⇒ Object 



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# File 'lib/active_support/callbacks.rb', line 148

def recompile!(_options)
  deprecate_per_key_option(_options)
  _update_filter(self.options, _options)

  recompile_options!
end