Class: Rubydora::ArrayWithCallback

Inherits:
Array
  • Object
show all
Defined in:
lib/rubydora/array_with_callback.rb

Overview

This is an attempt to implement an Array-like object that calls a method after data is modified

Instance Method Summary collapse

Instance Method Details

#call_on_change(changes = {}) ⇒ Object

duck-typing Rubydora::Callbacks call_* methods



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# File 'lib/rubydora/array_with_callback.rb', line 28

def call_on_change changes = {}
  self.on_change.each do |h|
    h.call(self, changes)
  end
end

#method ⇒ Object

FIXME: It would be nice to use Rubydora::Callbacks here, however, this method requires instance-level callbacks



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# File 'lib/rubydora/array_with_callback.rb', line 10

[:<<, :collect!, :map!, :compact!, :concat, :delete, :delete_at, :delete_if, :pop, :push, :reject!, :replace, :select!, :[]=, :slice!, :uniq! ].each do |method|
  class_eval <<-RUBY
    def #{method.to_s} *args, &blk
      old = self.dup
      res = super(*args, &blk)
      call_on_change({:+ => self - old, :- => old - self})
      res
    end
  RUBY
end

#on_change ⇒ Object

duck-typing Rubydora::Callbacks @hooks and accessor



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# File 'lib/rubydora/array_with_callback.rb', line 22

def on_change
  @hooks ||= {}
  @hooks[:on_change] ||= []
end