Class: Lolita::LazyLoader

Inherits:
Object show all
Defined in:
lib/lolita/lazy_loader.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lazy_class, *args, &block) ⇒ LazyLoader

Returns a new instance of LazyLoader.



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# File 'lib/lolita/lazy_loader.rb', line 22

def initialize(lazy_class,*args,&block)
  @args = args || []
  @lazy_class=lazy_class
  @eval_block=block
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object 



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# File 'lib/lolita/lazy_loader.rb', line 32

def method_missing(method_name,*args,&block)
  unless @class_instance
    @args = @args.empty? && [nil] || @args
    arity=@lazy_class.instance_method(:initialize).arity
    if arity==-1 # when expectign *args
      @class_instance=@lazy_class.new(*@args,&@eval_block)
    elsif arity.abs>0 # when expecting specific number of arguments without any *args
      @class_instance=@lazy_class.new(*@args.slice(0..arity.abs-1),&@eval_block)
    else
      @class_instance=@lazy_class.new(&@eval_block)
    end
  end
  if @class_instance.respond_to?(:after_initialize,true)
    @class_instance.__send__(:after_initialize)
  end
  @class_instance.__send__(method_name,*args,&block)
end

Class Method Details

.lazy_load(instance_name, var_name, lazy_class, *args, &block) ⇒ Object

attr_reader :lazy_class,:eval_block,:class_instance



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# File 'lib/lolita/lazy_loader.rb', line 6

def self.lazy_load(instance_name,var_name,lazy_class,*args,&block)
  temp_var = instance_name.instance_variable_get(var_name)
  is_loader = temp_var.to_s =~ /Lolita::LazyLoader/
  if !temp_var || ((args && args.any? && is_loader && temp_var.__is_args_diff__(args)) || block_given?)
    temp_var = instance_name.instance_variable_set(var_name,self.new(lazy_class,*args,&block))
  end
  if temp_var.to_s =~ /Lolita::LazyLoader/
    temp_var = instance_name.instance_variable_set(var_name,temp_var.class_instance)
  end
  temp_var
end

Instance Method Details

#__is_args_diff__(args) ⇒ Object 



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# File 'lib/lolita/lazy_loader.rb', line 18

def __is_args_diff__(args)
  @args != args
end

#class_instance ⇒ Object 



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# File 'lib/lolita/lazy_loader.rb', line 28

def class_instance
  @class_instance || self
end