Exception: NRSER::AbstractMethodError

Inherits:
NotImplementedError
  • Object
show all
Defined in:
lib/nrser/errors.rb

Overview

Extension of Ruby’s NotImplementedError to provide a useful message and convenient constructor for abstract methods.

Examples:


def f
  raise NRSER::AbstractMethodError.new( self, __method__ )

Instance Method Summary collapse

Constructor Details

#initialize(instance, method_name) ⇒ AbstractMethodError

Construct a new ‘AbstractMethodError`.

Parameters:

  • instance (Object) —

    Instance that invoked the abstract method.

  • method_name (Symbol | String) —

    Name of abstract method.



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# File 'lib/nrser/errors.rb', line 27

def initialize instance, method_name
  @instance = instance
  @method_name = method_name
  @method = instance.method @method_name
  
  message = if @method.owner == instance.class
    NRSER.dedent "      Method \#{ @method.owner.name }#\#{ @method_name } is abstract, meaning \n      \#{ @method.owner.name } is an abstract class and the invoking \n      instance \#{ @instance } should NOT have been constructed.\n    END\n  else\n    NRSER.squish <<-END\n      Method \#{ @method.owner.name }#\#{ @method_name } is abstract and \n      has not been implemented in invoking class \#{ @instance.class }.\n      \n      If you *are* developing the invoking class \#{ @instance.class } it\n      (or a parent class between it and \#{ @method.owner.name }) must \n      implement #\#{ @method_name }.\n      \n      If you *are not* developing \#{ @instance.class } it should be treated\n      as an abstract base class and should NOT be constructed. You need to\n      find a subclass of \#{ @instance.class } to instantiate or write \n      your own.\n    END\n  end\n  \n  super message\nend\n"