Class: PackerFiles::Utils::TypeAccessor

Inherits:
Object
  • Object
show all
Defined in:
lib/PackerFiles/Utils/TypeAccessor.rb

Overview

The Type accessor class is used as a meta-class for any class.

Direct Known Subclasses

Builder, Virtual::Hypervisors

Class Method Summary collapse

Class Method Details

.proc_from(&block) ⇒ Object

Given a block, convert it into a proc. if no block is given then it is a nil object that is returned



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# File 'lib/PackerFiles/Utils/TypeAccessor.rb', line 57

def proc_from(&block)
  if block_given?
     Proc.new
  else
     nil
  end
end

.type_accessor(type, name = type.name.gsub(/.*::/, ''), optional = false) ⇒ Object

Custom accessor to create accessors from type name. It is also Possible to set the name of the accessor. By default it is the name of the type.



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# File 'lib/PackerFiles/Utils/TypeAccessor.rb', line 27

def type_accessor(type, name     = type.name.gsub(/.*::/, ''), 
		 optional = false)

   # Save the type and name in a array hash, which will be used later.
   @types ||= Hash.new
   @types[name] = [type, optional]

   # Doing a class_eval creates a new method of "name"
   class_eval do
   
     # Read/Write accessor which accepts blocks for initialization.
     define_method("#{name}") do |arg = nil, &block|
if (self.class.proc_from(&block).nil?)
   instance_variable_get("@#{name}")
else
   obj = type.new(&block)
   instance_variable_set("@#{name}", obj)
end
     end # define_method
   end # class_eval

end

.type_accessors ⇒ Object

Return the Hash that is used to track registered type accessors



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# File 'lib/PackerFiles/Utils/TypeAccessor.rb', line 51

def type_accessors
  @types
end