Class: Arrest::DefaultClassLoader

Inherits:
Object
  • Object
show all
Defined in:
lib/arrest/default_class_loader.rb

Overview

Classloader that specifies the deferred class loading strategy for the user. It is registered as default class loader in the Arrest::Source. The default implementation tries to load the class specified by the given symbol parameter in the following order: 1) from the given module utilising Arrest (in our case SGDB) 2) from Arrest itself (e.g. :Ref) 3) from the Kernel (for all basic types - String, Integer etc)

Instance Method Summary collapse

Instance Method Details

#load(sym) ⇒ Object 



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# File 'lib/arrest/default_class_loader.rb', line 12

def load(sym)
  # Using const_get is effectively a hack - it uses the fact that class names are also constants to allow you to get hold of them.
  # Better use eval if possible

  clazz =
    begin
      eval("#{Source.mod.to_s}::#{sym}") unless Source.mod == Kernel
    rescue NameError
    end


  clazz ||=
    begin
      eval("Arrest::#{sym}")
    rescue NameError
    end

  clazz ||=
    begin
      Kernel.const_get(sym)
    rescue NameError
    end

  raise "Class #{sym} could not be loaded! Tried module if given, with fallback Arrest and Kernel" unless clazz
  clazz
end