Module: Launchy::DescendantTracker

Included in:
Application, Launchy::Detect::HostOsFamily, Launchy::Detect::NixDesktopEnvironment, Launchy::Detect::RubyEngine, Launchy::Detect::Runner, OSFamily
Defined in:
lib/launchy/descendant_tracker.rb

Overview

Use by either

class Foo
  extend DescendantTracker
end

or

class Foo
  class << self
    include DescendantTracker
  end
end

It will track all the classes that inherit from the extended class and keep them in a Set that is available via the ‘children’ method.

Instance Method Summary collapse

Instance Method Details

#children ⇒ Object

The list of children that are registered



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# File 'lib/launchy/descendant_tracker.rb', line 31

def children
  unless defined? @children
    @children = Set.new
  end
  return @children
end

#find_child(method, *args) ⇒ Object

Find one of the child classes by calling the given method and passing all the rest of the parameters to that method in each child



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# File 'lib/launchy/descendant_tracker.rb', line 42

def find_child( method, *args )
  klass = children.find do |child|
    Launchy.log "Checking if class #{child} is the one for #{method}(#{args.join(', ')})}"
    child.send( method, *args )
  end
end

#inherited(klass) ⇒ Object 



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# File 'lib/launchy/descendant_tracker.rb', line 23

def inherited( klass )
  return unless klass.instance_of?( Class )
  self.children << klass
end