1  # Redmine - project management software
   2  # Copyright (C) 2006-2011  Jean-Philippe Lang
   3  #
   4  # This program is free software; you can redistribute it and/or
   5  # modify it under the terms of the GNU General Public License
   6  # as published by the Free Software Foundation; either version 2
   7  # of the License, or (at your option) any later version.
   8  #
   9  # This program is distributed in the hope that it will be useful,
  10  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  # GNU General Public License for more details.
  13  #
  14  # You should have received a copy of the GNU General Public License
  15  # along with this program; if not, write to the Free Software
  16  # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17 
  18  module Redmine
  19    module SubclassFactory
  20      def self.included(base) 
  21        base.extend ClassMethods
  22      end 
  23 
  24      module ClassMethods
  25        # Returns an instance of the given subclass name
  26        def new_subclass_instance(class_name, *args)
  27          klass = nil
  28          begin
  29            klass = class_name.to_s.classify.constantize
  30          rescue
  31            # invalid class name
  32          end
  33          unless subclasses.include? klass
  34            klass = nil
  35          end
  36          if klass
  37            klass.new(*args)
  38          end
  39        end
  40      end
  41    end
  42  end