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# Redmine - project management software

# Copyright (C) 2006-2012  Jean-Philippe Lang

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

module Redmine

  module SubclassFactory

    def self.included(base) 

      base.extend ClassMethods

    end 

    module ClassMethods

      def get_subclass(class_name)

        klass = nil

        begin

          klass = class_name.to_s.classify.constantize

        rescue

          # invalid class name

        end

        unless subclasses.include? klass

          klass = nil

        end

        klass

      end

      # Returns an instance of the given subclass name

      def new_subclass_instance(class_name, *args)

        klass = get_subclass(class_name)

        if klass

          klass.new(*args)

        end

      end

    end

  end

end