module ETL #:nodoc:
  module Control #:nodoc:
    class Destination
      attr_reader :control, :configuration, :mapping
      attr_accessor :buffer_size, :current_row
      
      class << self
        def class_for_name(name)
          ETL::Control.const_get("#{name.to_s.classify}Destination")
        end
      end
      
      def initialize(control, configuration, mapping)
        @control = control
        @configuration = configuration
        @mapping = mapping
        @buffer_size = configuration[:buffer_size] ||= 1000
      end
      
      def current_row
        @current_row ||= 1
      end
      
      def write(row)
        buffer << row
        flush if buffer.length >= buffer_size
      end
      
      # Abstract method
      def flush
        raise NotImplementedError, "flush method must be implemented by subclasses"
      end
      
      # Abstract method
      def close
        raise NotImplementedError, "close method must be implemented by subclasses"
      end
      
      protected
      def buffer
        @buffer ||= []
      end
      
      def generators
        @generators ||= {}
      end
      
      # Get the order of elements from the source order
      def order_from_source
        order = []
        control.sources.first.definition.each do |item|
          case item
          when Hash
            order << item[:name]
          else
            order << item
          end
        end
        order
      end
    end
  end
end

Dir[File.dirname(__FILE__) + "/destination/*.rb"].each { |file| require(file) }