gistfile1.rb

module Sunspot
  module Search

    class PaginatedCollection
      instance_methods.each { |m| undef_method m unless m =~ /^__|instance_eval|object_id/ }

      attr_reader :current_page, :per_page
      attr_accessor :total_count
      alias :total_entries :total_count
      alias :total_entries= :total_count=
      alias :limit_value :per_page

      def initialize(collection, page, per_page, total)
        @collection   = collection
        @current_page = page
        @per_page     = per_page
        @total_count  = total
      end

      def total_pages
        (total_count.to_f / per_page).ceil
      end
      alias :num_pages :total_pages

      def first_page?
        current_page == 1
      end

      def last_page?
        current_page >= total_pages
      end

      def previous_page
        current_page > 1 ? (current_page - 1) : nil
      end

      def next_page
        current_page < total_pages ? (current_page + 1) : nil
      end

      def out_of_bounds?
        current_page > total_pages
      end

      def offset
        (current_page - 1) * per_page
      end

      private

      def method_missing(method, *args, &block)
        @collection.send(method, *args, &block)
      end

      def respond_to?(*args)
        super || @collection.respond_to?(*args)
      end
      
    end
  end
end