# * George Moschovitis  <gm@navel.gr>
# (c) 2004-2005 Navel, all rights reserved.
# $Id: fragments.rb 326 2005-03-28 11:07:17Z gmosx $

require 'fileutils'

require 'glue/attribute'
require 'nitro/caching/stores'

module N

# Adds support for caching.

module Caching

	# Action caching.

	module Fragments

		@@store = FileStore.new # MemoryStore.new

		def self.store 
			@@store 
		end
		
		def self.store=(store) 
			@@store = store
		end
		
		def self.get(name, options = {})
			return @@store.read(name, options)
		end
		
		def self.put(name, content = nil, options = {})
			@@store.write(name, content, options)
			return content
		end
		
		def self.append_features(base) # :nodoc: 
			super
		end

		private

		def cache(name = nil, options = {}, &block)
			name = @action_name unless name	
			cache_fragment(block, "#{name}#{options}", options)
		end

		def cache_fragment(block, name, options = {})
			unless caching_enabled
				block.call
				return
			end

			if fragment = Fragments.get(name, options)
				@out << fragment
			else
				pos = @out.length				
				block.call
				Fragments.put(name, @out[pos..-1], options)
			end
		end

		def expire_fragment(name, options = {})
			Fragments.store.delete(name, options)
		end
	end
	
end

end