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--------------------------------------------------------------------------------

---------------------- ## ##### ##### ###### -----------------------

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---------------------- ## ## ## ## ## ###### -----------------------

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---------------------- -----------------------

----------------------- Lua Object-Oriented Programming ------------------------

--------------------------------------------------------------------------------

-- Project: LOOP Class Library --

-- Release: 2.3 beta --

-- Title : Cache of Objects Created on Demand --

-- Author : Renato Maia <maia@inf.puc-rio.br> --

--------------------------------------------------------------------------------

-- Notes: --

-- Storage of keys 'retrieve' and 'default' are not allowed. --

--------------------------------------------------------------------------------

local rawget = rawget

local rawset = rawset

local oo = require "loop.base"

module("loop.collection.ObjectCache", oo.class)

__mode = "k"

function __index(self, key)

if key ~= nil then

local value = rawget(self, "retrieve")

if value then

value = value(self, key)

else

value = rawget(self, "default")

end

rawset(self, key, value)

return value

end

end