Lua面线对象学习

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local userdata = {}
local Register = {}

function Register:del(key)
    userdata[self.namespace][key] = nil
end

function Register:get(key)
    if userdata[self.namespace][key] ~= nil then
        return userdata[self.namespace][key]
    else
        return false
    end
end

function Register:set(key, value)
    userdata[self.namespace][key] = value
    return true
end

function Register:new()
    if namespace == nil then
        namespace = 'default'
    end
    if userdata[namespace] == nil then
        userdata[namespace] = {}
    end
    local instance = {
        namespace = namespace,
        del = self.del,
        get = self.get,
        set = self.set
    }
    setmetatable(instance, Register)
    return instance
end

function Register:__newindex(key, value)
    if key ~= nil and value ~= nil then
        userdata[self.namespace][key] = value
    end
end

function Register:__index(index)
    local out = rawget(userdata[self.namespace], index)
    if out then
        return out
    else
        return false
    end
end

return Register