local M = class("Groups") 

function M:ctor()
	self.groupList = {}
	self.groupMap = {}
end

function M:add(group)
	local _tem = self.groupMap[group.id]
	if _tem then
		for k, v in pairs(group) do
	        _tem[k] = v
	    end
	else
		self.groupMap[group.id] = group
		self.groupList[#self.groupList + 1] = group
	end
end

function M:del(id)
	local _tem = self.groupMap[id]
	if _tem then
		local list = self.groupList
		self.groupMap[id] = nil
		for i=1,#list do
			local group = list[i] 
			if group.id == id then
				table.remove(list,i)
				self.groupMap[id] = nil
				break
			end
		end
	end
end

function M:get(id)
	local _tem = self.groupMap[id]
	return _tem
end

function M:clear()
	self.groupMap = {}
	self.groupList = {}
end

return M