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--[[
Copyright (c) 2012-2015 Kaarle Ritvanen
See LICENSE file for license details
--]]
--- @module aconf.model
local M = {}
local TreeNode = require('aconf.model.field').TreeNode
local node = require('aconf.model.node')
local object = require('aconf.object')
local pth = require('aconf.path')
local util = require('aconf.util')
--- set object, inherits @{node.List}. An instance of this class represents
-- a set object in the data model, in the context of a specific
-- transaction. A set is an unordered collection of primitive
-- values. Members can be inserted to the set using
-- @{node.insert}. Members can be removed by assigning the nil value
-- to the key to be removed.
-- @klass node.Set
M.Set = object.class(require('aconf.model.node').List)
function M.Set:init(context, params)
assert(not object.isinstance(params.field, TreeNode))
params.field.dereference = false
params.dtype = 'set'
object.super(self, M.Set):init(context, params)
local function find(value)
value = node.BoundMember(
self, pth.wildcard, params.field
):normalize(value)
for i, member in pairs(self) do
if member == value then return i, value end
end
end
local mt = getmetatable(self)
function mt.get(k, options)
options = util.setdefaults(options, {dereference=true})
local i, v = find(k)
if i then return mt.load(i, options) end
if options.create then return v end
end
function mt.__newindex(t, k, v)
assert(v == nil)
local i = find(k)
if not i then return end
mt.save(i, nil)
end
--- determines if the given set contains the given value.
-- @function node.contains
-- @tparam node.Set set set
-- @tparam primitive v value
-- @treturn boolean true if the set contains the value
function mt.contains(v) return find(v) and true or false end
local insert = mt.insert
function mt.insert(v) if not mt.contains(v) then insert(v) end end
local meta = mt.meta
function mt.meta()
local res = meta()
res.removable = util.map(mt.load, res.removable)
return res
end
end
return M
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