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#
# lkn.core: an entity-component-system (ecs) implementation for lyxan
# Copyright (C) 2017 Thomas Letan <contact@thomasletan.fr>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
defmodule Lkn.Core.Properties do
use Lkn.Prelude
@moduledoc false
@spec start_link(map, Lkn.Core.Entity.k) :: Agent.on_start
def start_link(content, entity_key) do
Agent.start_link(fn -> content end, name: Lkn.Core.Name.properties(entity_key))
end
@spec read(Lkn.Core.Entity.k, Lkn.Core.Entity.prop) :: Option.t(Lkn.Core.Entity.value)
def read(entity_key, prop) do
case Agent.get(Lkn.Core.Name.properties(entity_key), &Map.fetch(&1, prop)) do
{:ok, val} -> Option.some(val)
:error -> Option.nothing()
end
end
@spec write(Lkn.Core.Entity.k, Lkn.Core.Entity.prop, Lkn.Core.Entity.value) :: :ok
def write(entity_key, prop, v) do
Agent.update(Lkn.Core.Name.properties(entity_key), &Map.put(&1, prop, v))
end
end
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