From efbdfbe117939cd50d0252a210b9b7634de42bb4 Mon Sep 17 00:00:00 2001
From: Eric <ericbmerritt@gmail.com>
Date: Thu, 9 May 2013 17:04:18 -0700
Subject: Basic file rename from rcl to rlx

---
 src/rlx_provider.erl | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 src/rlx_provider.erl

(limited to 'src/rlx_provider.erl')

diff --git a/src/rlx_provider.erl b/src/rlx_provider.erl
new file mode 100644
index 0000000..4d8f044
--- /dev/null
+++ b/src/rlx_provider.erl
@@ -0,0 +1,117 @@
+%% -*- erlang-indent-level: 4; indent-tabs-mode: nil; fill-column: 80 -*-
+%%% Copyright 2012 Erlware, LLC. All Rights Reserved.
+%%%
+%%% This file is provided to you under the Apache License,
+%%% Version 2.0 (the "License"); you may not use this file
+%%% except in compliance with the License.  You may obtain
+%%% a copy of the License at
+%%%
+%%%   http://www.apache.org/licenses/LICENSE-2.0
+%%%
+%%% Unless required by applicable law or agreed to in writing,
+%%% software distributed under the License is distributed on an
+%%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+%%% KIND, either express or implied.  See the License for the
+%%% specific language governing permissions and limitations
+%%% under the License.
+%%%-------------------------------------------------------------------
+%%% @author Eric Merritt <ericbmerritt@gmail.com>
+%%% @copyright 2011 Erlware, LLC.
+%%% @doc
+%%%  A module that supports providing state manipulation services to the system.
+%%% @end
+%%%-------------------------------------------------------------------
+-module(rcl_provider).
+
+%% API
+-export([new/2,
+         do/2,
+         impl/1,
+         format_error/1,
+         format_error/2,
+         format/1]).
+
+-export_type([t/0]).
+
+-include_lib("relcool/include/relcool.hrl").
+
+%%%===================================================================
+%%% Types
+%%%===================================================================
+
+-opaque t() :: {?MODULE, module()}.
+
+
+-ifdef(have_callback_support).
+
+-callback init(rcl_state:t()) -> {ok, rcl_state:t()} | relcool:error().
+-callback do(rcl_state:t()) ->  {ok, rcl_state:t()} | relcool:error().
+-callback format_error(Reason::term()) -> iolist().
+
+-else.
+
+%% In the case where R14 or lower is being used to compile the system
+%% we need to export a behaviour info
+-export([behaviour_info/1]).
+-spec behaviour_info(atom()) -> [{atom(), arity()}] | undefined.
+behaviour_info(callbacks) ->
+    [{init, 1},
+     {do, 1},
+     {format_error, 1}];
+behaviour_info(_) ->
+    undefined.
+
+-endif.
+
+%%%===================================================================
+%%% API
+%%%===================================================================
+
+%% @doc create a new provider object from the specified module. The
+%% module should implement the provider behaviour.
+%%
+%% @param ModuleName The module name.
+%% @param State0 The current state of the system
+-spec new(module(), rcl_state:t()) ->
+                 {t(), {ok, rcl_state:t()}} | relcool:error().
+new(ModuleName, State0) when is_atom(ModuleName) ->
+    State1 = ModuleName:init(State0),
+    case code:which(ModuleName) of
+        non_existing ->
+            ?RCL_ERROR({non_existing, ModuleName});
+        _ ->
+            {{?MODULE, ModuleName}, State1}
+    end.
+
+%% @doc Manipulate the state of the system, that new state
+%%
+%% @param Provider the provider object
+%% @param State the current state of the system
+-spec do(Provider::t(), rcl_state:t()) ->
+                {ok, rcl_state:t()} | relcool:error().
+do({?MODULE, Mod}, State) ->
+    Mod:do(State).
+
+%%% @doc get the name of the module that implements the provider
+%%% @param Provider the provider object
+-spec impl(Provider::t()) -> module().
+impl({?MODULE, Mod}) ->
+    Mod.
+
+%% @doc format an error produced from a provider.
+-spec format_error(Reason::term()) -> iolist().
+format_error({non_existing, ModuleName}) ->
+    io_lib:format("~p does not exist in the system", [ModuleName]).
+
+%% @doc format an error produced from a provider.
+-spec format_error(t(), Reason::term()) -> iolist().
+format_error({?MODULE, Mod}, Error) ->
+    Mod:format_error(Error).
+
+%% @doc print the provider module name
+%%
+%% @param T - The provider
+%% @return An iolist describing the provider
+-spec format(t()) -> iolist().
+format({?MODULE, Mod}) ->
+    erlang:atom_to_list(Mod).
-- 
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