From d1d834820ddaba4fa31e6ab6d07a96ac7cc6d999 Mon Sep 17 00:00:00 2001
From: serge <saleyn@gmail.com>
Date: Thu, 10 Jan 2013 09:07:38 -0500
Subject: Add application:get_key/3

The new function provides a default value for a configuration
parameter.
---
 lib/kernel/src/application.erl | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

(limited to 'lib/kernel/src')

diff --git a/lib/kernel/src/application.erl b/lib/kernel/src/application.erl
index 9b7c4aa7b8..4e65883be7 100644
--- a/lib/kernel/src/application.erl
+++ b/lib/kernel/src/application.erl
@@ -23,7 +23,7 @@
 	 which_applications/0, which_applications/1,
 	 loaded_applications/0, permit/2]).
 -export([set_env/3, set_env/4, unset_env/2, unset_env/3]).
--export([get_env/1, get_env/2, get_all_env/0, get_all_env/1]).
+-export([get_env/1, get_env/2, get_env/3, get_all_env/0, get_all_env/1]).
 -export([get_key/1, get_key/2, get_all_key/0, get_all_key/1]).
 -export([get_application/0, get_application/1, info/0]).
 -export([start_type/0]).
@@ -264,6 +264,20 @@ get_env(Key) ->
 get_env(Application, Key) -> 
     application_controller:get_env(Application, Key).
 
+-spec get_env(Application, Par, Def) -> Val when
+      Application :: atom(),
+      Par :: atom(),
+      Def :: term(),
+      Val :: term().
+
+get_env(Application, Key, Def) ->
+    case get_env(Application, Key) of
+    {ok, Val} ->
+        Val;
+    undefined ->
+        Def
+    end.
+
 -spec get_all_env() -> Env when
       Env :: [{Par :: atom(), Val :: term()}].
 
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