Define base error class for errors in Droonga

lib/droonga/catalog.rb

@@ -16,12 +16,13 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 require "droonga/catalog_loader"
+require "droonga/error"
 
 module Droonga
   class << self
     attr_accessor :catalog
   end
 
-  class InvalidCatalog < StandardError
+  class InvalidCatalog < Error
   end
 end

lib/droonga/error.rb

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2014 Droonga Project
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License version 2.1 as published by the Free Software Foundation.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+module Droonga
+  class Error < StandardError
+  end
+end

lib/droonga/message_processing_error.rb

@@ -1,4 +1,4 @@
-# Copyright (C) 2013 Droonga Project
+# Copyright (C) 2013-2014 Droonga Project
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -13,8 +13,10 @@
 # License along with this library; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
+require "droonga/error"
+
 module Droonga
-  class MessageProcessingError < StandardError
+  class MessageProcessingError < Error
     STATUS_CODE = 500
 
     attr_reader :message, :detail