Introduce error tags

The rationale is:
- To have a centralized view of what error conditions can appear in
	Aquarium.
- To use consistent error descriptions, in case where an error condition
	applies to more than one place.

	This is of course an initial approach. Let's see how it goes.

diff --git a/src/main/scala/gr/grnet/aquarium/ErrorTags.scala b/src/main/scala/gr/grnet/aquarium/ErrorTags.scala
new file mode 100644 (file)
index 0000000..2de1177
--- /dev/null
+++ b/src/main/scala/gr/grnet/aquarium/ErrorTags.scala
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2011-2012 GRNET S.A. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials
+ *      provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and
+ * documentation are those of the authors and should not be
+ * interpreted as representing official policies, either expressed
+ * or implied, of GRNET S.A.
+ */
+
+package gr.grnet.aquarium
+
+/**
+ * Describe all possible error tags.
+ *
+ * @author Christos KK Loverdos <loverdos@gmail.com>
+ */
+
+final object ErrorTags {
+  final case class tag private[ErrorTags](app: String, group: String, number: String) {
+    @inline
+    def message(fmt: String, args: Any*) = {
+      "[%s_%s_%s]".format(app, group, number) + fmt.format(args:_*)
+    }
+  }
+
+  private[ErrorTags] final object Apps {
+    private[ErrorTags] final val AQU = "AQU"
+  }
+
+  private[ErrorTags] final object Groups {
+    final val BAL = "BAL"
+  }
+
+  import Apps.AQU
+  import Groups.BAL
+
+  private[ErrorTags] implicit def tuple3ToTag(agn: (String, String, String)) = tag(agn._1, agn._2, agn._3)
+
+  // Errors related to REST API: GetUserBalance
+  final val AQU_BAL_001 = (AQU, BAL, "001")
+  final val AQU_BAL_002 = (AQU, BAL, "002")
+  final val AQU_BAL_003 = (AQU, BAL, "003")
+  final val AQU_BAL_004 = (AQU, BAL, "004")
+  final val AQU_BAL_005 = (AQU, BAL, "005")
+  final val AQU_BAL_006 = (AQU, BAL, "006")
+}