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Subject: svn commit: r1428642 -
 /openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ExceptionUtil.java
Date: Thu, 03 Jan 2013 22:20:05 -0000
To: commits@openwebbeans.apache.org
From: gpetracek@apache.org
Message-Id: <20130103222005.4B85C238896F@eris.apache.org>

Author: gpetracek
Date: Thu Jan  3 22:20:04 2013
New Revision: 1428642

URL: http://svn.apache.org/viewvc?rev=1428642&view=rev
Log:
OWB-344 ExceptionUtil for easier handling of exceptions

Added:
    openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ExceptionUtil.java

Added: openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ExceptionUtil.java
URL: http://svn.apache.org/viewvc/openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ExceptionUtil.java?rev=1428642&view=auto
==============================================================================
--- openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ExceptionUtil.java (added)
+++ openwebbeans/trunk/webbeans-impl/src/main/java/org/apache/webbeans/util/ExceptionUtil.java Thu Jan  3 22:20:04 2013
@@ -0,0 +1,63 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * 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.
+ */
+package org.apache.webbeans.util;
+
+public abstract class ExceptionUtil
+{
+    private ExceptionUtil()
+    {
+        // prevent instantiation
+    }
+
+    public static RuntimeException throwAsRuntimeException(Throwable throwable)
+    {
+        //Attention: helper which allows to use a trick to throw
+        // a catched checked exception without a wrapping exception
+        new ExceptionHelper<RuntimeException>().throwException(throwable);
+        return null; //not needed due to the helper trick, but it's easier for using it
+    }
+
+    @SuppressWarnings({ "unchecked" })
+    private static class ExceptionHelper<T extends Throwable>
+    {
+        private void throwException(Throwable exception) throws T
+        {
+            try
+            {
+                //exception-type is only checked at compile-time
+                throw (T) exception;
+            }
+            catch (ClassCastException e)
+            {
+                //doesn't happen with existing JVMs! - if that changes the local ClassCastException needs to be ignored
+                //-> throw original exception
+                if (e.getStackTrace()[0].toString().contains(getClass().getName()))
+                {
+                    if (exception instanceof RuntimeException)
+                    {
+                        throw (RuntimeException) exception;
+                    }
+                    throw new RuntimeException(exception);
+                }
+                //if the exception to throw is a ClassCastException, throw it
+                throw e;
+            }
+        }
+    }
+}