| /** |
| * Copyright (C) 2010 Google Inc. |
| * |
| * Licensed 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 com.google.inject.internal; |
| |
| |
| /** |
| * Rethrows user-code exceptions in wrapped exceptions so that Errors can target the correct |
| * exception. |
| * |
| * @author sameb@google.com (Sam Berlin) |
| */ |
| class Exceptions { |
| |
| /** |
| * Rethrows the exception (or it's cause, if it has one) directly if possible. |
| * If it was a checked exception, this wraps the exception in a stack trace |
| * with no frames, so that the exception is shown immediately with no frames |
| * above it. |
| */ |
| public static RuntimeException rethrowCause(Throwable throwable) { |
| Throwable cause = throwable; |
| if(cause.getCause() != null) { |
| cause = cause.getCause(); |
| } |
| return rethrow(cause); |
| } |
| |
| /** Rethrows the exception. */ |
| public static RuntimeException rethrow(Throwable throwable) { |
| if(throwable instanceof RuntimeException) { |
| throw (RuntimeException)throwable; |
| } else if(throwable instanceof Error) { |
| throw (Error)throwable; |
| } else { |
| throw new UnhandledCheckedUserException(throwable); |
| } |
| } |
| |
| /** |
| * A marker exception class that we look for in order to unwrap the exception |
| * into the user exception, to provide a cleaner stack trace. |
| */ |
| static class UnhandledCheckedUserException extends RuntimeException { |
| public UnhandledCheckedUserException(Throwable cause) { |
| super(cause); |
| } |
| } |
| } |