/*
* 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);
}
}
}