| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.util; |
| 20 | |
| 21 | import static com.google.common.base.Predicates.instanceOf; |
| 22 | import static com.google.common.base.Throwables.getCausalChain; |
| 23 | import static com.google.common.base.Throwables.propagate; |
| 24 | import static com.google.common.collect.Iterables.find; |
| 25 | |
| 26 | import java.util.NoSuchElementException; |
| 27 | |
| 28 | import org.jclouds.http.HttpResponseException; |
| 29 | import org.jclouds.rest.AuthorizationException; |
| 30 | import org.jclouds.rest.InsufficientResourcesException; |
| 31 | import org.jclouds.rest.ResourceNotFoundException; |
| 32 | |
| 33 | import com.google.common.base.Throwables; |
| 34 | import com.google.inject.ProvisionException; |
| 35 | import com.google.inject.spi.Message; |
| 36 | |
| 37 | /** |
| 38 | * General utilities used in jclouds code. |
| 39 | * |
| 40 | * @author Adrian Cole |
| 41 | */ |
| 42 | public class Throwables2 { |
| 43 | |
| 44 | @SuppressWarnings("unchecked") |
| 45 | public static <T extends Throwable> T getFirstThrowableOfType(Throwable from, Class<T> clazz) { |
| 46 | if (from instanceof ProvisionException) |
| 47 | return getFirstThrowableOfType(ProvisionException.class.cast(from), clazz); |
| 48 | try { |
| 49 | return (T) find(getCausalChain(from), instanceOf(clazz)); |
| 50 | } catch (NoSuchElementException e) { |
| 51 | return null; |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | public static <T extends Throwable> T getFirstThrowableOfType(ProvisionException e, Class<T> clazz) { |
| 56 | for (Message message : e.getErrorMessages()) { |
| 57 | if (message.getCause() != null) { |
| 58 | T cause = getFirstThrowableOfType(message.getCause(), clazz); |
| 59 | if (cause instanceof ProvisionException) |
| 60 | return getFirstThrowableOfType(ProvisionException.class.cast(cause), clazz); |
| 61 | return cause; |
| 62 | } |
| 63 | } |
| 64 | return null; |
| 65 | } |
| 66 | |
| 67 | public static <T> T propagateOrNull(Exception from) { |
| 68 | propagate(from); |
| 69 | assert false : "exception should have propogated"; |
| 70 | return null; |
| 71 | } |
| 72 | |
| 73 | // Note this needs to be kept up-to-date with all top-level exceptions jclouds works against |
| 74 | @SuppressWarnings( { "unchecked", "rawtypes" }) |
| 75 | public static Exception returnFirstExceptionIfInListOrThrowStandardExceptionOrCause(Class[] exceptionTypes, |
| 76 | Exception exception) throws Exception { |
| 77 | for (Class type : exceptionTypes) { |
| 78 | Throwable throwable = getFirstThrowableOfType(exception, type); |
| 79 | if (throwable != null) { |
| 80 | return (Exception) throwable; |
| 81 | } |
| 82 | } |
| 83 | for (Class<Exception> propagatableExceptionType : new Class[] { IllegalStateException.class, |
| 84 | UnsupportedOperationException.class, IllegalArgumentException.class, AuthorizationException.class, |
| 85 | ResourceNotFoundException.class, InsufficientResourcesException.class, HttpResponseException.class }) { |
| 86 | Throwable throwable = getFirstThrowableOfType(exception, propagatableExceptionType); |
| 87 | if (throwable != null) { |
| 88 | throw (Exception) throwable; |
| 89 | } |
| 90 | } |
| 91 | Throwables.throwCause(exception, true); |
| 92 | return exception; |
| 93 | } |
| 94 | |
| 95 | public static <T> T propagateAuthorizationOrOriginalException(Exception e) { |
| 96 | AuthorizationException aex = getFirstThrowableOfType(e, AuthorizationException.class); |
| 97 | if (aex != null) |
| 98 | throw aex; |
| 99 | propagate(e); |
| 100 | assert false : "exception should have propogated " + e; |
| 101 | return null; |
| 102 | } |
| 103 | |
| 104 | } |