| /* |
| * 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.jclouds; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Predicates.equalTo; |
| import static com.google.common.base.Predicates.in; |
| import static com.google.common.base.Throwables.propagate; |
| import static com.google.common.primitives.Ints.asList; |
| import static org.jclouds.http.HttpUtils.contains404; |
| import static org.jclouds.http.HttpUtils.returnValueOnCodeOrNull; |
| import static org.jclouds.util.Throwables2.getFirstThrowableOfType; |
| |
| import org.jclouds.collect.IterableWithMarker; |
| import org.jclouds.collect.IterableWithMarkers; |
| import org.jclouds.collect.PagedIterable; |
| import org.jclouds.collect.PagedIterables; |
| import org.jclouds.rest.ResourceNotFoundException; |
| |
| import com.google.common.base.Optional; |
| import com.google.common.collect.FluentIterable; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.ImmutableMultimap; |
| import com.google.common.collect.ImmutableSet; |
| |
| public final class Fallbacks { |
| private Fallbacks() { |
| } |
| |
| public static final class NullOnNotFoundOr404 implements Fallback<Object> { |
| public Object createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(null, checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class VoidOnNotFoundOr404 implements Fallback<Void> { |
| public Void createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(null, checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class TrueOnNotFoundOr404 implements Fallback<Boolean> { |
| public Boolean createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(true, checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class FalseOnNotFoundOr404 implements Fallback<Boolean> { |
| public Boolean createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(false, checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class FalseOnNotFoundOr422 implements Fallback<Boolean> { |
| public Boolean createOrPropagate(Throwable t) throws Exception { |
| if (containsResourceNotFoundException(checkNotNull(t, "throwable")) |
| || returnValueOnCodeOrNull(t, true, equalTo(422)) != null) |
| return false; |
| throw propagate(t); |
| } |
| } |
| |
| /** |
| */ |
| public static final class AbsentOn403Or404Or500 implements Fallback<Optional<Object>> { |
| public Optional<Object> createOrPropagate(Throwable t) throws Exception { |
| Boolean returnVal = returnValueOnCodeOrNull(checkNotNull(t, "throwable"), true, in(asList(403, 404, 500))); |
| if (returnVal != null) |
| return Optional.absent(); |
| throw propagate(t); |
| } |
| } |
| |
| public static final class EmptyFluentIterableOnNotFoundOr404 implements Fallback<FluentIterable<Object>> { |
| public FluentIterable<Object> createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(FluentIterable.from(ImmutableSet.of()), checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class EmptyIterableWithMarkerOnNotFoundOr404 implements Fallback<IterableWithMarker<Object>> { |
| public IterableWithMarker<Object> createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(IterableWithMarkers.from(ImmutableSet.of()), checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class EmptyPagedIterableOnNotFoundOr404 implements Fallback<PagedIterable<Object>> { |
| public PagedIterable<Object> createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(PagedIterables.of(IterableWithMarkers.from(ImmutableSet.of())), |
| checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class EmptyListOnNotFoundOr404 implements Fallback<ImmutableList<Object>> { // NO_UCD |
| public ImmutableList<Object> createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(ImmutableList.of(), checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class EmptySetOnNotFoundOr404 implements Fallback<ImmutableSet<Object>> { |
| public ImmutableSet<Object> createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(ImmutableSet.of(), checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class EmptyMapOnNotFoundOr404 implements Fallback<ImmutableMap<Object, Object>> { |
| public ImmutableMap<Object, Object> createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(ImmutableMap.of(), checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static final class EmptyMultimapOnNotFoundOr404 implements Fallback<ImmutableMultimap<Object, Object>> { // NO_UCD |
| public ImmutableMultimap<Object, Object> createOrPropagate(Throwable t) throws Exception { |
| return valOnNotFoundOr404(ImmutableMultimap.of(), checkNotNull(t, "throwable")); |
| } |
| } |
| |
| public static <T> T valOnNotFoundOr404(T val, Throwable t) { |
| if (containsResourceNotFoundException(checkNotNull(t, "throwable")) || contains404(t)) |
| return val; |
| throw propagate(t); |
| } |
| |
| private static boolean containsResourceNotFoundException(Throwable from) { |
| return getFirstThrowableOfType(from, ResourceNotFoundException.class) != null; |
| } |
| |
| } |