| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. 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, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.jclouds.location.suppliers; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkNotNull; |
| 22 | import static com.google.common.collect.Iterables.getOnlyElement; |
| 23 | |
| 24 | import java.util.NoSuchElementException; |
| 25 | import java.util.Set; |
| 26 | |
| 27 | import javax.inject.Inject; |
| 28 | import javax.inject.Singleton; |
| 29 | |
| 30 | import org.jclouds.collect.Memoized; |
| 31 | import org.jclouds.domain.Location; |
| 32 | import org.jclouds.domain.LocationScope; |
| 33 | import org.jclouds.location.Region; |
| 34 | |
| 35 | import com.google.common.base.Predicate; |
| 36 | import com.google.common.base.Supplier; |
| 37 | import com.google.common.collect.Iterables; |
| 38 | import com.google.inject.Injector; |
| 39 | import com.google.inject.Key; |
| 40 | |
| 41 | /** |
| 42 | * @author Adrian Cole |
| 43 | */ |
| 44 | @Singleton |
| 45 | public class OnlyLocationOrFirstZoneOrRegionMatchingRegionId implements Supplier<Location> { |
| 46 | @Singleton |
| 47 | public static final class IsRegionAndIdEqualsOrIsZoneParentIdEquals implements Predicate<Location> { |
| 48 | |
| 49 | private final String region; |
| 50 | |
| 51 | @Inject |
| 52 | IsRegionAndIdEqualsOrIsZoneParentIdEquals(@Region String region) { |
| 53 | this.region = checkNotNull(region, "region"); |
| 54 | } |
| 55 | |
| 56 | @Override |
| 57 | public boolean apply(Location input) { |
| 58 | switch (input.getScope()) { |
| 59 | case ZONE: |
| 60 | return input.getParent().getId().equals(region); |
| 61 | case REGION: |
| 62 | return input.getId().equals(region); |
| 63 | default: |
| 64 | return false; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | @Override |
| 69 | public String toString() { |
| 70 | return "isRegionAndIdEqualsOrIsZoneParentIdEquals(" + region + ")"; |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | private final Injector injector; |
| 75 | private final Supplier<Set<? extends Location>> locationsSupplier; |
| 76 | |
| 77 | @Inject |
| 78 | OnlyLocationOrFirstZoneOrRegionMatchingRegionId(Injector injector, |
| 79 | @Memoized Supplier<Set<? extends Location>> locationsSupplier) { |
| 80 | this.injector = checkNotNull(injector, "injector"); |
| 81 | this.locationsSupplier = checkNotNull(locationsSupplier, "locationsSupplier"); |
| 82 | } |
| 83 | |
| 84 | @Override |
| 85 | @Singleton |
| 86 | public Location get() { |
| 87 | Set<? extends Location> locations = locationsSupplier.get(); |
| 88 | if (locationsSupplier.get().size() == 1) |
| 89 | return getOnlyElement(locationsSupplier.get()); |
| 90 | IsRegionAndIdEqualsOrIsZoneParentIdEquals matcher = null; |
| 91 | try { |
| 92 | String region = injector.getInstance(Key.get(String.class, Region.class)); |
| 93 | if (region == null) |
| 94 | return Iterables.get(locationsSupplier.get(), 0); |
| 95 | matcher = injector.getInstance(IsRegionAndIdEqualsOrIsZoneParentIdEquals.class); |
| 96 | Location toReturn = Iterables.find(locations, matcher); |
| 97 | return toReturn.getScope() == LocationScope.REGION ? toReturn : toReturn.getParent(); |
| 98 | } catch (NoSuchElementException e) { |
| 99 | throw new IllegalStateException(String.format("region %s not found in %s", matcher, locations)); |
| 100 | } |
| 101 | } |
| 102 | } |