| 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.location.suppliers; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkNotNull; |
| 22 | import static com.google.common.collect.Iterables.find; |
| 23 | import static com.google.common.collect.Iterables.getOnlyElement; |
| 24 | |
| 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 | |
| 34 | import com.google.common.base.Predicate; |
| 35 | import com.google.common.base.Supplier; |
| 36 | |
| 37 | /** |
| 38 | * |
| 39 | * @author Adrian Cole |
| 40 | * |
| 41 | */ |
| 42 | @Singleton |
| 43 | public class OnlyLocationOrFirstZone implements Supplier<Location> { |
| 44 | @Singleton |
| 45 | public static final class IsZone implements Predicate<Location> { |
| 46 | @Override |
| 47 | public boolean apply(Location input) { |
| 48 | return input.getScope() == LocationScope.ZONE; |
| 49 | } |
| 50 | |
| 51 | @Override |
| 52 | public String toString() { |
| 53 | return "isZone()"; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | private final Supplier<Set<? extends Location>> locationsSupplier; |
| 58 | private final IsZone isZone; |
| 59 | |
| 60 | @Inject |
| 61 | OnlyLocationOrFirstZone(@Memoized Supplier<Set<? extends Location>> locationsSupplier, IsZone isZone) { |
| 62 | this.locationsSupplier = checkNotNull(locationsSupplier, "locationsSupplierSupplier"); |
| 63 | this.isZone = checkNotNull(isZone, "isZone"); |
| 64 | } |
| 65 | |
| 66 | @Override |
| 67 | public Location get() { |
| 68 | if (locationsSupplier.get().size() == 1) |
| 69 | return getOnlyElement(locationsSupplier.get()); |
| 70 | return find(locationsSupplier.get(), isZone); |
| 71 | } |
| 72 | |
| 73 | } |