added strict suppliers of scoped locations

core/src/main/java/org/jclouds/location/suppliers/all/RegionToProvider.java

@@ -0,0 +1,77 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.location.suppliers.all;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
+
+import java.util.Map;
+import java.util.Set;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import org.jclouds.domain.Location;
+import org.jclouds.domain.LocationBuilder;
+import org.jclouds.domain.LocationScope;
+import org.jclouds.location.Iso3166;
+import org.jclouds.location.Region;
+import org.jclouds.location.suppliers.LocationsSupplier;
+
+import com.google.common.base.Supplier;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.ImmutableSet.Builder;
+import com.google.common.collect.Iterables;
+
+/**
+ * 
+ * @author Adrian Cole
+ */
+@Singleton
+public class RegionToProvider implements LocationsSupplier {
+   private final JustProvider justProvider;
+   private final Supplier<Set<String>> regionsSupplier;
+   private final Supplier<Map<String, Supplier<Set<String>>>> isoCodesByIdSupplier;
+
+   @Inject
+   public RegionToProvider(JustProvider justProvider, @Region Supplier<Set<String>> regionsSupplier,
+            @Iso3166 Supplier<Map<String, Supplier<Set<String>>>> isoCodesByIdSupplier) {
+      this.justProvider = checkNotNull(justProvider, "justProvider");
+      this.regionsSupplier = checkNotNull(regionsSupplier, "regionsSupplier");
+      this.isoCodesByIdSupplier = checkNotNull(isoCodesByIdSupplier, "isoCodesByIdSupplier");
+   }
+
+   @Override
+   public Set<? extends Location> get() {
+      Builder<Location> locations = ImmutableSet.builder();
+      Location provider = Iterables.getOnlyElement(justProvider.get());
+      Set<String> regions = regionsSupplier.get();
+      checkState(regions.size() > 0, "no regions found for provider %s, using supplier %s", provider, regionsSupplier);
+      Map<String, Supplier<Set<String>>> isoCodesById = isoCodesByIdSupplier.get();
+      for (String region : regions) {
+         LocationBuilder builder = new LocationBuilder().scope(LocationScope.REGION).id(region).description(region)
+                  .parent(provider);
+         if (isoCodesById.containsKey(region))
+            builder.iso3166Codes(isoCodesById.get(region).get());
+         locations.add(builder.build());
+      }
+      return locations.build();
+   }
+
+}

core/src/main/java/org/jclouds/location/suppliers/all/ZoneToProvider.java

@@ -0,0 +1,84 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.location.suppliers.all;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
+
+import java.util.Map;
+import java.util.Set;
+
+import javax.annotation.Resource;
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import org.jclouds.domain.Location;
+import org.jclouds.domain.LocationBuilder;
+import org.jclouds.domain.LocationScope;
+import org.jclouds.location.Iso3166;
+import org.jclouds.location.Zone;
+import org.jclouds.location.suppliers.LocationsSupplier;
+import org.jclouds.logging.Logger;
+
+import com.google.common.base.Supplier;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.ImmutableSet.Builder;
+import com.google.common.collect.Iterables;
+
+/**
+ * 
+ * @author Adrian Cole
+ */
+@Singleton
+public class ZoneToProvider implements LocationsSupplier {
+
+   @Resource
+   protected Logger logger = Logger.NULL;
+
+   private final JustProvider justProvider;
+   private final Supplier<Set<String>> zoneIdsSupplier;
+   private final Supplier<Map<String, Supplier<Set<String>>>> isoCodesByIdSupplier;
+
+   @Inject
+   ZoneToProvider(JustProvider justProvider, @Zone Supplier<Set<String>> zoneIdsSupplier,
+            @Iso3166 Supplier<Map<String, Supplier<Set<String>>>> isoCodesByIdSupplier) {
+      this.justProvider = checkNotNull(justProvider, "justProvider");
+      this.zoneIdsSupplier = checkNotNull(zoneIdsSupplier, "zoneIdsSupplier");
+      this.isoCodesByIdSupplier = checkNotNull(isoCodesByIdSupplier, "isoCodesByIdSupplier");
+   }
+
+   @Override
+   public Set<? extends Location> get() {
+      Location provider = Iterables.getOnlyElement(justProvider.get());
+      Set<String> zoneIds = zoneIdsSupplier.get();
+      checkState(zoneIds.size() > 0, "no zones found for provider %s, using supplier %s", provider, zoneIdsSupplier);
+      Map<String, Supplier<Set<String>>> isoCodesById = isoCodesByIdSupplier.get();
+
+      Builder<Location> locations = ImmutableSet.builder();
+      for (String zoneId : zoneIds) {
+         LocationBuilder builder = new LocationBuilder().scope(LocationScope.ZONE).id(zoneId).description(zoneId)
+                  .parent(provider);
+         if (isoCodesById.containsKey(zoneId))
+            builder.iso3166Codes(isoCodesById.get(zoneId).get());
+         locations.add(builder.build());
+      }
+      return locations.build();
+   }
+
+}

core/src/main/java/org/jclouds/location/suppliers/implicit/FirstRegion.java

@@ -0,0 +1,65 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.location.suppliers.implicit;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.collect.Iterables.find;
+import static com.google.common.collect.Iterables.transform;
+import static org.jclouds.location.predicates.LocationPredicates.isRegion;
+
+import java.util.NoSuchElementException;
+import java.util.Set;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import org.jclouds.collect.Memoized;
+import org.jclouds.domain.Location;
+import org.jclouds.location.functions.ToIdAndScope;
+import org.jclouds.location.suppliers.ImplicitLocationSupplier;
+
+import com.google.common.base.Supplier;
+
+/**
+ * 
+ * @author Adrian Cole
+ * 
+ */
+@Singleton
+public class FirstRegion implements ImplicitLocationSupplier {
+
+   private final Supplier<Set<? extends Location>> locationsSupplier;
+
+   @Inject
+   FirstRegion(@Memoized Supplier<Set<? extends Location>> locationsSupplier) {
+      this.locationsSupplier = checkNotNull(locationsSupplier, "locationsSupplierSupplier");
+   }
+
+   @Override
+   public Location get() {
+      Set<? extends Location> locations = locationsSupplier.get();
+      try {
+         return find(locations, isRegion());
+      } catch (NoSuchElementException e) {
+         throw new NoSuchElementException("none to of the locations are scope REGION: "
+               + transform(locations, ToIdAndScope.INSTANCE));
+      }
+   }
+
+}

core/src/main/java/org/jclouds/location/suppliers/implicit/FirstZone.java

@@ -0,0 +1,65 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.location.suppliers.implicit;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.collect.Iterables.find;
+import static com.google.common.collect.Iterables.transform;
+import static org.jclouds.location.predicates.LocationPredicates.isZone;
+
+import java.util.NoSuchElementException;
+import java.util.Set;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import org.jclouds.collect.Memoized;
+import org.jclouds.domain.Location;
+import org.jclouds.location.functions.ToIdAndScope;
+import org.jclouds.location.suppliers.ImplicitLocationSupplier;
+
+import com.google.common.base.Supplier;
+
+/**
+ * 
+ * @author Adrian Cole
+ * 
+ */
+@Singleton
+public class FirstZone implements ImplicitLocationSupplier {
+
+   private final Supplier<Set<? extends Location>> locationsSupplier;
+
+   @Inject
+   FirstZone(@Memoized Supplier<Set<? extends Location>> locationsSupplier) {
+      this.locationsSupplier = checkNotNull(locationsSupplier, "locationsSupplierSupplier");
+   }
+
+   @Override
+   public Location get() {
+      Set<? extends Location> locations = locationsSupplier.get();
+      try {
+         return find(locations, isZone());
+      } catch (NoSuchElementException e) {
+         throw new NoSuchElementException("none to of the locations are scope ZONE: "
+               + transform(locations, ToIdAndScope.INSTANCE));
+      }
+   }
+
+}

core/src/test/java/org/jclouds/location/suppliers/all/RegionToProviderTest.java

@@ -0,0 +1,72 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.location.suppliers.all;
+
+import static org.testng.Assert.assertEquals;
+
+import java.net.URI;
+import java.util.Map;
+import java.util.Set;
+
+import org.jclouds.domain.Location;
+import org.jclouds.domain.LocationBuilder;
+import org.jclouds.domain.LocationScope;
+import org.testng.annotations.Test;
+
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * 
+ * @author Adrian Cole
+ */
+@Test(groups = "unit", testName = "RegionToProviderTest")
+public class RegionToProviderTest {
+   Location provider = new LocationBuilder().scope(LocationScope.PROVIDER).id("servo").description("http://servo")
+            .iso3166Codes(ImmutableSet.of("US")).build();
+   JustProvider justProvider = new JustProvider("servo", Suppliers.ofInstance(URI.create("http://servo")), ImmutableSet.of("US"));
+
+   @Test
+   public void test() {
+      Supplier<Set<String>> regionIdsSupplier = Suppliers.<Set<String>>ofInstance(ImmutableSet.of("region1", "region2"));
+      Supplier<Map<String, Supplier<Set<String>>>> locationToIsoCodes = Suppliers.<Map<String, Supplier<Set<String>>>>ofInstance(
+               ImmutableMap.of(
+                        "servo", Suppliers.<Set<String>>ofInstance(ImmutableSet.of("US")),
+                        "region1", Suppliers.<Set<String>>ofInstance(ImmutableSet.of("US-CA")),
+                        "region2", Suppliers.<Set<String>>ofInstance(ImmutableSet.of("US-VA"))
+                        ));
+      RegionToProvider fn = new RegionToProvider(justProvider, regionIdsSupplier, locationToIsoCodes);
+      
+      assertEquals(fn.get(), ImmutableSet.of(
+               new LocationBuilder().scope(LocationScope.REGION).id("region1").description("region1").iso3166Codes(ImmutableSet.of("US-CA")).parent(provider).build(),
+               new LocationBuilder().scope(LocationScope.REGION).id("region2").description("region2").iso3166Codes(ImmutableSet.of("US-VA")).parent(provider).build()
+               ));
+   }
+   
+   @Test(expectedExceptions = IllegalStateException.class)
+   public void testWhenNoRegions() {
+      Supplier<Set<String>> regionIdsSupplier = Suppliers.<Set<String>>ofInstance(ImmutableSet.<String>of());
+      Supplier<Map<String, Supplier<Set<String>>>> locationToIsoCodes = Suppliers.<Map<String, Supplier<Set<String>>>>ofInstance(
+               ImmutableMap.<String, Supplier<Set<String>>>of());
+      RegionToProvider fn = new RegionToProvider(justProvider, regionIdsSupplier, locationToIsoCodes);
+      fn.get();
+   }
+}

core/src/test/java/org/jclouds/location/suppliers/all/ZoneToProviderTest.java

@@ -0,0 +1,72 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.location.suppliers.all;
+
+import static org.testng.Assert.assertEquals;
+
+import java.net.URI;
+import java.util.Map;
+import java.util.Set;
+
+import org.jclouds.domain.Location;
+import org.jclouds.domain.LocationBuilder;
+import org.jclouds.domain.LocationScope;
+import org.testng.annotations.Test;
+
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * 
+ * @author Adrian Cole
+ */
+@Test(groups = "unit", testName = "ZoneToProviderTest")
+public class ZoneToProviderTest {
+   Location provider = new LocationBuilder().scope(LocationScope.PROVIDER).id("servo").description("http://servo")
+            .iso3166Codes(ImmutableSet.of("US")).build();
+   JustProvider justProvider = new JustProvider("servo", Suppliers.ofInstance(URI.create("http://servo")), ImmutableSet.of("US"));
+
+   @Test
+   public void test() {
+      Supplier<Set<String>> zoneIdsSupplier = Suppliers.<Set<String>>ofInstance(ImmutableSet.of("zone1", "zone2"));
+      Supplier<Map<String, Supplier<Set<String>>>> locationToIsoCodes = Suppliers.<Map<String, Supplier<Set<String>>>>ofInstance(
+               ImmutableMap.of(
+                        "servo", Suppliers.<Set<String>>ofInstance(ImmutableSet.of("US")),
+                        "zone1", Suppliers.<Set<String>>ofInstance(ImmutableSet.of("US-CA")),
+                        "zone2", Suppliers.<Set<String>>ofInstance(ImmutableSet.of("US-VA"))
+                        ));
+      ZoneToProvider fn = new ZoneToProvider(justProvider, zoneIdsSupplier, locationToIsoCodes);
+      
+      assertEquals(fn.get(), ImmutableSet.of(
+               new LocationBuilder().scope(LocationScope.ZONE).id("zone1").description("zone1").iso3166Codes(ImmutableSet.of("US-CA")).parent(provider).build(),
+               new LocationBuilder().scope(LocationScope.ZONE).id("zone2").description("zone2").iso3166Codes(ImmutableSet.of("US-VA")).parent(provider).build()
+               ));
+   }
+   
+   @Test(expectedExceptions = IllegalStateException.class)
+   public void testWhenNoZones() {
+      Supplier<Set<String>> zoneIdsSupplier = Suppliers.<Set<String>>ofInstance(ImmutableSet.<String>of());
+      Supplier<Map<String, Supplier<Set<String>>>> locationToIsoCodes = Suppliers.<Map<String, Supplier<Set<String>>>>ofInstance(
+               ImmutableMap.<String, Supplier<Set<String>>>of());
+      ZoneToProvider fn = new ZoneToProvider(justProvider, zoneIdsSupplier, locationToIsoCodes);
+      fn.get();
+   }
+}

core/src/test/java/org/jclouds/location/suppliers/implicit/FirstRegionTest.java

@@ -0,0 +1,70 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.location.suppliers.implicit;
+
+import static org.testng.Assert.assertEquals;
+
+import java.util.NoSuchElementException;
+import java.util.Set;
+
+import org.jclouds.domain.Location;
+import org.jclouds.domain.LocationBuilder;
+import org.jclouds.domain.LocationScope;
+import org.testng.annotations.Test;
+
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Tests behavior of {@code FirstRegion}
+ * 
+ * @author Adrian Cole
+ */
+@Test(groups = "unit", testName = "FirstRegionTest")
+public class FirstRegionTest {
+   Location provider = new LocationBuilder().scope(LocationScope.PROVIDER).id("servo").description("http://servo")
+         .build();
+   Location region = new LocationBuilder().scope(LocationScope.REGION).id("servo-r").description("http://r.servo")
+         .parent(provider).build();
+   Location zone = new LocationBuilder().scope(LocationScope.ZONE).id("servo-z").description("http://z.r.servo")
+         .parent(region).build();
+
+   @Test
+   public void testDidntFindRegionThrowsNSEEWithReasonableMessage() {
+      Supplier<Set<? extends Location>> supplier = Suppliers.<Set<? extends Location>> ofInstance(ImmutableSet
+            .<Location> of(provider, zone));
+      FirstRegion fn = new FirstRegion(supplier);
+
+      try {
+         fn.get();
+         assert false;
+      } catch (NoSuchElementException e) {
+         assertEquals(e.getMessage(), "none to of the locations are scope REGION: [servo:PROVIDER, servo-z:ZONE]");
+      }
+   }
+
+   @Test
+   public void testFirstRegion() {
+      Supplier<Set<? extends Location>> supplier = Suppliers.<Set<? extends Location>> ofInstance(ImmutableSet
+            .<Location> of(provider, region, zone));
+      FirstRegion fn = new FirstRegion(supplier);
+      assertEquals(fn.get(), region);
+   }
+}

core/src/test/java/org/jclouds/location/suppliers/implicit/FirstZoneTest.java

@@ -0,0 +1,70 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.location.suppliers.implicit;
+
+import static org.testng.Assert.assertEquals;
+
+import java.util.NoSuchElementException;
+import java.util.Set;
+
+import org.jclouds.domain.Location;
+import org.jclouds.domain.LocationBuilder;
+import org.jclouds.domain.LocationScope;
+import org.testng.annotations.Test;
+
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Tests behavior of {@code FirstZone}
+ * 
+ * @author Adrian Cole
+ */
+@Test(groups = "unit", testName = "FirstZoneTest")
+public class FirstZoneTest {
+   Location provider = new LocationBuilder().scope(LocationScope.PROVIDER).id("servo").description("http://servo")
+         .build();
+   Location region = new LocationBuilder().scope(LocationScope.REGION).id("servo-r").description("http://r.servo")
+         .parent(provider).build();
+   Location zone = new LocationBuilder().scope(LocationScope.ZONE).id("servo-z").description("http://z.r.servo")
+         .parent(region).build();
+
+   @Test
+   public void testDidntFindZoneThrowsNSEEWithReasonableMessage() {
+      Supplier<Set<? extends Location>> supplier = Suppliers.<Set<? extends Location>> ofInstance(ImmutableSet
+            .<Location> of(provider, region));
+      FirstZone fn = new FirstZone(supplier);
+
+      try {
+         fn.get();
+         assert false;
+      } catch (NoSuchElementException e) {
+         assertEquals(e.getMessage(), "none to of the locations are scope ZONE: [servo:PROVIDER, servo-r:REGION]");
+      }
+   }
+
+   @Test
+   public void testFirstZone() {
+      Supplier<Set<? extends Location>> supplier = Suppliers.<Set<? extends Location>> ofInstance(ImmutableSet
+            .<Location> of(provider, region, zone));
+      FirstZone fn = new FirstZone(supplier);
+      assertEquals(fn.get(), zone);
+   }
+}