org.jclouds.location.suppliers.derived.RegionIdsFromRegionIdToURIKeySet Maven / Gradle / Ivy

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/*
 * 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.location.suppliers.derived;

import static shaded.com.google.common.base.Throwables.propagate;

import java.lang.reflect.UndeclaredThrowableException;
import java.net.URI;
import java.util.Map;
import java.util.Set;

import org.jclouds.location.Region;
import org.jclouds.location.suppliers.RegionIdsSupplier;

import shaded.com.google.common.base.Supplier;
import shaded.com.google.inject.Inject;

/** As opposed to via properties, lets look up regions via api, as they are more likely to change. */
public final class RegionIdsFromRegionIdToURIKeySet implements RegionIdsSupplier {

   private final Supplier>> regionIdToURIs;

   @Inject
   RegionIdsFromRegionIdToURIKeySet(@Region Supplier>> regionIdToURIs) {
      this.regionIdToURIs = regionIdToURIs;
   }

   @Override
   public Set get() {
      try {
         return regionIdToURIs.get().keySet();
      } catch (UndeclaredThrowableException e) {
         throw propagate(e.getCause());
      }
   }
}