/*
 * 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.ec2.suppliers;

import java.net.URI;
import java.util.Map;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.ec2.EC2Client;
import org.jclouds.ec2.services.AvailabilityZoneAndRegionClient;
import org.jclouds.location.Region;
import org.jclouds.location.suppliers.RegionIdToURISupplier;
import org.jclouds.util.Suppliers2;

import com.google.common.base.Supplier;
import com.google.common.collect.Maps;

@Singleton
public class DescribeRegionsForRegionURIs implements RegionIdToURISupplier {
   private final AvailabilityZoneAndRegionClient client;

   @Inject
   public DescribeRegionsForRegionURIs(EC2Client client) {
      this.client = client.getAvailabilityZoneAndRegionServices();
   }

   @Singleton
   @Region
   @Override
   public Map<String, Supplier<URI>> get() {
      Map<String, URI> regionToUris = client.describeRegions();
      return Maps.transformValues(regionToUris, Suppliers2.<URI> ofInstanceFunction());
   }
}
