org.jclouds.aws.ec2.compute.suppliers.EC2LocationSupplier.java Source code

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Here is the source code for org.jclouds.aws.ec2.compute.suppliers.EC2LocationSupplier.java

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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * Licensed 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.aws.ec2.compute.suppliers;

import static com.google.common.collect.Maps.uniqueIndex;
import static com.google.common.collect.Sets.newLinkedHashSet;

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.LocationScope;
import org.jclouds.domain.internal.LocationImpl;
import org.jclouds.rest.annotations.Provider;

import com.google.common.base.Function;
import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableMap;

/**
 * 
 * @author Adrian Cole
 */
@Singleton
public class EC2LocationSupplier implements Supplier<Set<? extends Location>> {
    private final Map<String, String> availabilityZoneToRegionMap;
    private final String providerName;

    @Inject
    EC2LocationSupplier(Map<String, String> availabilityZoneToRegionMap, @Provider String providerName) {
        this.availabilityZoneToRegionMap = availabilityZoneToRegionMap;
        this.providerName = providerName;
    }

    @Override
    public Set<? extends Location> get() {
        Location ec2 = new LocationImpl(LocationScope.PROVIDER, providerName, providerName, null);
        Set<Location> locations = newLinkedHashSet();
        for (String region : newLinkedHashSet(availabilityZoneToRegionMap.values())) {
            locations.add(new LocationImpl(LocationScope.REGION, region, region, ec2));
        }
        ImmutableMap<String, Location> idToLocation = uniqueIndex(locations, new Function<Location, String>() {
            @Override
            public String apply(Location from) {
                return from.getId();
            }
        });
        for (String zone : availabilityZoneToRegionMap.keySet()) {
            locations.add(new LocationImpl(LocationScope.ZONE, zone, zone,
                    idToLocation.get(availabilityZoneToRegionMap.get(zone))));
        }
        return locations;
    }

}