apis/cloudstack/src/main/java/org/jclouds/cloudstack/functions/ZoneIdToZone.java

/**
 * 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.cloudstack.functions;

import com.google.common.cache.CacheLoader;
import com.google.inject.Inject;
import org.jclouds.cloudstack.CloudStackClient;
import org.jclouds.cloudstack.domain.Zone;
import org.jclouds.cloudstack.features.ZoneClient;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Defines a cache that allows a zone to be looked up by its ID.
 *
 * @author Richard Downer
 */
public class ZoneIdToZone extends CacheLoader<Long, Zone> {

   private final ZoneClient zoneClient;

   @Inject
   public ZoneIdToZone(CloudStackClient client) {
      checkNotNull(client, "client");
      this.zoneClient = client.getZoneClient();
   }

   @Override
   public Zone load(Long zoneId) throws Exception {
      checkNotNull(zoneId, "zoneId");
      return zoneClient.getZone(zoneId);
   }

}