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EC2 implementation targeted to Amazon Web Services

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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.aws.ec2.predicates;

import java.util.NoSuchElementException;

import javax.annotation.Resource;
import javax.inject.Singleton;

import org.jclouds.aws.ec2.AWSEC2Api;
import org.jclouds.aws.ec2.domain.PlacementGroup;
import org.jclouds.logging.Logger;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.inject.Inject;

@Singleton
public class PlacementGroupDeleted implements Predicate {

   private final AWSEC2Api client;

   @Resource
   protected Logger logger = Logger.NULL;

   @Inject
   public PlacementGroupDeleted(AWSEC2Api client) {
      this.client = client;
   }

   public boolean apply(PlacementGroup group) {
      logger.trace("looking for state on group %s", group);
      try {
         group = refresh(group);
      } catch (NoSuchElementException e) {
         return true;
      }
      logger.trace("%s: looking for group state %s: currently: %s", group.getName(), PlacementGroup.State.DELETED,
               group.getState());
      return group.getState() == PlacementGroup.State.DELETED;
   }

   private PlacementGroup refresh(PlacementGroup group) {
      return Iterables.getOnlyElement(client.getPlacementGroupApi().get().describePlacementGroupsInRegion(
               group.getRegion(), group.getName()));
   }
}