org.jclouds.googlecomputeengine.compute.functions.OrphanedGroupsFromDeadNodes 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.googlecomputeengine.compute.functions;

import java.util.Set;

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

import org.jclouds.compute.domain.NodeMetadata;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Sets;

/**
 * @author David Alves
 */
@Singleton
public class OrphanedGroupsFromDeadNodes implements Function, Set> {

   private final Predicate isOrphanedGroupPredicate;

   @Inject
   public OrphanedGroupsFromDeadNodes(Predicate isOrphanedGroupPredicate) {
      this.isOrphanedGroupPredicate = isOrphanedGroupPredicate;
   }


   @Override
   public Set apply(Set deadNodes) {
      Set groups = Sets.newLinkedHashSet();
      for (NodeMetadata deadNode : deadNodes) {
         groups.add(deadNode.getGroup());
      }
      Set orphanedGroups = Sets.newLinkedHashSet();
      for (String group : groups) {
         if (isOrphanedGroupPredicate.apply(group)) {
            orphanedGroups.add(group);
         }
      }
      return orphanedGroups;
   }


}