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jclouds Core components to access Amazon AWS
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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. 
 *
 * ====================================================================
 * 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.domain;

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

import org.jclouds.aws.ec2.EC2AsyncClient;

import com.google.common.base.CaseFormat;

/**
 * 
 * The current state of the instance..
 * 
 * @author Adrian Cole
 * @see EC2AsyncClient#describeInstances
 * @see EC2AsyncClient#runInstances
 * @see EC2AsyncClient#terminateInstances
 * 
 */
public enum InstanceState {

   /**
    * the instance is in the process of being launched
    */
   PENDING,

   /**
    * the instance launched (although the boot process might not be completed)
    */
   RUNNING,

   /**
    * the instance started shutting down
    */
   SHUTTING_DOWN,
   /**
    * the instance terminated
    */
   TERMINATED,
   /**
    * the instance is stopping
    */
   STOPPING,
   /**
    * the instance is stopped
    */
   STOPPED, UNRECOGNIZED;

   public String value() {
      return (CaseFormat.UPPER_UNDERSCORE.to(CaseFormat.LOWER_HYPHEN, name()));
   }

   @Override
   public String toString() {
      return value();
   }

   public static InstanceState fromValue(String state) {
      try {
         return valueOf(CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_UNDERSCORE, checkNotNull(state, "state")));
      } catch (IllegalArgumentException e) {
         return UNRECOGNIZED;
      }
   }

   public static InstanceState fromValue(int v) {
      switch (v) {
         case 0:
            return PENDING;
         case 16:
            return RUNNING;
         case 32:
            return SHUTTING_DOWN;
         case 48:
            return TERMINATED;
         case 64:
            return STOPPING;
         case 80:
            return STOPPED;
         default:
            return UNRECOGNIZED;
      }
   }
}