001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.mapreduce;
019
020import java.util.HashMap;
021import java.util.Map;
022
023import org.apache.hadoop.classification.InterfaceAudience;
024import org.apache.hadoop.classification.InterfaceStability;
025
026/**
027 * Enum representing queue state
028 */
029@InterfaceAudience.Public
030@InterfaceStability.Evolving
031public enum QueueState {
032
033  STOPPED("stopped"), RUNNING("running"), UNDEFINED("undefined");
034  private final String stateName;
035  private static Map<String, QueueState> enumMap =
036      new HashMap<String, QueueState>();
037
038  static {
039    for (QueueState state : QueueState.values()) {
040      enumMap.put(state.getStateName(), state);
041    }
042  }
043
044  QueueState(String stateName) {
045    this.stateName = stateName;
046  }
047
048  /**
049   * @return the stateName
050   */
051  public String getStateName() {
052    return stateName;
053  }
054
055  public static QueueState getState(String state) {
056    QueueState qState = enumMap.get(state);
057    if (qState == null) {
058      return UNDEFINED;
059    }
060    return qState;
061  }
062
063  @Override
064  public String toString() {
065    return stateName;
066  }
067
068}