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     */
018    package org.apache.hadoop.mapreduce;
019    
020    import java.util.HashMap;
021    import java.util.Map;
022    
023    import org.apache.hadoop.classification.InterfaceAudience;
024    import org.apache.hadoop.classification.InterfaceStability;
025    
026    /**
027     * Enum representing queue state
028     */
029    @InterfaceAudience.Public
030    @InterfaceStability.Evolving
031    public 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    }