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    
019    package org.apache.hadoop.lib.wsrs;
020    
021    import org.apache.hadoop.classification.InterfaceAudience;
022    import org.apache.hadoop.util.StringUtils;
023    
024    import java.util.Arrays;
025    
026    @InterfaceAudience.Private
027    public abstract class EnumParam<E extends Enum<E>> extends Param<E> {
028      Class<E> klass;
029    
030      public EnumParam(String name, Class<E> e, E defaultValue) {
031        super(name, defaultValue);
032        klass = e;
033      }
034    
035      @Override
036      protected E parse(String str) throws Exception {
037        return Enum.valueOf(klass, str.toUpperCase());
038      }
039    
040      @Override
041      protected String getDomain() {
042        return StringUtils.join(",", Arrays.asList(klass.getEnumConstants()));
043      }
044    
045    }