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 }