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.lib.wsrs;
019
020 import java.util.Arrays;
021 import java.util.EnumSet;
022 import java.util.Iterator;
023
024 import org.apache.hadoop.classification.InterfaceAudience;
025
026 @InterfaceAudience.Private
027 public abstract class EnumSetParam<E extends Enum<E>> extends Param<EnumSet<E>> {
028 Class<E> klass;
029
030 public EnumSetParam(String name, Class<E> e, EnumSet<E> defaultValue) {
031 super(name, defaultValue);
032 klass = e;
033 }
034
035 @Override
036 protected EnumSet<E> parse(String str) throws Exception {
037 final EnumSet<E> set = EnumSet.noneOf(klass);
038 if (!str.isEmpty()) {
039 for (String sub : str.split(",")) {
040 set.add(Enum.valueOf(klass, sub.trim().toUpperCase()));
041 }
042 }
043 return set;
044 }
045
046 @Override
047 protected String getDomain() {
048 return Arrays.asList(klass.getEnumConstants()).toString();
049 }
050
051 /** Convert an EnumSet to a string of comma separated values. */
052 public static <E extends Enum<E>> String toString(EnumSet<E> set) {
053 if (set == null || set.isEmpty()) {
054 return "";
055 } else {
056 final StringBuilder b = new StringBuilder();
057 final Iterator<E> i = set.iterator();
058 b.append(i.next());
059 while (i.hasNext()) {
060 b.append(',').append(i.next());
061 }
062 return b.toString();
063 }
064 }
065
066 @Override
067 public String toString() {
068 return getName() + "=" + toString(value);
069 }
070 }