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.lib.wsrs;
019
020import java.util.Arrays;
021import java.util.EnumSet;
022import java.util.Iterator;
023
024import org.apache.hadoop.classification.InterfaceAudience;
025
026@InterfaceAudience.Private
027public 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}