| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hdfs.web.resources; |
| |
| import java.util.Arrays; |
| import java.util.EnumSet; |
| import java.util.Iterator; |
| import org.apache.hadoop.util.StringUtils; |
| |
| abstract class EnumSetParam<E extends Enum<E>> |
| extends Param<EnumSet<E>, EnumSetParam.Domain<E>> { |
| /** Convert an EnumSet to a string of comma separated values. */ |
| static <E extends Enum<E>> String toString(EnumSet<E> set) { |
| if (set == null || set.isEmpty()) { |
| return ""; |
| } else { |
| final StringBuilder b = new StringBuilder(); |
| final Iterator<E> i = set.iterator(); |
| b.append(i.next()); |
| for(; i.hasNext(); ) { |
| b.append(',').append(i.next()); |
| } |
| return b.toString(); |
| } |
| } |
| |
| static <E extends Enum<E>> EnumSet<E> toEnumSet(final Class<E> clazz, |
| final E[] values) { |
| final EnumSet<E> set = EnumSet.noneOf(clazz); |
| set.addAll(Arrays.asList(values)); |
| return set; |
| } |
| |
| EnumSetParam(final Domain<E> domain, final EnumSet<E> value) { |
| super(domain, value); |
| } |
| |
| @Override |
| public String toString() { |
| return getName() + "=" + toString(value); |
| } |
| |
| /** @return the parameter value as a string */ |
| @Override |
| public String getValueString() { |
| return toString(value); |
| } |
| |
| /** The domain of the parameter. */ |
| static final class Domain<E extends Enum<E>> extends Param.Domain<EnumSet<E>> { |
| private final Class<E> enumClass; |
| |
| Domain(String name, final Class<E> enumClass) { |
| super(name); |
| this.enumClass = enumClass; |
| } |
| |
| @Override |
| public final String getDomain() { |
| return Arrays.asList(enumClass.getEnumConstants()).toString(); |
| } |
| |
| /** The string contains a comma separated values. */ |
| @Override |
| final EnumSet<E> parse(final String str) { |
| final EnumSet<E> set = EnumSet.noneOf(enumClass); |
| if (!str.isEmpty()) { |
| for(int i, j = 0; j >= 0; ) { |
| i = j > 0 ? j + 1 : 0; |
| j = str.indexOf(',', i); |
| final String sub = j >= 0? str.substring(i, j): str.substring(i); |
| set.add(Enum.valueOf(enumClass, StringUtils.toUpperCase(sub.trim()))); |
| } |
| } |
| return set; |
| } |
| } |
| } |