1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations under the License.
17 */
18
19 package org.apache.shindig.social.opensocial.model;
20
21
22 import com.google.common.collect.Sets;
23
24 import java.util.Collections;
25 import java.util.Set;
26
27 /***
28 * Utility class for OpenSocial enums.
29 */
30 public final class EnumUtil {
31
32 /***
33 * This is a utility class and can't be constructed.
34 */
35 private EnumUtil() {
36
37 }
38 /***
39 *
40 * @param vals array of enums
41 * @return a set of the names for a list of Enum values defined by toString
42 */
43 // TODO: Because we have a Enum interface in this package we have to explicitly state the java.lang.Enum (bad ?)
44 public static Set<String> getEnumStrings(java.lang.Enum<?>... vals) {
45 Set<String> result = Sets.newHashSet();
46 for (java.lang.Enum<?> v : vals) {
47 result.add(v.toString());
48 }
49 if (result.size() != vals.length) {
50 throw new IllegalArgumentException("Enum names are not disjoint set");
51 }
52 return Collections.unmodifiableSet(result);
53 }
54 }