1 /*
2 * Copyright 2014 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.handler.ssl;
17
18 import static io.netty.util.internal.ObjectUtil.checkNonEmpty;
19
20 import java.util.ArrayList;
21 import java.util.List;
22
23 /**
24 * Utility class for application protocol common operations.
25 */
26 final class ApplicationProtocolUtil {
27 private static final int DEFAULT_LIST_SIZE = 2;
28
29 private ApplicationProtocolUtil() {
30 }
31
32 static List<String> toList(Iterable<String> protocols) {
33 return toList(DEFAULT_LIST_SIZE, protocols);
34 }
35
36 static List<String> toList(int initialListSize, Iterable<String> protocols) {
37 if (protocols == null) {
38 return null;
39 }
40
41 List<String> result = new ArrayList<String>(initialListSize);
42 for (String p : protocols) {
43 result.add(checkNonEmpty(p, "p"));
44 }
45
46 return checkNonEmpty(result, "result");
47 }
48
49 static List<String> toList(String... protocols) {
50 return toList(DEFAULT_LIST_SIZE, protocols);
51 }
52
53 static List<String> toList(int initialListSize, String... protocols) {
54 if (protocols == null) {
55 return null;
56 }
57
58 List<String> result = new ArrayList<String>(initialListSize);
59 for (String p : protocols) {
60 result.add(checkNonEmpty(p, "p"));
61 }
62
63 return checkNonEmpty(result, "result");
64 }
65 }
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