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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  }