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1   /*
2    * Copyright 2016 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    *   http://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.codec.smtp;
17  
18  import java.util.Arrays;
19  import java.util.Collections;
20  import java.util.List;
21  
22  final class SmtpUtils {
23  
24      static List<CharSequence> toUnmodifiableList(CharSequence... sequences) {
25          if (sequences == null || sequences.length == 0) {
26              return Collections.emptyList();
27          }
28          return Collections.unmodifiableList(Arrays.asList(sequences));
29      }
30  
31      private SmtpUtils() { }
32  }