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 * 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.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 }