1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache license, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the license for the specific language governing permissions and
15 * limitations under the license.
16 */
17 package org.apache.logging.log4j.core.helpers;
18
19 import java.nio.charset.Charset;
20
21 import org.apache.logging.log4j.status.StatusLogger;
22
23 /**
24 * Charset utilities.
25 */
26 public final class Charsets {
27
28 private static final String UTF_8 = "UTF-8";
29
30 private Charsets() {
31 }
32
33 /**
34 * Gets a Charset, starting with the preferred {@code charsetName} if supported, if not, use UTF-8.
35 *
36 * @param charsetName
37 * the preferred charset name
38 * @return a Charset, not null.
39 */
40 public static Charset getSupportedCharset(final String charsetName) {
41 Charset charset = null;
42 if (charsetName != null) {
43 if (Charset.isSupported(charsetName)) {
44 charset = Charset.forName(charsetName);
45 }
46 }
47 if (charset == null) {
48 charset = Charset.forName(UTF_8);
49 if (charsetName != null) {
50 StatusLogger.getLogger().error("Charset " + charsetName + " is not supported for layout, using " +
51 charset.displayName());
52 }
53 }
54 return charset;
55 }
56
57 }