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
18 package org.apache.commons.lang3;
19
20 import java.nio.charset.Charset;
21 import java.nio.charset.UnsupportedCharsetException;
22
23 /**
24 * Internal use only.
25 * <p>
26 * Provides utilities for {@link Charset}.
27 * </p>
28 * <p>
29 * Package private since Apache Commons IO already provides a Charsets because {@link Charset} is in
30 * {@code java.nio.charset}.
31 * </p>
32 *
33 * @since 3.10
34 */
35 final class Charsets {
36
37 /**
38 * Returns the given {@code charset} or the default Charset if {@code charset} is null.
39 *
40 * @param charset a Charset or null.
41 * @return the given {@code charset} or the default Charset if {@code charset} is null.
42 */
43 static Charset toCharset(final Charset charset) {
44 return charset == null ? Charset.defaultCharset() : charset;
45 }
46
47 /**
48 * Returns the given {@code charset} or the default Charset if {@code charset} is null.
49 *
50 * @param charsetName a Charset or null.
51 * @return the given {@code charset} or the default Charset if {@code charset} is null.
52 * @throws UnsupportedCharsetException If no support for the named charset is available in this instance of the Java
53 * virtual machine
54 */
55 static Charset toCharset(final String charsetName) {
56 return charsetName == null ? Charset.defaultCharset() : Charset.forName(charsetName);
57 }
58
59 /**
60 * Returns the given {@code charset} or the default Charset if {@code charset} is null.
61 *
62 * @param charsetName a Charset or null.
63 * @return the given {@code charset} or the default Charset if {@code charset} is null.
64 */
65 static String toCharsetName(final String charsetName) {
66 return charsetName == null ? Charset.defaultCharset().name() : charsetName;
67 }
68
69 }