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 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 */ toCharset(final Charset charset)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 */ toCharset(final String charsetName)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 */ toCharsetName(final String charsetName)65 static String toCharsetName(final String charsetName) { 66 return charsetName == null ? Charset.defaultCharset().name() : charsetName; 67 } 68 69 } 70