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 Charsets() { 29 } 30 31 /** 32 * Gets a Charset, starting with the preferred {@code charsetName} if supported, if not, use UTF-8, if not 33 * supported, use the platform default. 34 * 35 * @param charsetName 36 * the preferred charset name 37 * @return a Charset, not null. 38 */ 39 public static Charset getSupportedCharset(final String charsetName) { 40 Charset charset = null; 41 if (charsetName != null) { 42 if (Charset.isSupported(charsetName)) { 43 charset = Charset.forName(charsetName); 44 } 45 } 46 if (charset == null) { 47 charset = Charset.isSupported("UTF-8") ? Charset.forName("UTF-8") : Charset.defaultCharset(); 48 if (charsetName != null) { 49 StatusLogger.getLogger().error("Charset " + charsetName + " is not supported for layout, using " + 50 charset.displayName()); 51 } 52 } 53 return charset; 54 } 55 56 }