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 }