001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017 package org.apache.logging.log4j.core.helpers; 018 019 import java.nio.charset.Charset; 020 021 import org.apache.logging.log4j.status.StatusLogger; 022 023 /** 024 * Charset utilities. 025 */ 026 public final class Charsets { 027 028 private Charsets() { 029 } 030 031 /** 032 * Gets a Charset, starting with the preferred {@code charsetName} if supported, if not, use UTF-8, if not 033 * supported, use the platform default. 034 * 035 * @param charsetName 036 * the preferred charset name 037 * @return a Charset, not null. 038 */ 039 public static Charset getSupportedCharset(final String charsetName) { 040 Charset charset = null; 041 if (charsetName != null) { 042 if (Charset.isSupported(charsetName)) { 043 charset = Charset.forName(charsetName); 044 } 045 } 046 if (charset == null) { 047 charset = Charset.isSupported("UTF-8") ? Charset.forName("UTF-8") : Charset.defaultCharset(); 048 if (charsetName != null) { 049 StatusLogger.getLogger().error("Charset " + charsetName + " is not supported for layout, using " + 050 charset.displayName()); 051 } 052 } 053 return charset; 054 } 055 056 }