| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache license, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the license for the specific language governing permissions and |
| * limitations under the license. |
| */ |
| package org.apache.log4j.pattern; |
| |
| import org.apache.logging.log4j.core.LogEvent; |
| import org.apache.logging.log4j.plugins.Plugin; |
| import org.apache.logging.log4j.core.pattern.ConverterKeys; |
| import org.apache.logging.log4j.core.pattern.LogEventPatternConverter; |
| import org.apache.logging.log4j.core.pattern.PatternConverter; |
| import org.apache.logging.log4j.util.Strings; |
| |
| import java.util.List; |
| |
| |
| /** |
| * Returns the event's NDC in a StringBuilder. |
| */ |
| @Plugin(name = "Log4j1NdcPatternConverter", category = PatternConverter.CATEGORY) |
| @ConverterKeys({ "ndc" }) |
| public final class Log4j1NdcPatternConverter extends LogEventPatternConverter { |
| /** |
| * Singleton. |
| */ |
| private static final Log4j1NdcPatternConverter INSTANCE = |
| new Log4j1NdcPatternConverter(); |
| |
| /** |
| * Private constructor. |
| */ |
| private Log4j1NdcPatternConverter() { |
| super("Log4j1NDC", "ndc"); |
| } |
| |
| /** |
| * Obtains an instance of NdcPatternConverter. |
| * |
| * @param options options, may be null. |
| * @return instance of NdcPatternConverter. |
| */ |
| public static Log4j1NdcPatternConverter newInstance(final String[] options) { |
| return INSTANCE; |
| } |
| |
| @Override |
| public void format(final LogEvent event, final StringBuilder toAppendTo) { |
| final List<String> ndc = event.getContextStack().asList(); |
| toAppendTo.append(Strings.join(ndc, ' ')); |
| } |
| } |