code: /*
   * 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.skywalking.oap.server.core.version;
  
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.config.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;
  
  @Plugin(name = "VersionLogConverter", category = PatternConverter.CATEGORY)
  @ConverterKeys({"swversion"})
  public class VersionLogConverter extends LogEventPatternConverter {
      protected VersionLogConverter(String name) {
          super(name, null);
      }
  
      public static VersionLogConverter newInstance(String[] options) {
          return new VersionLogConverter("swversion");
      }
  
      @Override
      public void format(LogEvent event, StringBuilder toAppendTo) {
          toAppendTo.append(Version.CURRENT);
      }
  }
  