/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package chapters.migrationFromLog4j;
  
  import ch.qos.logback.classic.spi.ILoggingEvent;
  import ch.qos.logback.core.AppenderBase;
  import ch.qos.logback.core.Layout;
  
  public class TrivialLogbackAppender extends AppenderBase<ILoggingEvent> {
  
      Layout<ILoggingEvent> layout;
  
      @Override
      public void start() {
          if (this.layout == null) {
              addError("No layout set for the appender named [" + name + "].");
              return;
          }
          String header = layout.getFileHeader();
          System.out.println(header);
          super.start();
      }
  
      @Override
      protected void append(ILoggingEvent loggingEvent) {
          // note that AppenderBase.doAppend will invoke this method only if
          // this appender was successfully started.
          String eventAsStr = this.layout.doLayout(loggingEvent);
          System.out.println(eventAsStr);
      }
  
  
      public Layout<ILoggingEvent> getLayout() {
          return layout;
      }
  
      public void setLayout(Layout<ILoggingEvent> layout) {
          this.layout = layout;
      }
  
  }