/**
    * 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 ch.qos.logback.classic.helpers;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import ch.qos.logback.classic.PatternLayout;
  import ch.qos.logback.classic.spi.ILoggingEvent;
  import ch.qos.logback.core.AppenderBase;
  
  /**
   * An appender used for testing.
   * 
   * @author ceki
   * @param <E>
   * @since 1.3.0
   */
  public class WithLayoutListAppender extends AppenderBase<ILoggingEvent> {
  
      public List<String> list = new ArrayList<>();
  
      String pattern;
  
      PatternLayout patternLayout;
  
      @Override
      public void start() {
          if (pattern == null) {
              addError("null pattern disallowed");
              return;
          }
          patternLayout = new PatternLayout();
          patternLayout.setContext(context);
          patternLayout.setPattern(pattern);
          patternLayout.start();
          if (patternLayout.isStarted())
              super.start();
      }
  
      protected void append(ILoggingEvent e) {
          String result = patternLayout.doLayout(e);
          list.add(result);
      }
  
      public String getPattern() {
          return pattern;
      }
  
      public void setPattern(String pattern) {
          this.pattern = pattern;
      }
  
  }