/**
    * 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.core.pattern;
  
  abstract public class CompositeConverter<E> extends DynamicConverter<E> {
  
      Converter<E> childConverter;
  
      public String convert(E event) {
          StringBuilder buf = new StringBuilder();
  
          for (Converter<E> c = childConverter; c != null; c = c.next) {
              c.write(buf, event);
          }
          String intermediary = buf.toString();
          return transform(event, intermediary);
      }
  
      abstract protected String transform(E event, String in);
  
      public Converter<E> getChildConverter() {
          return childConverter;
      }
  
      public void setChildConverter(Converter<E> child) {
          childConverter = child;
      }
  
      public String toString() {
          StringBuilder buf = new StringBuilder();
          buf.append("CompositeConverter<");
  
          if (formattingInfo != null)
              buf.append(formattingInfo);
  
          if (childConverter != null) {
              buf.append(", children: ").append(childConverter);
          }
          buf.append(">");
          return buf.toString();
      }
  }