/**
    * 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;
  
  import ch.qos.logback.core.Context;
  import ch.qos.logback.core.spi.ContextAware;
  
  public class ConverterUtil {
  
      /**
       * Start converters in the chain of converters.
       *
       * @param head
       */
      public static <E> void startConverters(Converter<E> head) {
          Converter<E> c = head;
          while (c != null) {
              // CompositeConverter is a subclass of DynamicConverter
              if (c instanceof CompositeConverter) {
                  CompositeConverter<E> cc = (CompositeConverter<E>) c;
                  Converter<E> childConverter = cc.childConverter;
                  startConverters(childConverter);
                  cc.start();
              } else if (c instanceof DynamicConverter) {
                  DynamicConverter<E> dc = (DynamicConverter<E>) c;
                  dc.start();
              }
              c = c.getNext();
          }
      }
  
      public static <E> Converter<E> findTail(Converter<E> head) {
          Converter<E> p = head;
          while (p != null) {
              Converter<E> next = p.getNext();
              if (next == null) {
                  break;
              } else {
                  p = next;
              }
          }
          return p;
      }
  
      public static <E> void setContextForConverters(Context context, Converter<E> head) {
          Converter<E> c = head;
          while (c != null) {
              if (c instanceof ContextAware) {
                  ((ContextAware) c).setContext(context);
              }
              if (c instanceof CompositeConverter) {
                  CompositeConverter<E> cc = (CompositeConverter<E>) c;
                  Converter<E> childConverter = cc.childConverter;
                  setContextForConverters(context, childConverter);
              }
              c = c.getNext();
          }
      }
  }