/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2013, 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();
  }
}
