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.
/**
 * 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();
    }
}