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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * 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.pattern;

import ch.qos.logback.classic.spi.ILoggingEvent;

public abstract class NamedConverter extends ClassicConverter {

    Abbreviator abbreviator = null;

    /**
     * Gets fully qualified name from event.
     * 
     * @param event
     *          The LoggingEvent to process, cannot not be null.
     * @return name, must not be null.
     */
    protected abstract String getFullyQualifiedName(final ILoggingEvent event);

    public void start() {
        String optStr = getFirstOption();
        if (optStr != null) {
            try {
                int targetLen = Integer.parseInt(optStr);
                if (targetLen == 0) {
                    abbreviator = new ClassNameOnlyAbbreviator();
                } else if (targetLen > 0) {
                    abbreviator = new TargetLengthBasedClassNameAbbreviator(targetLen);
                }
            } catch (NumberFormatException nfe) {
                // FIXME: better error reporting
            }
        }
    }

    public String convert(ILoggingEvent event) {
        String fqn = getFullyQualifiedName(event);

        if (abbreviator == null) {
            return fqn;
        } else {
            return abbreviator.abbreviate(fqn);
        }
    }
}