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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.
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/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.service.log;

import org.osgi.service.log.LogService;

/**
 * * Utility class for the LogService interface. * It exports methods that
 * translates between the numeric values of * the severity level constants and
 * human readable strings.
 */

public class LogUtil {
    /**
     * * Converts from a numeric log severity level to a string. * *
     * 
     * @param level
     *            is the log severity level.
     * @return TODO
     */
    static public String fromLevel(int level) {
        return fromLevel(level, 0);
    }

    /**
     * * Converts from a numeric log severity level to a left justified * string
     * of at least the given length. * *
     * 
     * @param level
     *            is the log severity level. *
     * @param length
     *            the minimum length of the resulting string.
     * @return TODO
     */
    static public String fromLevel(int level, int length) {
        StringBuffer sb = new StringBuffer(length > 7 ? length : 7);
        switch (level) {
        case LogService.LOG_INFO:
            sb.append("info");
            break;
        case LogService.LOG_DEBUG:
            sb.append("debug");
            break;
        case LogService.LOG_WARNING:
            sb.append("Warning");
            break;
        case LogService.LOG_ERROR:
            sb.append("ERROR");
            break;
        case 0:
            sb.append("DEFAULT");
            break;
        default:
            sb.append("[");
            sb.append(level);
            sb.append("]");
        }
        for (int i = sb.length(); i < length; i++) {
            sb.append(" ");
        }
        return sb.toString();
    }

    /**
     * * Converts a string representing a log severity level to an int. * *
     * 
     * @param level
     *            The string to convert. *
     * @param def
     *            Default value to use if the string is not * recognized as a
     *            log level. *
     * @return the log level, or the default value if the string can * not be
     *         recognized.
     */
    static public int toLevel(String level, int def) {
        if (level.equalsIgnoreCase("INFO")) {
            return LogService.LOG_INFO;
        } else if (level.equalsIgnoreCase("DEBUG")) {
            return LogService.LOG_DEBUG;
        } else if (level.equalsIgnoreCase("WARNING")) {
            return LogService.LOG_WARNING;
        } else if (level.equalsIgnoreCase("ERROR")) {
            return LogService.LOG_ERROR;
        } else if (level.equalsIgnoreCase("DEFAULT")) {
            return 0;
        }
        return def;
    }

}