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JDBC driver for MariaDB and MySQL for java 7
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/*
 *
 * MariaDB Client for Java
 *
 * Copyright (c) 2012-2014 Monty Program Ab.
 * Copyright (c) 2015-2017 MariaDB Ab.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with this library; if not, write to Monty Program Ab [email protected].
 *
 * This particular MariaDB Client for Java file is work
 * derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
 * the following copyright and notice provisions:
 *
 * Copyright (c) 2009-2011, Marcus Eriksson
 *
 * 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 driver nor the names of its contributors may not 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 HOLDER 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.mariadb.jdbc.internal.logging;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class LoggerFactory {
    public static final Logger NO_LOGGER = new NoLogger();
    public static Boolean hasToLog = null;
    public static Class loggerClass = null;
    public static Method method = null;

    /**
     * Initialize factory.
     *
     * @param mustLog indicate if must initiate Slf4j log
     */
    @SuppressWarnings("unchecked")
    public static void init(boolean mustLog) {
        if (hasToLog == null || hasToLog != mustLog) {
            if (mustLog) {
                synchronized (LoggerFactory.class) {
                    if (hasToLog == null || hasToLog != mustLog) {
                        try {
                            loggerClass = Class.forName("org.slf4j.LoggerFactory");
                            method = loggerClass.getMethod("getLogger", Class.class);
                            hasToLog = Boolean.TRUE;
                        } catch (ClassNotFoundException classNotFound) {
                            System.out.println("Logging cannot be activated, missing slf4j dependency");
                            hasToLog = Boolean.FALSE;
                        } catch (NoSuchMethodException classNotFound) {
                            System.out.println("Logging cannot be activated, missing slf4j dependency");
                            hasToLog = Boolean.FALSE;
                        }
                    }
                }
            }
        }

    }

    /**
     * Initialize logger.
     *
     * @param clazz initiator class
     * @return logger
     */
    public static Logger getLogger(Class clazz) {
        if (hasToLog != null && hasToLog) {
            try {
                return new Slf4JLogger((org.slf4j.Logger) method.invoke(loggerClass, clazz));
            } catch (IllegalAccessException illegalAccess) {
                return null;
            } catch (InvocationTargetException invocationException) {
                return null;
            }
        } else {
            return NO_LOGGER;
        }
    }

}