com.mysql.cj.log.LogFactory Maven / Gradle / Ivy

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JDBC Type 4 driver for MySQL
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/*
 * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, version 2.0, as published by the
 * Free Software Foundation.
 *
 * This program is also distributed with certain software (including but not
 * limited to OpenSSL) that is licensed under separate terms, as designated in a
 * particular file or component or in included license documentation. The
 * authors of MySQL hereby grant you an additional permission to link the
 * program and your derivative works with the separately licensed software that
 * they have included with MySQL.
 *
 * Without limiting anything contained in the foregoing, this file, which is
 * part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
 * version 1.0, a copy of which can be found at
 * http://oss.oracle.com/licenses/universal-foss-exception.
 *
 * This program 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 General Public License, version 2.0,
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
 */

package com.mysql.cj.log;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import com.mysql.cj.exceptions.ExceptionFactory;
import com.mysql.cj.exceptions.WrongArgumentException;
import com.mysql.cj.util.Util;

/**
 * Creates instances of loggers for the driver to use.
 */
public class LogFactory {

    /**
     * Returns a logger instance of the given class, with the given instance
     * name.
     * 
     * @param className
     *            the class to instantiate
     * @param instanceName
     *            the instance name
     * @return a logger instance
     */
    public static Log getLogger(String className, String instanceName) {

        if (className == null) {
            throw ExceptionFactory.createException(WrongArgumentException.class, "Logger class can not be NULL");
        }

        if (instanceName == null) {
            throw ExceptionFactory.createException(WrongArgumentException.class, "Logger instance name can not be NULL");
        }

        try {
            Class loggerClass = null;

            try {
                loggerClass = Class.forName(className);
            } catch (ClassNotFoundException nfe) {
                loggerClass = Class.forName(Util.getPackageName(LogFactory.class) + "." + className);
            }

            Constructor constructor = loggerClass.getConstructor(new Class[] { String.class });

            return (Log) constructor.newInstance(new Object[] { instanceName });
        } catch (ClassNotFoundException cnfe) {
            throw ExceptionFactory.createException(WrongArgumentException.class, "Unable to load class for logger '" + className + "'", cnfe);
        } catch (NoSuchMethodException nsme) {
            throw ExceptionFactory.createException(WrongArgumentException.class,
                    "Logger class does not have a single-arg constructor that takes an instance name", nsme);
        } catch (InstantiationException inse) {
            throw ExceptionFactory.createException(WrongArgumentException.class,
                    "Unable to instantiate logger class '" + className + "', exception in constructor?", inse);
        } catch (InvocationTargetException ite) {
            throw ExceptionFactory.createException(WrongArgumentException.class,
                    "Unable to instantiate logger class '" + className + "', exception in constructor?", ite);
        } catch (IllegalAccessException iae) {
            throw ExceptionFactory.createException(WrongArgumentException.class,
                    "Unable to instantiate logger class '" + className + "', constructor not public", iae);
        } catch (ClassCastException cce) {
            throw ExceptionFactory.createException(WrongArgumentException.class,
                    "Logger class '" + className + "' does not implement the '" + Log.class.getName() + "' interface", cce);
        }
    }
}