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LogFactory.java
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Tue, Jun 4, 22:45

LogFactory.java
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/*
Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FOSS License Exception
<http://www.mysql.com/about/legal/licensing/foss-exception.html>.
This program is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation; version 2
of the License.
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 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.jdbc.log;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.sql.SQLException;
import com.mysql.jdbc.ExceptionInterceptor;
import com.mysql.jdbc.SQLError;
import com.mysql.jdbc.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
* @throws SQLException
* if unable to create a logger instance
*/
public static Log getLogger(String className, String instanceName, ExceptionInterceptor exceptionInterceptor) throws SQLException {
if (className == null) {
throw SQLError.createSQLException("Logger class can not be NULL", SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
}
if (instanceName == null) {
throw SQLError.createSQLException("Logger instance name can not be NULL", SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
}
try {
Class<?> loggerClass = null;
try {
loggerClass = Class.forName(className);
} catch (ClassNotFoundException nfe) {
loggerClass = Class.forName(Util.getPackageName(Log.class) + "." + className);
}
Constructor<?> constructor = loggerClass.getConstructor(new Class[] { String.class });
return (Log) constructor.newInstance(new Object[] { instanceName });
} catch (ClassNotFoundException cnfe) {
SQLException sqlEx = SQLError.createSQLException("Unable to load class for logger '" + className + "'", SQLError.SQL_STATE_ILLEGAL_ARGUMENT,
exceptionInterceptor);
sqlEx.initCause(cnfe);
throw sqlEx;
} catch (NoSuchMethodException nsme) {
SQLException sqlEx = SQLError.createSQLException("Logger class does not have a single-arg constructor that takes an instance name",
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
sqlEx.initCause(nsme);
throw sqlEx;
} catch (InstantiationException inse) {
SQLException sqlEx = SQLError.createSQLException("Unable to instantiate logger class '" + className + "', exception in constructor?",
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
sqlEx.initCause(inse);
throw sqlEx;
} catch (InvocationTargetException ite) {
SQLException sqlEx = SQLError.createSQLException("Unable to instantiate logger class '" + className + "', exception in constructor?",
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
sqlEx.initCause(ite);
throw sqlEx;
} catch (IllegalAccessException iae) {
SQLException sqlEx = SQLError.createSQLException("Unable to instantiate logger class '" + className + "', constructor not public",
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
sqlEx.initCause(iae);
throw sqlEx;
} catch (ClassCastException cce) {
SQLException sqlEx = SQLError.createSQLException("Logger class '" + className + "' does not implement the '" + Log.class.getName() + "' interface",
SQLError.SQL_STATE_ILLEGAL_ARGUMENT, exceptionInterceptor);
sqlEx.initCause(cce);
throw sqlEx;
}
}
}

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