src/main/java/freemarker/log/SLF4JLoggerFactory.java

/*
 * Copyright (c) 2003 The Visigoth Software Society. All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Visigoth Software Society (http://www.visigoths.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
 *    project contributors may be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact visigoths@visigoths.org.
 *
 * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
 *    nor may "FreeMarker" or "Visigoth" appear in their names
 *    without prior written permission of the Visigoth Software Society.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 VISIGOTH SOFTWARE SOCIETY OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Visigoth Software Society. For more
 * information on the Visigoth Software Society, please see
 * http://www.visigoths.org/
 */

package freemarker.log;

import org.slf4j.spi.LocationAwareLogger;

/**
 * Internal class, don't use it; no backward-compatibility guarantees. This class was left public accidentally, but
 * fixing it would be non-BC.
 */
//2.4: rename to _*
public class SLF4JLoggerFactory implements LoggerFactory {
	
	public Logger getLogger(String category) {
		org.slf4j.Logger slf4jLogger = org.slf4j.LoggerFactory.getLogger(category);
		if (slf4jLogger instanceof LocationAwareLogger) {
			return new LocationAwareSLF4JLogger((LocationAwareLogger) slf4jLogger);
		} else {
			return new LocationUnawareSLF4JLogger(slf4jLogger);
		}
	}

	/**
	 * Logger where the log entry issuer (class, method) will be correctly
	 * shown to be the caller of <tt>LocationAwareSLF4JLogger</tt> methods.
	 */
	private static final class LocationAwareSLF4JLogger extends Logger {
		
		private static final String ADAPTER_FQCN
				= LocationAwareSLF4JLogger.class.getName();
		
		private final LocationAwareLogger logger;
		
		LocationAwareSLF4JLogger(LocationAwareLogger logger) {
			this.logger = logger;
		}

		public void debug(String message) {
			debug(message, null);
		}

		public void debug(String message, Throwable t) {
			logger.log(null, ADAPTER_FQCN,
					LocationAwareLogger.DEBUG_INT, message, null, t);
		}

		public void info(String message) {
			info(message, null);
		}

		public void info(String message, Throwable t) {
			logger.log(null, ADAPTER_FQCN,
					LocationAwareLogger.INFO_INT, message, null, t);
		}

		public void warn(String message) {
			warn(message, null);
		}

		public void warn(String message, Throwable t) {
			logger.log(null, ADAPTER_FQCN,
					LocationAwareLogger.WARN_INT, message, null, t);
		}

		public void error(String message) {
			error(message, null);
		}

		public void error(String message, Throwable t) {
			logger.log(null, ADAPTER_FQCN,
					LocationAwareLogger.ERROR_INT, message, null, t);
		}

		public boolean isDebugEnabled() {
			return logger.isDebugEnabled();
		}

		public boolean isInfoEnabled() {
			return logger.isInfoEnabled();
		}

		public boolean isWarnEnabled() {
			return logger.isWarnEnabled();
		}

		public boolean isErrorEnabled() {
			return logger.isErrorEnabled();
		}

		public boolean isFatalEnabled() {
			return logger.isErrorEnabled();
		}
		
	}
	
	/**
	 * Logger where the log entry issuer (class, method) will be incorrectly
	 * shown to be a method of this class.
	 */
	private static class LocationUnawareSLF4JLogger extends Logger {
		
		private final org.slf4j.Logger logger;

		LocationUnawareSLF4JLogger(org.slf4j.Logger logger) {
			this.logger = logger;
		}

		public void debug(String message) {
			logger.debug(message);
		}

		public void debug(String message, Throwable t) {
			logger.debug(message, t);
		}

		public void info(String message) {
			logger.info(message);
		}

		public void info(String message, Throwable t) {
			logger.info(message, t);
		}

		public void warn(String message) {
			logger.warn(message);
		}

		public void warn(String message, Throwable t) {
			logger.warn(message, t);
		}

		public void error(String message) {
			logger.error(message);
		}

		public void error(String message, Throwable t) {
			logger.error(message, t);
		}

		public boolean isDebugEnabled() {
			return logger.isDebugEnabled();
		}

		public boolean isInfoEnabled() {
			return logger.isInfoEnabled();
		}

		public boolean isWarnEnabled() {
			return logger.isWarnEnabled();
		}

		public boolean isErrorEnabled() {
			return logger.isErrorEnabled();
		}

		public boolean isFatalEnabled() {
			return logger.isErrorEnabled();
		}
		
	}

}