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Google App Engine compliant variation of FreeMarker. FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
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/*
 * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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 LocationAwareSLF4JLogger 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();
		}
		
	}

}