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

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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;

/**
 * @deprecated Don't use it, meant to be internal.
 */
// 2.4: Remove
@Deprecated
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;
            }

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

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

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

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

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

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

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

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

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

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

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

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

            @Override
            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;
            }

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

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

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

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

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

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

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

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

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

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

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

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

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