/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* 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 org.apache.log4j;
import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;
import org.slf4j.spi.LocationAwareLogger;
/**
* <p>
* This class is a minimal implementation of the original
* <code>org.apache.log4j.Category</code> class (as found in log4j 1.2) by
* delegation of all calls to a {@link org.slf4j.Logger} instance.
* </p>
*
* <p>
* Log4j's <code>trace</code>, <code>debug()</code>, <code>info()</code>,
* <code>warn()</code>, <code>error()</code> printing methods are directly
* mapped to their SLF4J equivalents. Log4j's <code>fatal()</code> printing
* method is mapped to SLF4J's <code>error()</code> method with a FATAL marker.
*
* @author Sébastien Pennec
* @author Ceki Gülcü
*/
public class Category {
private static final String CATEGORY_FQCN = Category.class.getName();
private String name;
protected org.slf4j.Logger slf4jLogger;
private org.slf4j.spi.LocationAwareLogger locationAwareLogger;
private static Marker FATAL_MARKER = MarkerFactory.getMarker("FATAL");
Category(String name) {
this.name = name;
slf4jLogger = LoggerFactory.getLogger(name);
if (slf4jLogger instanceof LocationAwareLogger) {
locationAwareLogger = (LocationAwareLogger) slf4jLogger;
}
}
public static Category getInstance(Class clazz) {
return Log4jLoggerFactory.getLogger(clazz.getName());
}
public static Category getInstance(String name) {
return Log4jLoggerFactory.getLogger(name);
}
/**
* Returns the obvious.
*
* @return
*/
public String getName() {
return name;
}
/**
* Return the level in effect for this category/logger.
*
* <p>
* The result is computed by simulation.
*
* @return
*/
public Level getEffectiveLevel() {
if (slf4jLogger.isTraceEnabled()) {
return Level.TRACE;
}
if (slf4jLogger.isDebugEnabled()) {
return Level.DEBUG;
}
if (slf4jLogger.isInfoEnabled()) {
return Level.INFO;
}
if (slf4jLogger.isWarnEnabled()) {
return Level.WARN;
}
return Level.ERROR;
}
/**
* Returns the assigned {@link Level}, if any, for this Category. This
* implementation always returns null.
*
* @return Level - the assigned Level, can be <code>null</code>.
*/
final public Level getLevel() {
return null;
}
/**
* @deprecated Please use {@link #getLevel} instead.
*/
final public Level getPriority() {
return null;
}
/**
* Delegates to {@link org.slf4j.Logger#isDebugEnabled} method in SLF4J
*/
public boolean isDebugEnabled() {
return slf4jLogger.isDebugEnabled();
}
/**
* Delegates to {@link org.slf4j.Logger#isInfoEnabled} method in SLF4J
*/
public boolean isInfoEnabled() {
return slf4jLogger.isInfoEnabled();
}
/**
* Delegates tob {@link org.slf4j.Logger#isWarnEnabled} method in SLF4J
*/
public boolean isWarnEnabled() {
return slf4jLogger.isWarnEnabled();
}
/**
* Delegates to {@link org.slf4j.Logger#isErrorEnabled} method in SLF4J
*/
public boolean isErrorEnabled() {
return slf4jLogger.isErrorEnabled();
}
/**
* Determines whether the priority passed as parameter is enabled in the
* underlying SLF4J logger. Each log4j priority is mapped directly to its
* SLF4J equivalent, except for FATAL which is mapped as ERROR.
*
* @param p
* the priority to check against
* @return true if this logger is enabled for the given level, false
* otherwise.
*/
public boolean isEnabledFor(Priority p) {
switch (p.level) {
case Level.TRACE_INT:
return slf4jLogger.isTraceEnabled();
case Level.DEBUG_INT:
return slf4jLogger.isDebugEnabled();
case Level.INFO_INT:
return slf4jLogger.isInfoEnabled();
case Level.WARN_INT:
return slf4jLogger.isWarnEnabled();
case Level.ERROR_INT:
return slf4jLogger.isErrorEnabled();
case Priority.FATAL_INT:
return slf4jLogger.isErrorEnabled();
}
return false;
}
void differentiatedLog(Marker marker, String fqcn, int level, Object message,
Throwable t) {
String m = convertToString(message);
if (locationAwareLogger != null) {
locationAwareLogger.log(marker, fqcn, level, m, null, t);
} else {
switch (level) {
case LocationAwareLogger.TRACE_INT:
slf4jLogger.trace(marker, m);
break;
case LocationAwareLogger.DEBUG_INT:
slf4jLogger.debug(marker, m);
break;
case LocationAwareLogger.INFO_INT:
slf4jLogger.info(marker, m);
break;
case LocationAwareLogger.WARN_INT:
slf4jLogger.warn(marker, m);
break;
case LocationAwareLogger.ERROR_INT:
slf4jLogger.error(marker, m);
break;
}
}
}
/**
* Delegates to {@link org.slf4j.Logger#debug(String)} method of SLF4J.
*/
public void debug(Object message) {
differentiatedLog(null, CATEGORY_FQCN, LocationAwareLogger.DEBUG_INT,
message, null);
}
/**
* Delegates to {@link org.slf4j.Logger#debug(String,Throwable)} method in
* SLF4J.
*/
public void debug(Object message, Throwable t) {
differentiatedLog(null, CATEGORY_FQCN, LocationAwareLogger.DEBUG_INT,
message, t);
}
/**
* Delegates to {@link org.slf4j.Logger#info(String)} method in SLF4J.
*/
public void info(Object message) {
differentiatedLog(null, CATEGORY_FQCN, LocationAwareLogger.INFO_INT,
message, null);
}
/**
* Delegates to {@link org.slf4j.Logger#info(String,Throwable)} method in
* SLF4J.
*/
public void info(Object message, Throwable t) {
differentiatedLog(null, CATEGORY_FQCN, LocationAwareLogger.INFO_INT,
message, t);
}
/**
* Delegates to {@link org.slf4j.Logger#warn(String)} method in SLF4J.
*/
public void warn(Object message) {
differentiatedLog(null, CATEGORY_FQCN, LocationAwareLogger.WARN_INT,
message, null);
}
/**
* Delegates to {@link org.slf4j.Logger#warn(String,Throwable)} method in
* SLF4J.
*/
public void warn(Object message, Throwable t) {
differentiatedLog(null, CATEGORY_FQCN, LocationAwareLogger.WARN_INT,
message, t);
}
/**
* Delegates to {@link org.slf4j.Logger#error(String)} method in SLF4J.
*/
public void error(Object message) {
differentiatedLog(null, CATEGORY_FQCN, LocationAwareLogger.ERROR_INT,
message, null);
}
/**
* Delegates to {@link org.slf4j.Logger#error(String,Throwable)} method in
* SLF4J.
*/
public void error(Object message, Throwable t) {
differentiatedLog(null, CATEGORY_FQCN, LocationAwareLogger.ERROR_INT,
message, t);
}
/**
* Delegates to {@link org.slf4j.Logger#error(String)} method in SLF4J.
*/
public void fatal(Object message) {
differentiatedLog(FATAL_MARKER, CATEGORY_FQCN,
LocationAwareLogger.ERROR_INT, message, null);
}
/**
* Delegates to {@link org.slf4j.Logger#error(String,Throwable)} method in
* SLF4J. In addition, the call is marked with a marker named "FATAL".
*/
public void fatal(Object message, Throwable t) {
differentiatedLog(FATAL_MARKER, CATEGORY_FQCN,
LocationAwareLogger.ERROR_INT, message, t);
}
// See also http://bugzilla.slf4j.org/show_bug.cgi?id=168
public void log(String FQCN, Priority p, Object msg, Throwable t) {
int levelInt = priorityToLevelInt(p);
differentiatedLog(null, FQCN, levelInt, msg, t);
}
public void log(Priority p, Object message, Throwable t) {
int levelInt = priorityToLevelInt(p);
differentiatedLog(null, CATEGORY_FQCN, levelInt, message, t);
}
public void log(Priority p, Object message) {
int levelInt = priorityToLevelInt(p);
differentiatedLog(null, CATEGORY_FQCN, levelInt, message, null);
}
private int priorityToLevelInt(Priority p) {
switch (p.level) {
case Level.TRACE_INT:
return LocationAwareLogger.TRACE_INT;
case Priority.DEBUG_INT:
return LocationAwareLogger.DEBUG_INT;
case Priority.INFO_INT:
return LocationAwareLogger.INFO_INT;
case Priority.WARN_INT:
return LocationAwareLogger.WARN_INT;
case Priority.ERROR_INT:
return LocationAwareLogger.ERROR_INT;
case Priority.FATAL_INT:
return LocationAwareLogger.ERROR_INT;
default:
throw new IllegalStateException("Unknown Priority " + p);
}
}
protected final String convertToString(Object message) {
if (message == null) {
return (String) message;
} else {
return message.toString();
}
}
}