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This module contains the Metro runtime code.
/*
* 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 org.apache.commons.logging.impl;
import java.io.Serializable;
import org.apache.commons.logging.Log;
import org.apache.log4j.Logger;
import org.apache.log4j.Priority;
import org.apache.log4j.Level;
/**
* Implementation of {@link Log} that maps directly to a
* Logger for log4J version 1.2.
*
* Initial configuration of the corresponding Logger instances should be done
* in the usual manner, as outlined in the Log4J documentation.
*
* The reason this logger is distinct from the 1.3 logger is that in version 1.2
* of Log4J:
*
* - class Logger takes Priority parameters not Level parameters.
*
- class Level extends Priority
*
* Log4J1.3 is expected to change Level so it no longer extends Priority, which is
* a non-binary-compatible change. The class generated by compiling this code against
* log4j 1.2 will therefore not run against log4j 1.3.
*
* @version $Id: Log4JLogger.java 1448119 2013-02-20 12:28:04Z tn $
*/
public class Log4JLogger implements Log, Serializable {
/** Serializable version identifier. */
private static final long serialVersionUID = 5160705895411730424L;
// ------------------------------------------------------------- Attributes
/** The fully qualified name of the Log4JLogger class. */
private static final String FQCN = Log4JLogger.class.getName();
/** Log to this logger */
private transient volatile Logger logger = null;
/** Logger name */
private final String name;
private static final Priority traceLevel;
// ------------------------------------------------------------
// Static Initializer.
//
// Note that this must come after the static variable declarations
// otherwise initialiser expressions associated with those variables
// will override any settings done here.
//
// Verify that log4j is available, and that it is version 1.2.
// If an ExceptionInInitializerError is generated, then LogFactoryImpl
// will treat that as meaning that the appropriate underlying logging
// library is just not present - if discovery is in progress then
// discovery will continue.
// ------------------------------------------------------------
static {
if (!Priority.class.isAssignableFrom(Level.class)) {
// nope, this is log4j 1.3, so force an ExceptionInInitializerError
throw new InstantiationError("Log4J 1.2 not available");
}
// Releases of log4j1.2 >= 1.2.12 have Priority.TRACE available, earlier
// versions do not. If TRACE is not available, then we have to map
// calls to Log.trace(...) onto the DEBUG level.
Priority _traceLevel;
try {
_traceLevel = (Priority) Level.class.getDeclaredField("TRACE").get(null);
} catch(Exception ex) {
// ok, trace not available
_traceLevel = Level.DEBUG;
}
traceLevel = _traceLevel;
}
// ------------------------------------------------------------ Constructor
public Log4JLogger() {
name = null;
}
/**
* Base constructor.
*/
public Log4JLogger(String name) {
this.name = name;
this.logger = getLogger();
}
/**
* For use with a log4j factory.
*/
public Log4JLogger(Logger logger) {
if (logger == null) {
throw new IllegalArgumentException(
"Warning - null logger in constructor; possible log4j misconfiguration.");
}
this.name = logger.getName();
this.logger = logger;
}
/**
* Logs a message with org.apache.log4j.Priority.TRACE.
* When using a log4j version that does not support the TRACE
* level, the message will be logged at the DEBUG level.
*
* @param message to log
* @see org.apache.commons.logging.Log#trace(Object)
*/
public void trace(Object message) {
getLogger().log(FQCN, traceLevel, message, null);
}
/**
* Logs a message with org.apache.log4j.Priority.TRACE.
* When using a log4j version that does not support the TRACE
* level, the message will be logged at the DEBUG level.
*
* @param message to log
* @param t log this cause
* @see org.apache.commons.logging.Log#trace(Object, Throwable)
*/
public void trace(Object message, Throwable t) {
getLogger().log(FQCN, traceLevel, message, t);
}
/**
* Logs a message with org.apache.log4j.Priority.DEBUG.
*
* @param message to log
* @see org.apache.commons.logging.Log#debug(Object)
*/
public void debug(Object message) {
getLogger().log(FQCN, Level.DEBUG, message, null);
}
/**
* Logs a message with org.apache.log4j.Priority.DEBUG.
*
* @param message to log
* @param t log this cause
* @see org.apache.commons.logging.Log#debug(Object, Throwable)
*/
public void debug(Object message, Throwable t) {
getLogger().log(FQCN, Level.DEBUG, message, t);
}
/**
* Logs a message with org.apache.log4j.Priority.INFO.
*
* @param message to log
* @see org.apache.commons.logging.Log#info(Object)
*/
public void info(Object message) {
getLogger().log(FQCN, Level.INFO, message, null);
}
/**
* Logs a message with org.apache.log4j.Priority.INFO.
*
* @param message to log
* @param t log this cause
* @see org.apache.commons.logging.Log#info(Object, Throwable)
*/
public void info(Object message, Throwable t) {
getLogger().log(FQCN, Level.INFO, message, t);
}
/**
* Logs a message with org.apache.log4j.Priority.WARN.
*
* @param message to log
* @see org.apache.commons.logging.Log#warn(Object)
*/
public void warn(Object message) {
getLogger().log(FQCN, Level.WARN, message, null);
}
/**
* Logs a message with org.apache.log4j.Priority.WARN.
*
* @param message to log
* @param t log this cause
* @see org.apache.commons.logging.Log#warn(Object, Throwable)
*/
public void warn(Object message, Throwable t) {
getLogger().log(FQCN, Level.WARN, message, t);
}
/**
* Logs a message with org.apache.log4j.Priority.ERROR.
*
* @param message to log
* @see org.apache.commons.logging.Log#error(Object)
*/
public void error(Object message) {
getLogger().log(FQCN, Level.ERROR, message, null);
}
/**
* Logs a message with org.apache.log4j.Priority.ERROR.
*
* @param message to log
* @param t log this cause
* @see org.apache.commons.logging.Log#error(Object, Throwable)
*/
public void error(Object message, Throwable t) {
getLogger().log(FQCN, Level.ERROR, message, t);
}
/**
* Logs a message with org.apache.log4j.Priority.FATAL.
*
* @param message to log
* @see org.apache.commons.logging.Log#fatal(Object)
*/
public void fatal(Object message) {
getLogger().log(FQCN, Level.FATAL, message, null);
}
/**
* Logs a message with org.apache.log4j.Priority.FATAL.
*
* @param message to log
* @param t log this cause
* @see org.apache.commons.logging.Log#fatal(Object, Throwable)
*/
public void fatal(Object message, Throwable t) {
getLogger().log(FQCN, Level.FATAL, message, t);
}
/**
* Return the native Logger instance we are using.
*/
public Logger getLogger() {
Logger result = logger;
if (result == null) {
synchronized(this) {
result = logger;
if (result == null) {
logger = result = Logger.getLogger(name);
}
}
}
return result;
}
/**
* Check whether the Log4j Logger used is enabled for DEBUG priority.
*/
public boolean isDebugEnabled() {
return getLogger().isDebugEnabled();
}
/**
* Check whether the Log4j Logger used is enabled for ERROR priority.
*/
public boolean isErrorEnabled() {
return getLogger().isEnabledFor(Level.ERROR);
}
/**
* Check whether the Log4j Logger used is enabled for FATAL priority.
*/
public boolean isFatalEnabled() {
return getLogger().isEnabledFor(Level.FATAL);
}
/**
* Check whether the Log4j Logger used is enabled for INFO priority.
*/
public boolean isInfoEnabled() {
return getLogger().isInfoEnabled();
}
/**
* Check whether the Log4j Logger used is enabled for TRACE priority.
* When using a log4j version that does not support the TRACE level, this call
* will report whether DEBUG is enabled or not.
*/
public boolean isTraceEnabled() {
return getLogger().isEnabledFor(traceLevel);
}
/**
* Check whether the Log4j Logger used is enabled for WARN priority.
*/
public boolean isWarnEnabled() {
return getLogger().isEnabledFor(Level.WARN);
}
}