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/*
 * 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); } }




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