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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 org.apache.avalon.framework.logger.Logger;
import org.apache.commons.logging.Log;

/**
 * Implementation of commons-logging Log interface that delegates all
 * logging calls to the Avalon logging abstraction: the Logger interface.
 * 

* There are two ways in which this class can be used: *

    *
  • the instance can be constructed with an Avalon logger * (by calling {@link #AvalonLogger(Logger)}). In this case, it acts * as a simple thin wrapping implementation over the logger. This is * particularly useful when using a property setter. *
  • *
  • the {@link #setDefaultLogger} class property can be called which * sets the ancestral Avalon logger for this class. Any AvalonLogger * instances created through the LogFactory mechanisms will output * to child loggers of this Logger. *
  • *
*

* Note: AvalonLogger does not implement Serializable * because the constructors available for it make this impossible to achieve in all * circumstances; there is no way to "reconnect" to an underlying Logger object on * deserialization if one was just passed in to the constructor of the original * object. This class was marked Serializable in the 1.0.4 release of * commons-logging, but this never actually worked (a NullPointerException would * be thrown as soon as the deserialized object was used), so removing this marker * is not considered to be an incompatible change. * * @version $Id: AvalonLogger.java 1435115 2013-01-18 12:40:19Z tn $ */ public class AvalonLogger implements Log { /** Ancestral Avalon logger. */ private static volatile Logger defaultLogger = null; /** Avalon logger used to perform log. */ private final transient Logger logger; /** * Constructs an AvalonLogger that outputs to the given * Logger instance. * * @param logger the Avalon logger implementation to delegate to */ public AvalonLogger(Logger logger) { this.logger = logger; } /** * Constructs an AvalonLogger that will log to a child * of the Logger set by calling {@link #setDefaultLogger}. * * @param name the name of the avalon logger implementation to delegate to */ public AvalonLogger(String name) { if (defaultLogger == null) { throw new NullPointerException("default logger has to be specified if this constructor is used!"); } this.logger = defaultLogger.getChildLogger(name); } /** * Gets the Avalon logger implementation used to perform logging. * * @return avalon logger implementation */ public Logger getLogger() { return logger; } /** * Sets the ancestral Avalon logger from which the delegating loggers will descend. * * @param logger the default avalon logger, * in case there is no logger instance supplied in constructor */ public static void setDefaultLogger(Logger logger) { defaultLogger = logger; } /** * Logs a message with org.apache.avalon.framework.logger.Logger.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) { if (getLogger().isDebugEnabled()) { getLogger().debug(String.valueOf(message), t); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.debug. * * @param message to log. * @see org.apache.commons.logging.Log#debug(Object) */ public void debug(Object message) { if (getLogger().isDebugEnabled()) { getLogger().debug(String.valueOf(message)); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.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) { if (getLogger().isErrorEnabled()) { getLogger().error(String.valueOf(message), t); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.error. * * @param message to log * @see org.apache.commons.logging.Log#error(Object) */ public void error(Object message) { if (getLogger().isErrorEnabled()) { getLogger().error(String.valueOf(message)); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.fatalError. * * @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) { if (getLogger().isFatalErrorEnabled()) { getLogger().fatalError(String.valueOf(message), t); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.fatalError. * * @param message to log * @see org.apache.commons.logging.Log#fatal(Object) */ public void fatal(Object message) { if (getLogger().isFatalErrorEnabled()) { getLogger().fatalError(String.valueOf(message)); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.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) { if (getLogger().isInfoEnabled()) { getLogger().info(String.valueOf(message), t); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.info. * * @param message to log * @see org.apache.commons.logging.Log#info(Object) */ public void info(Object message) { if (getLogger().isInfoEnabled()) { getLogger().info(String.valueOf(message)); } } /** * Is logging to org.apache.avalon.framework.logger.Logger.debug enabled? * @see org.apache.commons.logging.Log#isDebugEnabled() */ public boolean isDebugEnabled() { return getLogger().isDebugEnabled(); } /** * Is logging to org.apache.avalon.framework.logger.Logger.error enabled? * @see org.apache.commons.logging.Log#isErrorEnabled() */ public boolean isErrorEnabled() { return getLogger().isErrorEnabled(); } /** * Is logging to org.apache.avalon.framework.logger.Logger.fatalError enabled? * @see org.apache.commons.logging.Log#isFatalEnabled() */ public boolean isFatalEnabled() { return getLogger().isFatalErrorEnabled(); } /** * Is logging to org.apache.avalon.framework.logger.Logger.info enabled? * @see org.apache.commons.logging.Log#isInfoEnabled() */ public boolean isInfoEnabled() { return getLogger().isInfoEnabled(); } /** * Is logging to org.apache.avalon.framework.logger.Logger.debug enabled? * @see org.apache.commons.logging.Log#isTraceEnabled() */ public boolean isTraceEnabled() { return getLogger().isDebugEnabled(); } /** * Is logging to org.apache.avalon.framework.logger.Logger.warn enabled? * @see org.apache.commons.logging.Log#isWarnEnabled() */ public boolean isWarnEnabled() { return getLogger().isWarnEnabled(); } /** * Logs a message with org.apache.avalon.framework.logger.Logger.debug. * * @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) { if (getLogger().isDebugEnabled()) { getLogger().debug(String.valueOf(message), t); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.debug. * * @param message to log * @see org.apache.commons.logging.Log#trace(Object) */ public void trace(Object message) { if (getLogger().isDebugEnabled()) { getLogger().debug(String.valueOf(message)); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.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) { if (getLogger().isWarnEnabled()) { getLogger().warn(String.valueOf(message), t); } } /** * Logs a message with org.apache.avalon.framework.logger.Logger.warn. * * @param message to log * @see org.apache.commons.logging.Log#warn(Object) */ public void warn(Object message) { if (getLogger().isWarnEnabled()) { getLogger().warn(String.valueOf(message)); } } }





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