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/*
 * 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.commons.logging.impl;

import java.io.Serializable;
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 ancesteral Avalon logger for this class. Any AvalonLogger * instances created through the LogFactory mechanisms will output * to child loggers of this Logger. *
  • *
* * @author Neeme Praks * @version $Revision: 1.9 $ $Date: 2004/06/01 19:56:20 $ */ public class AvalonLogger implements Log, Serializable { /** Ancesteral avalon logger */ private static Logger defaultLogger = null; /** Avalon logger used to perform log */ private transient Logger logger = null; /** The name of this logger */ private String name = null; /** * Constructs an AvalonLogger that outputs to the given * Logger instance. * @param logger the avalon logger implementation to delegate to */ public AvalonLogger(Logger logger) { this.name = name; 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 = getLogger(); } /** * Gets the Avalon logger implementation used to perform logging. * @return avalon logger implementation */ public Logger getLogger() { if (logger == null) { logger = defaultLogger.getChildLogger(name); } return logger; } /** * Sets the ancesteral 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; } /** * @see org.apache.commons.logging.Log#debug(java.lang.Object, java.lang.Throwable) */ public void debug(Object o, Throwable t) { if (getLogger().isDebugEnabled()) getLogger().debug(String.valueOf(o), t); } /** * @see org.apache.commons.logging.Log#debug(java.lang.Object) */ public void debug(Object o) { if (getLogger().isDebugEnabled()) getLogger().debug(String.valueOf(o)); } /** * @see org.apache.commons.logging.Log#error(java.lang.Object, java.lang.Throwable) */ public void error(Object o, Throwable t) { if (getLogger().isErrorEnabled()) getLogger().error(String.valueOf(o), t); } /** * @see org.apache.commons.logging.Log#error(java.lang.Object) */ public void error(Object o) { if (getLogger().isErrorEnabled()) getLogger().error(String.valueOf(o)); } /** * @see org.apache.commons.logging.Log#fatal(java.lang.Object, java.lang.Throwable) */ public void fatal(Object o, Throwable t) { if (getLogger().isFatalErrorEnabled()) getLogger().fatalError(String.valueOf(o), t); } /** * @see org.apache.commons.logging.Log#fatal(java.lang.Object) */ public void fatal(Object o) { if (getLogger().isFatalErrorEnabled()) getLogger().fatalError(String.valueOf(o)); } /** * @see org.apache.commons.logging.Log#info(java.lang.Object, java.lang.Throwable) */ public void info(Object o, Throwable t) { if (getLogger().isInfoEnabled()) getLogger().info(String.valueOf(o), t); } /** * @see org.apache.commons.logging.Log#info(java.lang.Object) */ public void info(Object o) { if (getLogger().isInfoEnabled()) getLogger().info(String.valueOf(o)); } /** * @see org.apache.commons.logging.Log#isDebugEnabled() */ public boolean isDebugEnabled() { return getLogger().isDebugEnabled(); } /** * @see org.apache.commons.logging.Log#isErrorEnabled() */ public boolean isErrorEnabled() { return getLogger().isErrorEnabled(); } /** * @see org.apache.commons.logging.Log#isFatalEnabled() */ public boolean isFatalEnabled() { return getLogger().isFatalErrorEnabled(); } /** * @see org.apache.commons.logging.Log#isInfoEnabled() */ public boolean isInfoEnabled() { return getLogger().isInfoEnabled(); } /** * @see org.apache.commons.logging.Log#isTraceEnabled() */ public boolean isTraceEnabled() { return getLogger().isDebugEnabled(); } /** * @see org.apache.commons.logging.Log#isWarnEnabled() */ public boolean isWarnEnabled() { return getLogger().isWarnEnabled(); } /** * @see org.apache.commons.logging.Log#trace(java.lang.Object, java.lang.Throwable) */ public void trace(Object o, Throwable t) { if (getLogger().isDebugEnabled()) getLogger().debug(String.valueOf(o), t); } /** * @see org.apache.commons.logging.Log#trace(java.lang.Object) */ public void trace(Object o) { if (getLogger().isDebugEnabled()) getLogger().debug(String.valueOf(o)); } /** * @see org.apache.commons.logging.Log#warn(java.lang.Object, java.lang.Throwable) */ public void warn(Object o, Throwable t) { if (getLogger().isWarnEnabled()) getLogger().warn(String.valueOf(o), t); } /** * @see org.apache.commons.logging.Log#warn(java.lang.Object) */ public void warn(Object o) { if (getLogger().isWarnEnabled()) getLogger().warn(String.valueOf(o)); } }


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