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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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.commons.logging.impl;

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogConfigurationException;
import org.apache.commons.logging.LogFactory;
import org.apache.log4j.Logger;


Concrete subclass of {@link LogFactory} specific to log4j. * * @deprecated Per discussion on COMMONS-DEV, the behind-the-scenes use * of this class as a proxy factory has been removed. For 1.0, you * can still request it directly if you wish, but it doesn't really * do anything useful, and will be removed in 1.1. * * @author Costin Manolache */ public final class Log4jFactory extends LogFactory { public Log4jFactory() { super(); } /** * The configuration attributes for this {@link LogFactory}. */ private Hashtable attributes = new Hashtable(); // Previously returned instances, to avoid creation of proxies private Hashtable instances = new Hashtable(); // --------------------------------------------------------- Public Methods /** * Return the configuration attribute with the specified name (if any), * or null if there is no such attribute. * * @param name Name of the attribute to return */ public Object getAttribute(String name) { return (attributes.get(name)); } /** * Return an array containing the names of all currently defined * configuration attributes. If there are no such attributes, a zero * length array is returned. */ public String[] getAttributeNames() { Vector names = new Vector(); Enumeration keys = attributes.keys(); while (keys.hasMoreElements()) { names.addElement((String) keys.nextElement()); } String results[] = new String[names.size()]; for (int i = 0; i < results.length; i++) { results[i] = (String) names.elementAt(i); } return (results); } /** * Convenience method to derive a name from the specified class and * call getInstance(String) with it. * * @param clazz Class for which a suitable Log name will be derived * * @exception LogConfigurationException if a suitable Log * instance cannot be returned */ public Log getInstance(Class clazz) throws LogConfigurationException { Log instance = (Log) instances.get(clazz); if( instance != null ) return instance; instance=new Log4JLogger( Logger.getLogger( clazz )); instances.put( clazz, instance ); return instance; } public Log getInstance(String name) throws LogConfigurationException { Log instance = (Log) instances.get(name); if( instance != null ) return instance; instance=new Log4JLogger( Logger.getLogger( name )); instances.put( name, instance ); return instance; } /** * Release any internal references to previously created {@link Log} * instances returned by this factory. This is useful in environments * like servlet containers, which implement application reloading by * throwing away a ClassLoader. Dangling references to objects in that * class loader would prevent garbage collection. */ public void release() { instances.clear(); // what's the log4j mechanism to cleanup ??? } /** * Remove any configuration attribute associated with the specified name. * If there is no such attribute, no action is taken. * * @param name Name of the attribute to remove */ public void removeAttribute(String name) { attributes.remove(name); } /** * Set the configuration attribute with the specified name. Calling * this with a null value is equivalent to calling * removeAttribute(name). * * @param name Name of the attribute to set * @param value Value of the attribute to set, or null * to remove any setting for this attribute */ public void setAttribute(String name, Object value) { if (value == null) { attributes.remove(name); } else { attributes.put(name, value); } } }

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