/*   
 *  Copyright 1999-2004 The Apache Sofware 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.tomcat.util.log;

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


/**
 * Allows the control the log properties at runtime.
 * Normal applications will just use Log, without having to
 * deal with the way the log is configured or managed.
 *
 *
 * @author Alex Chaffee [alex@jguru.com]
 * @author Costin Manolache
 **/
public class LogManager {

    //static LogHandler defaultChannel=new LogHandler();
    static LogHandler defaultChannel=new CommonLogHandler();
    
    protected Hashtable loggers=new Hashtable();
    protected Hashtable channels=new Hashtable();

    public  Hashtable getLoggers() {
	return loggers;
    }

    public Hashtable getChannels() {
	return channels;
    }
    
    public static void setDefault( LogHandler l ) {
	if( defaultChannel==null)
	    defaultChannel=l;
    }

    public void addChannel( String name, LogHandler logH ) {
	if(name==null) name="";

	channels.put( name, logH );
	Enumeration enum=loggers.keys();
	while( enum.hasMoreElements() ) {
	    String k=(String)enum.nextElement();
	    Log l=(Log)loggers.get( k );
	    if( name.equals( l.getChannel( this ) )) {
		l.setProxy( this, logH );
	    }
	}
    }
    
    /** Default method to create a log facade.
     */
    public Log getLog( String channel, String prefix,
		       Object owner ) {
	if( prefix==null && owner!=null ) {
	    String cname = owner.getClass().getName();
	    prefix = cname.substring( cname.lastIndexOf(".") +1);
	}

	LogHandler proxy=(LogHandler)channels.get(channel);
	if( proxy==null ) proxy=defaultChannel;
	
	// user-level loggers
	Log log=new Log( channel, prefix, proxy, owner );
	loggers.put( channel + ":" + prefix, log );
	if( dL > 0 )
	    System.out.println("getLog facade " + channel + ":" + prefix);
	return log;
    }

    private static int dL=0;

}