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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.

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/*  Copyright 2007 Niclas Hedhman.
 *
 * 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.ops4j.pax.logging.internal;


import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.ops4j.pax.logging.slf4j.Slf4jLoggerFactory;
import org.ops4j.pax.logging.slf4j.Slf4jMDCAdapter;

public class Activator
    implements BundleActivator
{

    public void start( BundleContext bundleContext )
        throws Exception
    {
        org.ops4j.pax.logging.slf4j.Slf4jLoggerFactory.setBundleContext( bundleContext );
        String name = getClass().getName();
        org.slf4j.Logger slf4jLogger = org.slf4j.LoggerFactory.getLogger( name );
        Slf4jMDCAdapter.setBundleContext(bundleContext);
        slf4jLogger.info( "Enabling SLF4J API support." );
        org.apache.commons.logging.LogFactory.setBundleContext( bundleContext );
        org.apache.commons.logging.Log commonsLogger = org.apache.commons.logging.LogFactory.getLog( name );
        commonsLogger.info( "Enabling Jakarta Commons Logging API support." );
        org.apache.log4j.Logger.setBundleContext( bundleContext );
        org.apache.log4j.MDC.setBundleContext( bundleContext );
        org.apache.log4j.Logger log4jLogger = org.apache.log4j.Logger.getLogger( name );
        log4jLogger.info( "Enabling Log4J API support." );
        org.ops4j.pax.logging.avalon.AvalonLogFactory.setBundleContext( bundleContext );
        org.apache.avalon.framework.logger.Logger avalonLogger = org.ops4j.pax.logging.avalon.AvalonLogFactory.getLogger( name );
        avalonLogger.info( "Enabling Avalon Logger API support." );
        
        org.apache.juli.logging.LogFactory.setBundleContext( bundleContext );
        org.apache.juli.logging.Log juliLogger = org.apache.juli.logging.LogFactory.getLog( name );
        juliLogger.info( "Enabling JULI Logger API support." );
    }

    public void stop( BundleContext bundleContext )
        throws Exception
    {
        String name = getClass().getName();

        org.slf4j.Logger slf4jLogger = org.slf4j.LoggerFactory.getLogger( name );
        slf4jLogger.info( "Disabling SLF4J API support." );

        org.apache.commons.logging.Log commonsLogger = org.apache.commons.logging.LogFactory.getLog( name );
        commonsLogger.info( "Disabling Jakarta Commons Logging API support." );

        org.apache.log4j.Logger log4jLogger = org.apache.log4j.Logger.getLogger( name );
        log4jLogger.info( "Disabling Log4J API support." );

        org.apache.avalon.framework.logger.Logger avalonLogger = org.ops4j.pax.logging.avalon.AvalonLogFactory.getLogger( name );
        avalonLogger.info( "Disabling Avalon Logger API support." );

        org.apache.juli.logging.Log juliLogger = org.apache.juli.logging.LogFactory.getLog( name );
        juliLogger.info( "Disabling JULI Logger API support." );

        org.ops4j.pax.logging.slf4j.Slf4jLoggerFactory.dispose();
        Slf4jMDCAdapter.dispose();
        org.apache.commons.logging.LogFactory.dispose();
        org.apache.log4j.Logger.dispose();
        org.apache.log4j.MDC.dispose();
        org.ops4j.pax.logging.avalon.AvalonLogFactory.dispose();
        org.apache.juli.logging.LogFactory.dispose();
    }
}