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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 2006 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.ops4j.pax.logging.PaxLogger;
import org.ops4j.pax.logging.PaxContext;
import org.ops4j.pax.logging.PaxLogger;
import org.ops4j.pax.logging.PaxLoggingService;
import org.osgi.framework.Bundle;

public class TrackingLogger
        implements PaxLogger
{

    private PaxLoggingService m_service;
    private String m_category;
    private Bundle m_bundle;
    private PaxLogger m_delegate;
    private String m_fqcn;

    public TrackingLogger( PaxLoggingService service, String category, Bundle bundle, String fqcn )
    {
        m_fqcn = fqcn;
        m_category = category;
        m_bundle = bundle;
        added( service );
    }

    public boolean isTraceEnabled()
    {
        return m_delegate.isTraceEnabled();
    }

    public boolean isDebugEnabled()
    {
        return m_delegate.isDebugEnabled();
    }

    public boolean isWarnEnabled()
    {
        return m_delegate.isWarnEnabled();
    }

    public boolean isInfoEnabled()
    {
        return m_delegate.isInfoEnabled();
    }

    public boolean isErrorEnabled()
    {
        return m_delegate.isErrorEnabled();
    }

    public boolean isFatalEnabled()
    {
        return m_delegate.isFatalEnabled();
    }

    public void trace( String message, Throwable t )
    {
        m_delegate.trace( message, t );
    }

    public void debug( String message, Throwable t )
    {
        m_delegate.debug( message, t );
    }

    public void inform( String message, Throwable t )
    {
        m_delegate.inform( message, t );
    }

    public void warn( String message, Throwable t )
    {
        m_delegate.warn( message, t );
    }

    public void error( String message, Throwable t )
    {
        m_delegate.error( message, t );
    }

    public void fatal( String message, Throwable t )
    {
        m_delegate.fatal( message, t );
    }

    public void trace( String message, Throwable t, String fqcn )
    {
        m_delegate.trace( message, t, fqcn );
    }

    public void debug( String message, Throwable t, String fqcn  )
    {
        m_delegate.debug( message, t, fqcn );
    }

    public void inform( String message, Throwable t, String fqcn )
    {
        m_delegate.inform( message, t, fqcn );
    }

    public void warn( String message, Throwable t, String fqcn )
    {
        m_delegate.warn( message, t, fqcn );
    }

    public void error( String message, Throwable t, String fqcn )
    {
        m_delegate.error( message, t, fqcn );
    }

    public void fatal( String message, Throwable t, String fqcn )
    {
        m_delegate.fatal( message, t, fqcn );
    }

    public int getLogLevel()
    {
        return m_delegate.getLogLevel();
    }

    public String getName()
    {
        return m_delegate.getName();
    }

    public void added( PaxLoggingService service )
    {
        m_service = service;
        if( m_service != null )
        {
            m_delegate = m_service.getLogger( m_bundle, m_category, m_fqcn );
        }
        else
        {
            m_delegate = new DefaultServiceLog( m_bundle, m_category );
        }
    }

    /**
     * Called by the tracker when there is no service available, and the reference should
     * be dropped.
     */
    public void removed()
    {
        m_service = null;
        m_delegate = new DefaultServiceLog( m_bundle, m_category );
    }
    
    public PaxContext getPaxContext() {
        if (m_service != null) {
            return m_service.getPaxContext();
        } else {
            return m_delegate.getPaxContext();
        }
    }
}