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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.apache.commons.logging.internal;

import org.apache.commons.logging.Log;
import org.osgi.framework.BundleContext;
import org.ops4j.pax.logging.PaxLogger;
import org.ops4j.pax.logging.PaxLoggingManager;

public class JclLogger
    implements Log
{

    public static final String JCL_FQCN = JclLogger.class.getName();
    
    private PaxLogger m_delegate;

    public JclLogger( PaxLogger delegate )
    {
        m_delegate = delegate;
    }

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

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

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

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

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

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

    public void trace( Object message )
    {
        if( m_delegate.isTraceEnabled() && message != null )
        {
            m_delegate.trace( message.toString(), null );
        }
    }

    public void trace( Object message, Throwable t )
    {
      if (m_delegate.isTraceEnabled()) {

        if( message != null )
        {
            m_delegate.trace( message.toString(), t );
        }
        else
        {
            m_delegate.trace( null, t );
        }
      }
    }

    public void debug( Object message )
    {
        if( m_delegate.isDebugEnabled() && message != null )
        {
            m_delegate.debug( message.toString(), null );
        }
    }

    public void debug( Object message, Throwable t )
    {
      if (m_delegate.isDebugEnabled()) {

        if( message != null )
        {
            m_delegate.debug( message.toString(), t );
        }
        else
        {
            m_delegate.debug( null, t );
        }
      }
    }

    public void info( Object message )
    {
        if( m_delegate.isInfoEnabled() && message != null )
        {
            m_delegate.inform( message.toString(), null );
        }
    }

    public void info( Object message, Throwable t )
    {
      if (m_delegate.isInfoEnabled()) {

        if( message != null )
        {
            m_delegate.inform( message.toString(), t );
        }
        else
        {
            m_delegate.inform( null, t );
        }
      }

    }

    public void warn( Object message )
    {
        if( m_delegate.isWarnEnabled() && message != null )
        {
            m_delegate.warn( message.toString(), null );
        }
    }

    public void warn( Object message, Throwable t )
    {
      if (m_delegate.isWarnEnabled()) {
        if( message != null )
        {
            m_delegate.warn( message.toString(), t );
        }
        else
        {
            m_delegate.warn( null, t );
        }
      }
    }

    public void error( Object message )
    {
        if( m_delegate.isErrorEnabled() && message != null )
        {
            m_delegate.error( message.toString(), null );
        }

    }

    public void error( Object message, Throwable t )
    {
      if (m_delegate.isErrorEnabled()) {
        if( message != null )
        {
            m_delegate.error( message.toString(), t );
        }
        else
        {
            m_delegate.error( null, t );
        }
      }
    }

    public void fatal( Object message )
    {
        if( m_delegate.isFatalEnabled() && message != null )
        {
            m_delegate.fatal( message.toString(), null );
        }
    }

    public void fatal( Object message, Throwable t )
    {
      if (m_delegate.isFatalEnabled()) {

        if( message != null )
        {
            m_delegate.fatal( message.toString(), t );
        }
        else
        {
            m_delegate.fatal( null, t );
        }
      }
    }

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

    public void setBundleContext( BundleContext context )
    {
    }

    /**
     * Not a public method.
     *
     * @param paxLoggingManager TODO
     * @param name TODO
     */
    public void setPaxLoggingManager( PaxLoggingManager paxLoggingManager, String name )
    {
        m_delegate = paxLoggingManager.getLogger( name, JCL_FQCN );
    }
}