import org.apache.log4j.WriterAppender;
import org.apache.log4j.spi.LoggingEvent;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Text;

public class SwtTextAppenderLog4J extends WriterAppender
{

    private static Text text;
    private static Display display;
        
    static public void set(Display display, Text text)
    {
        SwtTextAppenderLog4J.display = display;
        SwtTextAppenderLog4J.text = text;
    }

    public void append(LoggingEvent loggingEvent)
    {
        if(text == null || display == null)
        {
            return;
        }
        
        final String mes = (String) loggingEvent.getMessage();

        display.asyncExec(new Runnable()
        {
            
            @Override
            public void run()
            {
                if(text != null)
                {
                    text.append(mes + "\n");
                } 
            }
        });
    }

}