import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.LoggerContext;
import org.slf4j.LoggerFactory;

import java.util.Arrays;
import java.util.List;

public class LogUtils
{
    private final static List VALID_LEVELS = Arrays.asList( "TRACE", "DEBUG", "INFO", "WARN", "ERROR" );

    public static void setLogLevel( String packageName, String logLevel )
    {
        LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();

        ch.qos.logback.classic.Logger logger = loggerContext.getLogger( packageName );
        System.out.println( packageName + " current logger level: " + logger.getLevel() );
        System.out.println( " You entered: " + logLevel );

        if ( VALID_LEVELS.contains( logLevel ) )
        {
            logger.setLevel( Level.toLevel( logLevel ) );
        }
    }
}