import org.apache.log4j.PatternLayout;
import org.apache.log4j.spi.LoggingEvent;

import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

	public class FilterLayout extends PatternLayout {
	private static final String MASK = "eu.dell";
	private static final Pattern PATTERN = Pattern.compile("(eu.storware)");

	@Override
	public String format(LoggingEvent event) {
		if (event.getMessage() instanceof String) {
			String message = event.getRenderedMessage();
			Matcher matcher = PATTERN.matcher(message);

			if (matcher.find()) {
				String maskedMessage = matcher.replaceAll(MASK);
				return maskedMessage + "\n";
			}
		}
		return super.format(event);
	}
}