Class LoggerWrapper

slf4j-ext/src/main/java/org/slf4j/ext/LoggerWrapper.java:40–813

A helper class wrapping an org.slf4j.Logger instance preserving location information if the wrapped instance supports it. @author Ralph Goers @author Ceki Gülcü

 * @author Ceki Gülcü
 */
public class LoggerWrapper implements Logger {

    // To ensure consistency between two instances sharing the same name
    // (homonyms) a LoggerWrapper should not contain any state beyond
    // the Logger instance it wraps.
    // Note that 'instanceofLAL' directly depends on Logger.
    // fqcn depend on the caller, but its value would not be different
    // between successive invocations of a factory class

    protected final Logger logger;
    final String fqcn;
    // is this logger instance a LocationAwareLogger
    protected final boolean instanceofLAL;

    public LoggerWrapper(Logger logger, String fqcn) {
        this.logger = logger;
        this.fqcn = fqcn;
        if (logger instanceof LocationAwareLogger) {
            instanceofLAL = true;
        } else {
            instanceofLAL = false;
        }
    }

    /**
     * Delegate to the appropriate method of the underlying logger.
     */
    public boolean isTraceEnabled() {
        return logger.isTraceEnabled();
    }

    /**
     * Delegate to the appropriate method of the underlying logger.
     */
    public boolean isTraceEnabled(Marker marker) {
        return logger.isTraceEnabled(marker);
    }

    /**
     * Delegate to the appropriate method of the underlying logger.
     */
    public void trace(String msg) {
        if (!logger.isTraceEnabled())
            return;

        if (instanceofLAL) {
            ((LocationAwareLogger) logger).log(null, fqcn, LocationAwareLogger.TRACE_INT, msg, null, null);
        } else {
            logger.trace(msg);
        }
    }

    /**
     * Delegate to the appropriate method of the underlying logger.
     */
    public void trace(String format, Object arg) {
        if (!logger.isTraceEnabled())
            return;