this.logger = requireNonNull(logger);
    }

    public void debug(CharSequence content) {
        if (isDebugEnabled()) {
            logger.debug(toString(content));
        }
    }

    @Override
    public void debug(CharSequence content, Throwable error) {
        if (isDebugEnabled()) {
            logger.debug(toString(content), error);
        }
    }

    @Override

        Exception e = event.getException();
        if (e != null) {
            if (e instanceof MetadataNotFoundException) {
                logger.debug(e.getMessage());
            } else if (logger.isDebugEnabled()) {
                logger.warn(e.getMessage(), e);
            } else {
                logger.warn(e.getMessage());
            }
        }
    }

    @Override

            final Throwable cause = e.getCause();
            if (cause != null && "VersionConflictEngineException".equals(cause.getClass().getSimpleName())) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Failed to insert {}", urlQueue, e);
                }
                return;
            }
            throw e;
        }
    }

    @Override

    public void trace(Marker marker, String format, Object... argArray) {}

    public void trace(Marker marker, String msg, Throwable t) {}

    public boolean isDebugEnabled() {
        return false;
    }

    public void debug(String msg) {}

    public void debug(String format, Object arg) {}

    public void debug(String format, Object arg1, Object arg2) {}

        if (!policy.isEnabled()) {
            if (getLogger().isDebugEnabled()) {
                getLogger()
                        .debug("Skipping update check for " + artifact + " (" + file + ") from " + repository.getId()
                                + " (" + repository.getUrl() + ")");
            }

            return false;
        }

        if (getLogger().isDebugEnabled()) {
            getLogger()

                boolean update;

                if (!policy.isEnabled()) {
                    update = false;

                    if (getLogger().isDebugEnabled()) {
                        getLogger()
                                .debug("Skipping update check for " + metadata.getKey() + " (" + file

            if (logger.isDebugEnabled()) {
                logger.debug("{} -> {}", attrValue, u);
            }
            if (StringUtil.isNotBlank(u)) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Add Child: {}", u);
                }
                urlList.add(u);
            } else if (logger.isDebugEnabled()) {
                logger.debug("Skip Child: {}", u);

            return;
        }

        if (logger.isDebugEnabled()) {
            logger.debug("{} -> {}", attrValue, u);
        }
        if (StringUtil.isNotBlank(u)) {
            if (logger.isDebugEnabled()) {
                logger.debug("Add Child: {}", u);
            }
            urlList.add(u);
        } else if (logger.isDebugEnabled()) {
            logger.debug("Skip Child: {}", u);
        }

        logger.debug(message);
    }

    public void debug(String message, Throwable throwable) {
        setMdc();
        logger.debug(message, throwable);
    }

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

    public void info(String message) {
        setMdc();
        logger.info(message);
    }

    public void info(String message, Throwable throwable) {
        setMdc();

        error.printStackTrace(pWriter);

        System.err.println("[error] " + sWriter.toString());
    }

    /**
     * @see org.apache.maven.plugin.logging.Log#isDebugEnabled()
     */
    public boolean isDebugEnabled() {
        // TODO Not sure how best to set these for this implementation...
        return false;
    }

    /**
     * @see org.apache.maven.plugin.logging.Log#isInfoEnabled()