if (logger.isDebugEnabled()) {
            logger.debug("Initializing {}", this.getClass().getSimpleName());
        }
        fessConfig = ComponentUtil.getFessConfig();
        dataSerializer = ComponentUtil.getComponent("dataSerializer");
    }

    /**
     * Gets the Fess configuration instance.
     *
     * @return the Fess configuration
     */
    @Override
    public FessConfig getFessConfig() {

        if (logger.isDebugEnabled()) {
            logger.debug("Initializing {}", this.getClass().getSimpleName());
        }
        fessConfig = ComponentUtil.getFessConfig();
        dataSerializer = ComponentUtil.getComponent("dataSerializer");
    }

    /**
     * Gets the Fess configuration instance.
     *
     * @return the Fess configuration
     */
    @Override
    public FessConfig getFessConfig() {

    /**
     * The Fess configuration.
     */
    protected FessConfig fessConfig;

    /**
     * The data serializer.
     */
    protected DataSerializer dataSerializer;

    /**
     * Get the extractor.
     * @param responseData The response data.
     * @return The extractor.
     */
    protected abstract Extractor getExtractor(ResponseData responseData);

                if (data != null) {
                    try {
                        final DataSerializer dataSerializer = ComponentUtil.getComponent("dataSerializer");
                        @SuppressWarnings("unchecked")
                        final Map<String, Object> responseDataMap = (Map<String, Object>) dataSerializer.fromBinaryToObject(data);
                        return responseDataMap;

                            try {
                                final DataSerializer dataSerializer = ComponentUtil.getComponent("dataSerializer");
                                @SuppressWarnings("unchecked")
                                final Map<String, Object> responseDataMap = (Map<String, Object>) dataSerializer.fromBinaryToObject(data);
                                mergeResponseData(dataMap, responseDataMap);

    /** Fess configuration instance */
    protected FessConfig fessConfig;

    /** Data serializer for converting objects to binary format */
    protected DataSerializer dataSerializer;

    /** Flag indicating whether to process Google on/off comments */
    protected boolean useGoogleOffOn = true;

    /** Map storing field pruning rules */