/** URL codec for encoding and decoding URL parameters */
    protected URLCodec urlCodec = new URLCodec();

    /**
     * Default constructor for EncodingFilter.
     */
    public EncodingFilter() {
        // Default constructor
    }

    /**
     * Initializes the filter with configuration parameters.
     * Sets up encoding mappings and default encoding from filter configuration.

  <!--                                                                    ============== -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.codelibs.fess.filter.EncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>