public ParamEncoder(String idAttribute) 
{
                           
        // use name and id to get the unique identifier
        String stringIdentifier = "x-" + idAttribute; //$NON-NLS-1$
        // get the array
        char[] charArray = stringIdentifier.toCharArray();
        // calculate a simple checksum-like value
        int checkSum = 17;
        for (int j = 0; j <  charArray.length; j++)
        {
            checkSum = 3 * checkSum + charArray[j];
        }
        // keep it positive
        checkSum &= 0x7fffff;
        // this is the full identifier used for all the parameters
        this.parameterIdentifier = "d-" + checkSum + "-"; //$NON-NLS-1$ //$NON-NLS-2$
}

Generates a new parameter encoder for the table with the given id.

Parameters:

idAttribute - value of "id" attribute

 public String encodeParameterName(String paramName) 
{
        return this.parameterIdentifier + paramName;
}

encode a parameter name prepending calculated parameterIdentifier.

 public boolean isParameterEncoded(String paramName) 
{
        return paramName != null && paramName.startsWith(this.parameterIdentifier);
}

Check if the given parameter has been encoded using paramEncoder. It actually check if the parameter name starts with the calculated parameterIdentifier. Null safe (a null string returns false).