final <t> ConvertibleType<t> param(final int index) {
        return this.params.length > index ? (ConvertibleType<t>)this.params[index] : null;
    }
final < t > ConvertibleType < t > param ( final int index ) { return this . params . length > index ? ( ConvertibleType < t > ) this . params [ index ] : null ; }
Gets the scalar parameter types.