find out the algorithm used by this method . concode_field_sep Map<String,Expression> options concode_elem_sep String ALGORITHM concode_elem_sep FilterFactory filterFactory concode_elem_sep ContrastMethod method concode_field_sep FilterFactory getFilterFactory concode_elem_sep void setMethod concode_elem_sep void addOption concode_elem_sep Map<String,Expression> getParameters concode_elem_sep String name concode_elem_sep void setOptions concode_elem_sep Map<String,Expression> getOptions concode_elem_sep ContrastMethod getMethod concode_elem_sep void setAlgorithm concode_elem_sep void addParameter
Expression function ( ) { return options . get ( ALGORITHM ) ; }