nl: returns value of specified field if exists , or null otherwise concode_field_sep Map<String,Object> data concode_elem_sep String ID_KEY concode_elem_sep List<String> fields concode_field_sep boolean isFieldsOrderImportant concode_elem_sep boolean containsField concode_elem_sep void clear concode_elem_sep ObjectId getId concode_elem_sep Object put concode_elem_sep void remove concode_elem_sep boolean equalObjects concode_elem_sep int size concode_elem_sep Object registerField concode_elem_sep int hashCode concode_elem_sep void putAll concode_elem_sep void putAll concode_elem_sep boolean equals concode_elem_sep String toString concode_elem_sep List<String> fields concode_elem_sep BSONObject append
code: Object function ( String arg0 ) { return data . get ( arg0 ) ; }