public StringClauses prepend(String clause) {
        if (StringUtil.trimToNull(clause) == null) {
            return prepend(new Whitespace(clause));
        }
        return prepend(uniqueKey(clause), clause);
    }
public StringClauses prepend(String clause) {
        if (StringUtil.trimToNull(clause) == null) {
            return prepend(new Whitespace(clause));
        }
        return prepend(uniqueKey(clause), clause);
    }
public StringClauses prepend ( String clause ) { if ( StringUtil . trimToNull ( clause ) == null ) { return prepend ( new Whitespace ( clause ) ) ; } return prepend ( uniqueKey ( clause ) , clause ) ; }
Convenience method for {@link #prepend(String, String)} that uses the clause as the key.
Convenience method for {