h2. Oid

The *Oid* class represents the *IETF* ObjectIDentifier. It's a numerics/dots representation of a unique element in a hierarchy of objects. It's used in a few places in the *API*, like when one wants to send an _Extended operation_ (extended operations are identified by their *OID*).

You are not likely to use and *Oid* or create an *Oid* instance, usually you will use a String containing an *OID*.

However, this class contains an utility methods that can be useful when manipulating *OID* as Strings. It tells you if the String is a valid *OID* :



{code}
     public static boolean isOid( String oid )
{code}

It's easy to use :


{code}
        if ( Oid.isOid( Ç 1.2.3.4.5 È ) ) {
            ...
{code}

Note that *Oids* have to respect a few rules :

* each number must be separated by a dot
* only dots and numbers are allowed
* an *Oid* must start and end with a number
* the first number must be 0, 1 or 2
* the second number must be within \[0, 39\]
* a number must always be greater or equal to 0