import com.sun.jmx.snmp.EnumRowStatus; //导入依赖的package包/类
/**
 * Return the RowStatus code value specified in this request.
 * <p>
 * The RowStatus code value should be one of the values defined
 * by {@link com.sun.jmx.snmp.EnumRowStatus}. These codes correspond
 * to RowStatus codes as defined in RFC 2579, plus the <i>unspecified</i>
 * value which is SNMP Runtime specific.
 * <p>
 *
 * @param req    The sub-request that must be handled by this node.
 *
 * @param rowOid The <CODE>SnmpOid</CODE> identifying the table
 *               row involved in the operation.
 *
 * @param depth  The depth reached in the OID tree.
 *
 * @return The RowStatus code specified in this request, if any:
 * <ul>
 * <li>If the specified row does not exist and this table do
 *     not use any variable to control creation/deletion of
 *     rows, then default creation mechanism is assumed and
 *     <i>createAndGo</i> is returned</li>
 * <li>Otherwise, if the row exists and this table do not use any
 *     variable to control creation/deletion of rows,
 *     <i>unspecified</i> is returned.</li>
 * <li>Otherwise, if the request does not contain the control variable,
 *     <i>unspecified</i> is returned.</li>
 * <li>Otherwise, mapRowStatus() is called to extract the RowStatus
 *     code from the SnmpVarBind that contains the control variable.</li>
 * </ul>
 *
 * @exception SnmpStatusException if the value of the control variable
 *            could not be mapped to a RowStatus code.
 *
 * @see com.sun.jmx.snmp.EnumRowStatus
 **/
protected int getRowAction(SnmpMibSubRequest req, SnmpOid rowOid,
                           int depth)
    throws SnmpStatusException {
    final boolean     isnew  = req.isNewEntry();
    final SnmpVarBind vb = req.getRowStatusVarBind();
    if (vb == null) {
        if (isnew && ! hasRowStatus())
            return EnumRowStatus.createAndGo;
        else return EnumRowStatus.unspecified;
    }

    try {
        return mapRowStatus(rowOid, vb, req.getUserData());
    } catch( SnmpStatusException x) {
        checkRowStatusFail(req, x.getStatus());
    }
    return EnumRowStatus.unspecified;
}