/**
         * Create a Binding given an IdentityAssoc loaded from the database.
         *
         * @param ia the ia
         * @param clientLink the client link
         * @param requestMsg the request msg
         *
         * @return the binding
         */
        protected override Binding BuildBindingFromIa(IdentityAssoc ia,
                                                      DhcpLink clientLink, DhcpMessage requestMsg)
        {
            Binding          binding = new Binding(ia, clientLink);
            List <IaAddress> iaPrefs = ia.GetIaAddresses();

            if ((iaPrefs != null) && iaPrefs.Count > 0)
            {
                List <IaAddress> bindingPrefixes = new List <IaAddress>();
                foreach (IaAddress iaAddr in iaPrefs)
                {
                    // off-link check needed only for v4?
                    //				if (!clientLink.getSubnet().contains(iaAddr.getIpAddress())) {
                    //					log.info("Ignoring off-link binding address: " +
                    //							iaAddr.getIpAddress().getHostAddress());
                    //					continue;
                    //				}
                    V6BindingPrefix bindingPrefix = null;
                    StaticBinding   staticBinding = FindStaticBinding(clientLink.GetLink(), ia.GetDuid(), ia.GetIatype(), ia.GetIaid(), requestMsg);
                    if (staticBinding != null)
                    {
                        bindingPrefix =
                            BuildV6BindingPrefixFromIaPrefix((IaPrefix)iaAddr, staticBinding);
                    }
                    else
                    {
                        bindingPrefix =
                            BuildBindingAddrFromIaPrefix((IaPrefix)iaAddr, clientLink.GetLink(), requestMsg);
                    }
                    if (bindingPrefix != null)
                    {
                        bindingPrefixes.Add(bindingPrefix);
                    }
                }
                // replace the collection of IaPrefixes with BindingPrefixes
                binding.SetIaAddresses(bindingPrefixes);
            }
            else
            {
                log.Warn("IA has no prefixes, binding is empty.");
            }
            return(binding);
        }