public void onEntityUpdate()
    {
        this.worldObj.theProfiler.startSection("entityBaseTick");

        if (this.ridingEntity != null && this.ridingEntity.isDead)
        {
            this.ridingEntity = null;
        }

        this.prevDistanceWalkedModified = this.distanceWalkedModified;
        this.prevPosX = this.posX;
        this.prevPosY = this.posY;
        this.prevPosZ = this.posZ;
        this.prevRotationPitch = this.rotationPitch;
        this.prevRotationYaw = this.rotationYaw;

        if (!this.worldObj.isRemote && this.worldObj instanceof WorldServer)
        {
            this.worldObj.theProfiler.startSection("portal");
            MinecraftServer var1 = ((WorldServer)this.worldObj).func_73046_m();
            int var2 = this.getMaxInPortalTime();

            if (this.inPortal)
            {
                if (var1.getAllowNether())
                {
                    if (this.ridingEntity == null && this.portalCounter++ >= var2)
                    {
                        this.portalCounter = var2;
                        this.timeUntilPortal = this.getPortalCooldown();
                        byte var3;

                        if (this.worldObj.provider.getDimensionId() == -1)
                        {
                            var3 = 0;
                        }
                        else
                        {
                            var3 = -1;
                        }

                        this.travelToDimension(var3);
                    }

                    this.inPortal = false;
                }
            }
            else
            {
                if (this.portalCounter > 0)
                {
                    this.portalCounter -= 4;
                }

                if (this.portalCounter < 0)
                {
                    this.portalCounter = 0;
                }
            }

            if (this.timeUntilPortal > 0)
            {
                --this.timeUntilPortal;
            }

            this.worldObj.theProfiler.endSection();
        }