Can we set filename attribute of Metadata tab dynamically through page filter?

@Override

Hi All,

We are using Oracle WebCenter Sites 11.1.1.8 Patch 13, when creating a new page from contributor I need to set the exported to disk filename dynamically using page filter, I used below code to get the filename but I don't know how to set it 

@Override

    public void filterAsset(IFilterEnvironment env, String identifier,

            FTValList ftValList, IFilterableAssetInstance instance)

                    throws AssetException

    {

            String pageName = instance.getName();

            String fileName = instance.GetFileName(env.getICS());

           

    }

Thanks a lot,