Filters to LocalFolderArtifact

Hi,

 I want to add folders as artifacts from harddisk to RAM using RAM API. I'm using LocalFolderArtifact

                File folder = new File("D;\\mydocs\\lib");
                LocalFolderArtifact folderArtifact = new LocalFolderArtifact(folder);
                root.addArtifact(folderArtifact);

But i want to exclude some of files in folders, i cannot add all files inside folder. for example to exclude file with name sample.txt and file of type xls like that.how can i achieve that? Is there any way to add filters for LocalFolderArtifact. Help me please.