In the case of file translator, Teiid is executing a "procedure" called "getTextFiles", that returns CLOB. So if you want intercept you can intercept that procedure call and return an another CLOB. The view layer in not at translator level, so can not intercept view results. May be you can write a view on top of a view, and in the transformation you can convert the way you want do.
Thank you Ramesh.