Google Visualization for Enterprise

Its been long time I am using Google Visualizations. Within Google Infrastructure its cool and with Google Spreadsheet it just awesome. Just get the URl put the query and bang with your visuals. Simple as it is. If you are in Appengine, Objectify can help you a lot. With objectify you need no more entity to DTO conversion. But Objectify is solely for Appengine. All these are the ways to do Visualization without implementing a custom Data Source. But when you are doing with enterprise that means you are in your private cloud/ hosting blah balh bla, you need to do some nasty stuffs. May be you need to do Entity to DTO conversion and some more extra effort on the client side or convert your legacy data to required response format for Google visualization that may lead to a custom data source implementation. And in this case you need an Introduction to the Data Source Library. Since you are in enterprise most probably  you are with JAVA. So in fact you need a Data Source in JAVA I found this very much helpful. It eased using Google VIZ in my office.