How to implement custom Model Class in Oracle ADF?

I am using Oracle ADF for one of my project and i am using Query component of ADF. For given tables the query component creates view objects and maps the relations. ADF uses its own custom model class for this component and it should understand the DB tables. But for my project i have no access to database. All i can do is pass a string or object/query to the existing (custom) Java class/object, and this model class formulates query and queries the database and returns the value to my Java class. I have to display these results using ADF to the front end. Is There a way to achieve this? Can i replace/override the existing Model class of ADF. If so how?
Thanks in advance for your help.

Hi, there:
Best thing to do is to start with the default login.html page, and then modify it. The login screen is fairly complex and it's easy to just miss a JS function you need to call. To get to default page, you would need to do one deploy (to simulator or whatever), and then look for login.html page in the temporary Xcode or Android project generated from the deployment. It should be under the "deploy" directory in your JDev workspace.
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We have had customers implementing custom login screen so we know it can work, but they all had to start with the default login screen and then modify it.
Thanks,
Joe Huang

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