I want to be able to check if I can edit a cell in a database with a new object

Example method declaration:

something.isValid(Object newObject, row, column);

Example cases:

• If the editing cell stores an Number and I give it a String, the method will return false...
• If the editing cell has to be different than every other entry and the new object is the same as something else, the method will also return false....

My main goal... I want to check a whole row, and if everything is valid, I will edit the whole row.

Right now, the only way I can find out if I can actually edit something is by actually editing it and seeing if I get an error.