MVC使用swing，如何让模型要求用户输入？

Question

I have an MVC application where the starts a Thread and therein starts a progressbar inside the the action originated and calls the to go over a list of data selected in a and process it in some way.

Now while the Model is going over the data it encounters one or more entries that he wants the user to confirm for some reason. How should this be handled using MVC?
Note that the Controller can handle multiple views, which of them should be responsible for the user input, how to differentiate between them, ... ?

Answer 1

Validating input should be handled at the earliest opportunity possible in the view. The view can query the model to verify an entry in context. As a concrete example , this InputVerifier overrides verify() to ensure numeric entry, but it might also ask the model do additional checks, perhaps comparing against other model attributes. For example,

@Override
public boolean verify(JComponent input) {
    try {
        value = Double.parseDouble(field.getText());
        return model.isValid(value); // also check model
    } catch (NumberFormatException e) {
        return false;
    }
}