I have a design doubt... I must validate data coming from a form. This consist typically of:
- 'format' validations (i.e. a field is not empty or it is numeric) that I do in the validate method of the ActionForm
- 'business' validations that usually require a DB access
I actually do 2 steps (actions) per operation. One of them prepare the data and the second one does the operation itself. And here comes my first question: ��is there any other better aproach?? Maybe something similar to a Tiles Controller to prepare the data...
class PreOperationAction extends Action {
public ... execute ( ... ) {
// Create JavaBeans to populate html selects and several inputs (requires DB access) and include them in the request
// Forward to error/success jsp
}
}
class PostOperationAction extends Action {
public ... execute ( ... ) {
// Get data from ActionForm
// Business validations (the selected values and inputs are valid from the business point of view)
// Execute business logic (encapsulated in external business logic classes)
// Forward to error/success jsp
}
}
At this point I don't know what is better (from a MVC perspective).
1. Do it as actually, that is, doing business validation before business logic. This way I think I can't expose the business logic as an API or as a web service.
2. Include all the validations (business and format) into the business logic classes. This way I must duplicate format validations
3. Doing a OperationValidations class (? only a vague idea)
4. Is there any pattern or any best practice related? Does Validator Plugin allow complex business validations?
Finally, I need your opinion about handling validation errors:
1. Throwing an Exception from the business logic classes and catch it in the Action (or declare the exception in struts-config.xml)
2. Returning null (or -1, or a no-sense value) from the business logic classes
3. Any other way...
Thank you very much, Guido Garc�a Bernardo.
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