Now, we will add a Collection
validator to DeptEO.xml
for adding a count validation rule. Imagine a business rule that says that the number of employees added to department number 10
should be more than five. In this case, you will have a count
operation for the employees added to department number 10
and show a message if the count is less than 5
for a particular department.
We will break this action into the following three parts:
Adding a declarative validation: In this case, the number of employees added to the department should be greater than five
Specifying the execution rule: In our case, the execution of this validation should be fired only for department number
10
Displaying the error message: We have to show an error message to the user stating that the number of employees added to the department is less than five