CODEWITHSUNDEEP
javaclassoop
froxas
froxas

Reputation: 1

How to design Java Contract class for an Employee

I am designing a class for an employee management system.
Class Employee has following fields:

:Employee  
id:int  
firstName:String  
lastName:String  
contract:Contract

Class Contract has following fields:

:Contract  
-contractNo:int  
-contractDate:Date  
-contractType:Type  
-rate:Double  
-function:Function  
-contractCopy:File

When an individual becomes employed within the company, he/she signs a contract with an agreed rate, function etc. From time to time, management revises the contract and changes rate and/or function.

Could somebody advise how to design a class that stores revisions of the contract? The user needs to view the original information and all revisions.

Upvotes: 0

Views: 476

Answers (2)

Sebastian Malaca
Sebastian Malaca

Reputation: 111

You can use Event Sourcing Pattern. It will allow you to track the change history.

In short you create an event for each change and thanks to this you may review it whenever you want.

You can find more information here:

Upvotes: 0

pczeus
pczeus

Reputation: 7867

You already have two nice entities to create classes for: Contract and Employee, both of which also make nice tables to store data.

I would create a ContactRevision class, that has fields of the Contract that can be revised.

For example:

:ContactRevision
  -contractType
  -rate
  -modifiedOn
  -modifiedBy

You could then add a property to your Contract entity called revisions of type List<ContractRevisions>, with operations like addRevision or getAllRevisions to show the changed values if desired.

Upvotes: 2

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