Best way to validate multiple entity objects with each other

I have the following scenario.
There is one entity object with the following fields.
Name
Start Date
End Date
My requirement is to validate the dates in the entity do not overlap.
What is the best way to achieve the same.
This validation should be fired when we commit, since the user should be allowed to change the dates freely between entities.(Validation should not kick off when the current row changes)
Thanks

For this to achieve there is a concept called Effective Dated Entity Objects in Oracle ADF.
Official ADF Documentation: http://docs.oracle.com/cd/E37975_01/web.111240/e16182/bcentities.htm#ADFFD20110
Some blogs to help you
http://one-size-doesnt-fit-all.blogspot.co.uk/2008/11/jdev11g-new-feature-effective-dated.html
http://adfblogs.blogspot.co.uk/2011/09/understanding-effective-dated-entities.html
Regards,
Peddi.

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