[rules-users] Literal representation for value objects

[David Boaz]

Hi,
In my application we use few value objects. For example, Dates, Quantities
and Durations. These objects are immutable and have some behavior. For
example, comparing two quantities may involve quantity-conversion
computations (“2 foot” < “3 meter”).

In drools documentation I found an interesting example (section
6.5.2.1.1.3.2. Literal Restrictions, example 6.20):
Cheese( bestBefore < “27-Oct-2007”)
How Does the parser knows to create a Date object from that String? Does
Date has a ‘specialized’ behavior in drools? Is it possible to ‘plugin’
similar behavior for my value classes? How?

I’d like to achieve the following functionality:
Person(height < “2-meter”)

Thanks, David
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