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https://issues.apache.org/jira/browse/ISIS-1695?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andi Huber closed ISIS-1695.
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Fix Version/s: 2.0.0-RC1
Assignee: Andi Huber
Resolution: Implemented
We have improved value semantics support now.
See eg. UUIDValueSemantics, which demonstrates the concept.
> Support value types (simple ones at least) as a first-class citizen
> -------------------------------------------------------------------
>
> Key: ISIS-1695
> URL: https://issues.apache.org/jira/browse/ISIS-1695
> Project: Isis
> Issue Type: New Feature
> Components: Isis Incubator
> Reporter: Daniel Keir Haywood
> Assignee: Andi Huber
> Priority: Minor
> Fix For: 2.0.0-RC1
>
>
> I would like to reintroduce value types as a first-class citizen, but without
> requiring the developer to have to write lots of code to teach DataNucleus,
> Wicket and the RO viewer about these.
> I don't have a general solution in mind on how to do this.
> However, for very simple value types that are just a type-safe wrapper around
> a single field (eg Password, or Money, or Temperature, or Email say), then
> perhaps there might be a way to support this, eg :
> public class Temperature implements
> org.apache.isis.valuetypes.Value<BigDecimal> {
> public Temperature(BigDecimal value) \{ ... }
> BigDecimal getValue() \{ ... }
> }
>
> or
>
> @Value(underlying=BigDecimal.class)
> public class Temperature \{ ... }
> The idea here is that the framework would treat any instance of this custom
> value type as if it were the underlying type (BigDecimal in the case above).
> It would also be possible to apply validations to the value type that would
> apply everywhere it is used as a property/parameter.
>
> We would expect these value types to be immutable, and (although this can't
> be expressed in an interface), would expect there to be a public 1-arg
> constructor of the appropriate type, and a package-local "getValue()" method.
> These allow the framework to marshal values in and out of the value type.
>
>
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