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https://issues.apache.org/jira/browse/OPENJPA-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeremy Bauer updated OPENJPA-1013:
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Issue Type: Sub-task (was: New Feature)
Parent: OPENJPA-1052
> Build strictly-typed Criteria API
> ---------------------------------
>
> Key: OPENJPA-1013
> URL: https://issues.apache.org/jira/browse/OPENJPA-1013
> Project: OpenJPA
> Issue Type: Sub-task
> Reporter: Pinaki Poddar
> Assignee: Pinaki Poddar
> Fix For: 2.0.0-M1
>
> Original Estimate: 1344h
> Remaining Estimate: 1344h
>
> JPA 2.0 has introduced specification for strictly-typed dynamic query
> construction a.k.a Criteria API. The design challenge to support this feature
> comes from the following
> 1. how to leverage existing OpenJPA query infrastructure?
> 2. the type-strictness is supported on the basis of a instantiated meta-model
> -- this is new for OpenJPA query infrastructure. Should we introduce more
> type-strictness in OpenJPA query infrastructure or not?
> The design goals (currently)
> 1. select current design pattern rather than some arbitrary hack to bridge
> existing OpenJPA query infrastructure and JPA 2.0 type-strict Criteria.
> Possibly it is Adapter pattern.
> 2. Do not change OpenJPA query infrastructure with more type-strictness (it
> is not type-free after all). Rather inject type information from the
> artifacts that implement new Criteria API into OpenJPA query artifacts.
> The implementation strategy:
> 1. Prototype the approach first.
> 2. Solidify a design that can be boiler plated (ok, almost) for numerous
> supported query expression and clauses. Then delegate construction of these
> parts.
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