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From "Pinaki Poddar (JIRA)" <j...@apache.org>
Subject [jira] Updated: (OPENJPA-1013) Build strictly-typed Criteria API
Date Sat, 01 Aug 2009 16:01:15 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pinaki Poddar updated OPENJPA-1013:
-----------------------------------

          Component/s: query
    Affects Version/s: 2.0.0

> Build strictly-typed Criteria API
> ---------------------------------
>
>                 Key: OPENJPA-1013
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1013
>             Project: OpenJPA
>          Issue Type: Sub-task
>          Components: query
>    Affects Versions: 2.0.0
>            Reporter: Pinaki Poddar
>            Assignee: Pinaki Poddar
>             Fix For: 2.0.0
>
>   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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