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From "Dion Gillard" <d...@trongus.com>
Subject Re: [PROPOSAL] Commons Expression
Date Tue, 15 Apr 2008 14:14:20 GMT
So this is similar to a backport of javax.script to 1.4?

On Tue, Apr 15, 2008 at 7:13 AM, Rahul Akolkar <rahul.akolkar@gmail.com>
wrote:

> [I] Rationale:
>
> Numerous expression languages exist for embedding in Java-based
> applications and frameworks. There is a growing tend to defer choice
> of the expression language, especially since users of frameworks and
> middleware components demand such freedom. Commons Expression aims to
> provide a simple abstraction over these expression languages.
>
> No such library exists in Apache Commons or anywhere else under AL, AFAIK.
>
> [II] Scope:
>
> The package shall create and maintain a simple abstraction API over
> expression languages. It will also provide the necessary adapters to
> bridge the API with several existing expression language
> implementations. The exact list is TBD, it may grow over time pending
> community interest. Examples are (references provided for a couple):
>
>  * Commons EL [1]
>  * Commons JEXL [2]
>  * JavaScript
>  * Pnuts
>  * MVEL
>  * OGNL
>  * JUEL
>  * javax.script related
>
> The package shall not implement an expression language of its own.
>
> [III] Dependencies:
>
> The Commons Expression codebase shall not have any compile-time
> dependencies, other than each of the expression language
> implementations for the above-mentioned adapters. The run-time
> dependencies will be a function of developer choice.
>
> The minimum JDK version shall be 1.4, atleast one JDK 1.4-compatible
> release is anticipated. A JDK 1.5 branch can be started concurrently
> while in sandbox, pending interest.
>
> [IV] Code Provenance:
>
> The library will be seeded with code from Commons SCXML [3].
> Specifically, the Context and Evaluator interfaces along with existing
> implementations for Commons EL and Commons JEXL along with
> corresponding tests will be pulled in. Further additions will be
> driven by community interest.
>
> [V] Naming, Resources and Conventions:
>
> The base name for the proposed package will be:
>
> org.apache.commons.expression
>
> The project will use the Apache Commons user and dev mailing lists,
> will create a component repository named "expression" (lower case) in
> SVN under commons-sandbox and will be listed as "Expression" in the
> project list in JIRA (as "Expression" component under "SANDBOX" before
> graduation). Code style conventions will be borrowed from the parent
> component (Commons SCXML).
>
> [VI] Committer Interest:
>
> The following Apache committer has expressed interest in the creation
> of this Commons Sandbox component:
>
>  * Rahul Akolkar
>
> [VII] Reference Links:
>
> [1] Commons EL http://commons.apache.org/el/
> [2] Commons JEXL http://commons.apache.org/jexl/
> [3] Commons SCXML http://commons.apache.org/scxml/
>
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>


-- 
dIon Gillard
"Any sufficiently advanced technology is indistinguishable from magic" -
Arthur C. Clarke 1917 - 2008

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