Re: Dependeny on javax.swing

Monday, December 28, 2009, 12:07:31 PM, Guo Du wrote:

> 2009/12/28 Daniel Dekany <[email protected]>:
>>> javax.swing.tree.*, that'd be a start. As I said, something similar
[snip]
>> So can that be worked around in FreeMarker (and of so, with how much
>
> I have two concern for work around javax.swing.tree.* package reference.

Note that above I referred to the reflection issue.

> 1. Backword compatibility, we don't want break the stable release
> stream in 2.3.X. Even NORMAL freemarker usecase won't be involved with
> the swing.

Since Java language is quite static (which I like in general but these
are the situations where it clearly backfires), the only
backward-compatible work-around I can imagine is to create a separate
release for each FreeMarker version that specifically targets GWE. But
that's not that easy for the *users* as it may sound, as components
that were not written specifically for GWE may pull in "plain"
FreeMarker via automated dependency management (Maven, OSGi, etc.). I
know, at least ideally that can be overridden, but I guess the way we
upset the least number of users is by breaking the backward compatibly
promise in this case, and blame Google.

> 2. The simple/safe way to get away from javax.swing.tree.* is to
> duplicate the used classes/interface insides freemarker such as
> freemarker.core.tree. It may have copyright concern to the source
> code.

I didn't look into this, but most certainly we will have to re-write
these from scratch, only by looking at the javax.swing Java docs.

> P.S. There are only 4 direct reference in freemarker 2.3.15, so not a
> big deal to just copy them to freemarker :)
> ./freemarker/template/Template.java:57:      import javax.swing.tree.TreePath;
> ./freemarker/core/FreeMarkerTree.java:56:   import javax.swing.JTree;
> ./freemarker/core/FreeMarkerTree.java:57:   import
> javax.swing.tree.DefaultTreeModel;
> ./freemarker/core/TemplateElement.java:57: import javax.swing.tree.TreeNode;
>
> -Guo
>
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-- 
Best regards,
 Daniel Dekany


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