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https://issues.apache.org/jira/browse/OAK-33?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234342#comment-13234342
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Thomas Mueller commented on OAK-33:
-----------------------------------
Jukka mentioned that OakValue is also a problem because we might want to change
the project name at some point.
Scalar sounds good as well. First I thought it's not a good match but after
reading the Wikipedia article I like it.
> a single internal value representation which also works for the jcr bindings
This sounds interesting: it would avoid converting values (copying data). Also,
we would only need one "value cache". It would save memory and speed up things.
Unfortunately, it couldn't be an interface then ("ValueImpl extends Scalar"
wouldn't work if Scalar is only an interface).
Another question is multi-value properties. I kind of don't like using Scalar[]
and ValueImpl[] everywhere just because a property *could* be a multi-value
property. I'm not sure how to be solve this. JsonValue has isArray(), which
sounds interesting.
> Values in oak-core
> ------------------
>
> Key: OAK-33
> URL: https://issues.apache.org/jira/browse/OAK-33
> Project: Jackrabbit Oak
> Issue Type: New Feature
> Components: core
> Reporter: Thomas Mueller
>
> There is no JCR API in oak-core, but we still need to deal with values and
> data types. We have multiple options, I can think of:
> (A) String everywhere, as in oak-mk
> (B) Use javax.jcr.Value
> (C) An immutable "Value" class (but doesn't need to be called "Value")
> There are multiple problems with (A), for example compile time safety, and I
> fear the code would get unnecessarily complex, not as efficient as it could
> get (specially when dealing with numbers), memory usage would be higher.
> I think we said (B) isn't an option because we don't want to use the JCR API
> in oak-core (see also OAK-16).
> As for (C), I have a first prototype, mainly because I needed it to be able
> to migrate the query feature to oak-core. The prototype is in
> org.apache.jackrabbit.oak.query.ValueFactory
> org.apache.jackrabbit.oak.query.Value
> org.apache.jackrabbit.oak.query.PropertyType
> It's very similar to javax.jcr (even the property types are the same), but
> the values are immutable. They currently implement Comparable<Value>, but
> that's also open for discussion. One sub-problem is binaries: should they
> contain a reference to the MicroKernel instance, or some other "storage
> backend" (possibly a temp file backend)?
> Concrete suggestions (and patches) are welcome.
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