RFR: 8360037: Refactor ImageReader in preparation for Valhalla support [v13]

[David Beaumont]

On Fri, 25 Jul 2025 17:09:30 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> This class is *almost* only here for building JrtFileSystem. Everything else is marginal usage. Hence, admitting that in these docs felt reasonable to me. I think it would be bad if someone reading the docs in this class didn't know that there's a strong reason for the namespace unification. I can reframe it to talk-around the fact this is all ultimately for file-system like semantics without naming JrtFileSystem, but they are extremely closely coupled in terms of usage.
>
> It should be possible to move jrtfs to its own module, say jdk.jrtfs. It does not need to be in the base module. My comments are only to ensure that we keep the architectural boundaries clean.

Also, the line:

"is used internally in the JDK to implement jimage/jrtfs access"

is just below so it's not the first admission that this is aligned closely with JrtFileSystem.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26054#discussion_r2231652596