Add a query for the points track passes through

[Drefvelin]

Summary

Adds TrackRegistry.sampleTrack(String world, double spacing), which returns points along every track spline in a world. SimpleFactions will use it to tell which provinces a railway crosses.

• Each spline is walked by arc length at the given spacing; a spacing of zero or less means 4 blocks.
• Open track always includes its end point. A loop does not repeat its start.
• Branches are their own splines, so they are included.
• A null or blank world returns an empty list.

No change to laying, saving, or route length.

Testing

Eight new tests in TrackRegistrySampleTest. The existing VehicleRepositoryTest.vacuumIntoKeepsThreeNewest fails intermittently on main as well and is being fixed separately.

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Reviewing files that changed from the base of the PR and between 7208c64 and ba43318.

📒 Files selected for processing (2)

• src/main/java/net/tfminecraft/vehicleframework/tracks/TrackRegistry.java
• src/test/java/net/tfminecraft/vehicleframework/tracks/TrackRegistrySampleTest.java

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📝 Summary

Summary by CodeRabbit

• New Features
  • Added track sampling that returns positions along splines in a selected world at regular intervals, measured by track length. Sampling covers all splines in the world, includes the endpoint on open tracks and avoids duplicating the endpoint on loops.
  • Null, blank or missing world names return no positions. Invalid or non-positive spacing defaults to four blocks; valid spacing below 0.5 blocks is raised to 0.5 blocks.

Walkthrough

Adds TrackRegistry.sampleTrack(String world, double spacing) to return sampled spline positions for a world. Adds the TrackSamplePoint record, which carries a spline UUID and coordinates. Tests cover world filtering, spacing, endpoints, arc-length traversal and loops.

Changes

Track sampling

Layer / File(s)	Summary
Sampling API and behaviour src/main/java/net/tfminecraft/vehicleframework/tracks/TrackSamplePoint.java, src/main/java/net/tfminecraft/vehicleframework/tracks/TrackRegistry.java, src/test/java/net/tfminecraft/vehicleframework/tracks/TrackRegistrySampleTest.java	Adds the TrackSamplePoint record and TrackRegistry.sampleTrack. The method returns no samples for null or blank worlds. Invalid or non-positive spacing defaults to four blocks. Valid spacing is clamped to a minimum of 0.5 blocks. Sampling uses arc-length intervals. Open tracks include the endpoint; loops do not. Tests cover world filtering, spacing, endpoints, arc-length traversal and loops.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Suggested reviewers: ryanbarlow97

Merge Risk: ⚪ Minimal · up to ba433

This adds a read-only track sampling query without changing existing track behavior. No outstanding merge-blocking issues were found in the supplied review.

Security Architecture Review

Security architecture risk: 🔵 Low · up to ba433

The API returns track coordinates through an existing plugin-access boundary without changing track persistence or train control. No introduced security issue was established, but external callers, their authorization, and production workload are not verified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• observed — A call returns sampled coordinates and identities for every spline matching the selected world, not just an individual track or province. Callers can select other registered worlds through repeated calls, although world-scoped spline access already existed.

Trust Boundaries and Controls

• inferred — The demonstrated access boundary remains an in-process caller holding the public registry API. Sampling simplifies access to information already obtainable through public spline reads; the inspected implementation does not establish a new player-facing or cross-service authorization boundary.

Resilience and Maintainability Implications

• inferred — The half-block minimum prevents arbitrarily dense sampling caused solely by tiny spacing values. However, eager result allocation still grows with total matching track length, and there is no total sample budget. Whether this affects server failure containment depends on external caller frequency and production track size, which are unverified.

Hardening Proposals

• proposed — If a downstream integration exposes sampling to untrusted requests, define its world-access policy and bound request frequency or aggregate sample work before relying on this API. This is conditional integration hardening, not an observed vulnerability.

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Actionable comments posted: 1

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Inline comments:
Review comments at
@src/main/java/net/tfminecraft/vehicleframework/tracks/TrackRegistry.java:
- Line 1042: Update the sampling loop in TrackRegistry to compute each distance
from an integer index multiplied by spacing, avoiding cumulative floating-point
drift. Also enforce a minimum spacing or maximum sample count so tiny
caller-provided spacing cannot generate an unbounded number of points; keep the
explicit endpoint handling intact.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 5a16074c-9bc1-4f24-b657-e563a468f85f

📥 Commits

Reviewing files that changed from the base of the PR and between cb70aae and 7208c64.

📒 Files selected for processing (3)

• src/main/java/net/tfminecraft/vehicleframework/tracks/TrackRegistry.java
• src/main/java/net/tfminecraft/vehicleframework/tracks/TrackSamplePoint.java
• src/test/java/net/tfminecraft/vehicleframework/tracks/TrackRegistrySampleTest.java

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