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feat: Java 21 modernization — terrain - #14

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feat: Java 21 modernization — terrain#14
devin-ai-integration[bot] wants to merge 3 commits into
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devin/java21-terrain

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@devin-ai-integration devin-ai-integration Bot commented May 26, 2026 •
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Note: Filling out this template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the
maintainer's discretion.

Description of the Change

Modernizes clear-cut Java 21 pattern-matching opportunities in src/gov/nasa/worldwind/terrain/ only:

  • Converted 11 instanceof-then-cast sites to Java 21 pattern matching.
  • Updated 6 files: CompoundElevationModel.java, LocalElevationModel.java, RectangularTessellator.java, SectorGeometryList.java, WCSElevationModel.java, and WMSBasicElevationModel.java.
  • Introduced 0 records, 0 sealed hierarchies, 0 text blocks, and 0 deprecated API removals.
  • Made no public/protected API signature changes and no test changes.

Verification:

  • Before counts: new Runnable(): 3, new ActionListener(): 0, new Callable(): 0, new MouseListener(): 0, new KeyListener(): 0, new ChangeListener(): 0, new PropertyChangeListener(): 1, new WindowListener(): 0, instanceof: 19.
  • After counts: same aggregate instanceof count, with 11 local cast-after-check sites converted to pattern variables.
  • git diff origin/devin/java21-foundation -- src/gov/nasa/worldwind/terrain | grep -E "^\+.*public |^\+.*protected " returned no public/protected API additions.
  • ant -f release-build.xml under JDK 21: BUILD SUCCESSFUL; JUnit: 435 tests, 0 failures, 0 errors, 7 skipped.

Flagged for human review:

  • Remaining new Runnable() and new PropertyChangeListener() anonymous classes are retained due to threading/listener semantics and/or anonymous class shape.
  • Remaining instanceof checks are retained when they are pure boolean guards, negative guards, or readability-neutral cases without nearby casts.

Devin session: https://app.devin.ai/sessions/36287b7c637242dba0a6a659737d5402
Devin Review verdict: ready for review; no API/test-surface changes detected locally.

Why Should This Be In Core?

This is one atomic package step in the Java 11 to Java 21 LTS migration. It keeps terrain/elevation behavior stable while reducing legacy cast boilerplate.

Benefits

  • Uses Java 21 pattern variables for clearer local type narrowing.
  • Preserves existing behavior and package boundaries.
  • Keeps the migration reviewable as a package-scoped PR.

Potential Drawbacks

  • This PR depends on the foundation JDK 21 build-retargeting work for compilation under Java 21.
  • Listener/threading anonymous classes remain intentionally unchanged for compatibility.

Applicable Issues

N/A

Requested by: @jakexcosme

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@devin-ai-integration

devin-ai-integration Bot commented May 26, 2026

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Original prompt from Jake

#``# Overview

Migrate COG-GTM/WorldWindJava from Java 11 to Java 21 LTS. This is a federal-grade, zero-breakage migration with atomic per-package PRs, full test verification before and after, and a rollup audit document. Use parallel child sessions to accelerate. All PRs target the fork's develop branch.

#``# PHASE 0: Pre-Migration Baseline (Sequential — MUST complete before anything else)

#``#``# Step 0.1: Capture Pre-Migration Baseline Metrics
Before ANY changes, on the develop branch with JDK 11:

`#` File count
find src -name "*.java" | wc -l
`#` Anonymous inner class counts
grep -rn "new Runnable()" --include="*.java" src/ | wc -l
grep -rn "new ActionListener()" --include="*.java" src/ | wc -l
grep -rn "new Callable()" --include="*.java" src/ | wc -l
grep -rn "new MouseListener()" --include="*.java" src/ | wc -l
grep -rn "new KeyListener()" --include="*.java" src/ | wc -l  
grep -rn "new ChangeListener()" --include="*.java" src/ | wc -l
grep -rn "new PropertyChangeListener()" --include="*.java" src/ | wc -l
grep -rn "new WindowListener()" --include="*.java" src/ | wc -l
`#` instanceof pattern-match candidates
grep -rn "instanceof " --include="*.java" src/ | wc -l
`#` Deprecated usage
grep -rn "`@`Deprecated" --include="*.java" src/ | wc -l
grep -rn "new Integer(" --include="*.java" src/ | wc -l
grep -rn "new Double(" --include="*.java" src/ | wc -l
grep -rn "new Float(" --include="*.java" src/ | wc -l
grep -rn "new Long(" --include="*.java" src/ | wc -l
grep -rn "new Boolean(" --include="*.java" src/ | wc -l

Save all counts to a file BASELINE-METRICS.txt at the repo root. This is your "before" snapshot.

#``#``# Step 0.2: Run the existing test suite under JDK 11

ant -f release-build.xml

Record pass/fail counts. This establishes that the test suite is green BEFORE migration.

#``# PHASE 1: Foundational JDK 21 Retarget PR (Sequential — Wave 0)

#``#``# Step 1.1: Create branch devin/java21-foundation
Make these changes ONLY (no code changes):

  1. **`release-... (12653 chars truncated...)

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devin-ai-integration Bot commented May 26, 2026

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