Minor refactoring in java files

In this change:
- mark variables and classes final, so they are
  easier to reason about while reading the code
- turn AnalysisUtils into a stateless class, so we
  need not to create a throwaway instance of it
- move ImmutableXXX.copyOf calls from
  AnalysisResult ctor to call sites, to avoid
  making copies if the input is already Immutable
- mark nullable arguments with @Nullable to aid
  readability at call sites
- change a map-based duplication check logic from
  using "if-contains-then-error-else-put" to
  "put-and-fail-if-was-present", because this is
  shorter and Map.put returns the old value anyway
- change a LinkedHashMap to HashMap because the
  latter requires less memory and we never iterate
  over the Map so the linked property is
  unnecessary

PiperOrigin-RevId: 286374383
11 files changed
tree: ea4b5465f3ed12f1eb921e7b74bb94b32d9d44ac
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
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