Add EnumMapCodec. Some hackery necessary to get Class for Enum when map is empty.

Since EnumMap.equals() ignores the key type when the maps are empty [1], we could just return a canonical empty EnumMap, but that seems to depend on implementation details in a hacky and potentially subtly broken way. The Unsafe method will hopefully break spectacularly if it goes wrong.

[1] http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/util/EnumMap.java#l685

PiperOrigin-RevId: 189803280
3 files changed
tree: 278a86260ddd10458bde0607980149b7627489f2
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.py
  13. combine_distfiles_to_tar.sh
  14. compile.sh
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. ISSUE_TEMPLATE.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
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