java generator, support non-string expandable enum for TypeSpec

[XiaofeiCao]

Previous non-string expandable enum implementation

• Branded
  • Swagger(ExpandableStringEnum, serialization having trouble)
  • TypeSpec(ExpandableStringEnum, serialization having trouble)
• Unbranded
  • ExpandableEnum interface

After this PR

• Branded
  • Swagger(ExpandableEnum interface implementation, with serialization/deserialization supported)
  • TypeSpec(ExpandableEnum interface implementation, with serialization/deserialization supported)
• Unbranded(untouched, supported)

Limitations

• Only supports string and number extensible enums.
• Current TypeSpec doesn't support extensible boolean enum: [Bug]: should getUnionAsEnum handle extensible boolean? Azure/typespec-azure#1162
• Current TypeSpec doesn't seem to have literals other than string, number and boolean(I can't make object literals work): Allow defaults for declarations #2359

About this PR's commits

• TypeSpec code(main purpose): 29841a7
• TypeSpec test case in d37d396
• Swagger test case in autorest.java fix non-string expandable enum serialization, mgmt test case Azure/autorest.java#2953
• Swagger serialization fix: e8454cf
• script change for build: 54af0f1
• A minor mapper bug fix: 41673da

[azure-sdk]

No changes needing a change description found.

[azure-sdk]

You can try these changes here

🛝 Playground	🌐 Website	📚 Next docs

[weidongxu-microsoft]

I am not sure about Swagger non-string expansive enum. I am kind of inclined for them to use ExpandableEnum as well. But I don't know what they really are in service backend.

[XiaofeiCao]

I am not sure about Swagger non-string expansive enum. I am kind of inclined for them to use ExpandableEnum as well. But I don't know what they really are in service backend.

Yes, it depends on backend.
Current monitor and cdn already have such enum. For Swagger, if we decide to serialize them to elementType, guess we could do defaultValueExpression for the string value of the ExpandableStringEnum to convert string back to the elementType.

Let me do a summary and bring this up on thursday's meeting.