[cpprestsdk] Implement Enum inside Objects

[SaverioCode]

[#8937 #958(actually already closed)]
I added the support for enum type inside objects. They can be stand alone or inside vectors. Set of enums doesn't compile in favor of vectors(if necessary can be supported, if you think that set of enums are useful). Map with enums will be as before.

Other then the yaml/json from the issues I used:

{
  "openapi": "3.0.0",
  "info": {
    "title": "Enum Class Example",
    "version": "1.0.0"
  },
  "components": {
    "schemas": {
      "MyClass": {
        "type": "object",
        "properties": {
          "status": {
            	"type": "string",
		"enum": ["ACTIVE", "INACTIVE", "PENDING"]
          },
	  "test1": {
	  	"type": "array",
		"items": {
			"type": "string",
			"enum": ["available", "pending"],
			"default": "available"
		}	
	  },
	  "test2": {
		"type": "string"
	   },
	   "myMap2": {
	   	"type": "object",
		"propertyNames": {
			"type": "integer"
		},
		"additionalProperties": {
			"type": "string",
			"enum": ["PRIMO", "SECONDO", "TERZO"]
		}
	   },
	   "myMap3": {
		"type": "object",
		"propertyNames": {
			"type": "string"
		},
		"additionalProperties": {
			"type": "array",
			"items": {
				"type": "string",
				"enum": ["ARR_1", "ARR_2", "ARR_3"]
			}
		}
	   },
	   "myMap4": {
		"type": "object",
		"propertyNames": {
			"type": "string",
			"enum": ["MAP3_1", "MAP3_2", "MAP3_3"]
		},
		"additionalProperties": {
			"type": "string"
		}
	   },
	  "numVar": {
		"type": "integer",
		"format": "int32"
	  }
        }
      }
    }
  }
}

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@ravinikam @stkrwork @etherealjoy @MartinDelille @muttleyxd

[wing328]

can you please add a test or 2 in modules/openapi-generator/src/test/resources/3_0/cpp-restsdk/petstore.yaml to test the change?

[wing328]

let's give it a try. i will file a PR later to improve the code format a bit.

thanks for the PR

[SaverioCode]

@wing328

Sorry but I have been very busy these weeks.

Thanks for taking care of code enhancement!

1. For the test should I open another PR?
2. I also wanted to propose a little improvement for debug purpose. To enclose in a try and catch block the single attributes converted from the json to the appropriate class, with fromJson. This because several times can happen that an error is raised but the message is generic and doesn't refer to any particular field. This of course make debugging complex.

[wing328]

For the test should I open another PR?

yes please

I also wanted to propose a little improvement for debug purpose

yes please open a separate PR for easier review

thanks again for your contributions