Error generating model using array of enum with type format int32 or int64

Description

When a definition contains an array of enums, and the items format value is int32, the generated java model is invalid.

Swagger-codegen version

version 2.x

Swagger declaration file content or url

swagger: '2.0'
info:
  description: 'My Service'
  version: 1.0.0
  title: My Service
schemes:
  - http
paths:
  /templates:
    get:
      summary: Returns all
      description: ''
      operationId: getAll
      produces:
        - application/json
      responses:
        '200':
          description: successful operation
          schema:
            type: array
            items:
              $ref: '#/definitions/Parent'
definitions:
  Parent:
    discriminator: id
    properties:
      id:
        type: string
      status:
        type: array
        items:
          type: integer
          format: int32
          enum:
            - 1
            - 2
            - 3
    required:
      - id
  Child:
    allOf:
      - $ref: "#/definitions/Parent"
      - type: object
        properties:
          subProperty:
            type: string

Command line used for generation

java -jar swagger-codegen-cli-2.3.0.jar generate -i codegen-test.yaml -l java -o codegen-test

Steps to reproduce

Run code generation,

The generated Parent class:

public class Parent {
// ....
public enum StatusEnum {
    _1("1"),
    _2("2"),
    _3("3");
    private Integer value;

    StatusEnum(Integer value) {
      this.value = value;
    }

    public Integer getValue() {
      return value;
    }

    @Override
    public String toString() {
      return String.valueOf(value);
    }

    public static StatusEnum fromValue(String text) {
      for (StatusEnum b : StatusEnum.values()) {
        if (String.valueOf(b.value).equals(text)) {
          return b;
        }
      }
      return null;
    }
 // ....
}
//...
}

Related issues/PRs

#3147

Suggest a fix/enhancement

The constructor is expecting Integer.
change to number_1(1);

Start by running the provided swagger-codegen-cli 2.3.0 command with the YAML declaration and inspect the generated Parent Java model, especially StatusEnum. Trace the Java model-generation entry point or template responsible for array enum values with int32/int64 formats. Done means the generated model is valid Java and its enum values preserve the numeric values shown in the declaration.