THIS REPO IS DEPRECATED

The templates in this repo have been accepted upstream into OpenAPI Generator and this repo is no longer needed

Overview

This repository contains a set of mustache templates which are meant to work with OpenAPI Generator. These templates take the existing templates and adds vendor extensions to the OpenAPI spec to support arbitrary annotations on a class, field, getter, and/or setter. For example, in an OpenAPI Specification where you define a Schema type:

    Employee:
      type: object
      x-java-class-annotations:
        - "@javax.persistence.Entity"
        - |-
            @javax.persistence.Table(
              name = "employees",
              uniqueConstraints = {
                @javax.persistence.UniqueConstraint(columnNames = {"email"})
              }
            )
      properties:
        email:
          description: The email address of the employee.
          type: string
          example: hgranger@redhat.com
          x-java-field-annotations:
            - "@javax.persistence.Id"
        name:
          description: Name of the employee.
          type: string
        role:
          description: "The role of the employee. For example, consultant, PM, TSM, etc."
          type: string
          example: Consultant

The x-java-class-annotations and the x-java-field-annotations would be integrated into the model for Employee so that it would be compatible with JPA.

Extra Considerations

In many cases, a type definition which has another type embedded within it is as simple as:

properties:
  skill:
    $ref: '#/components/schemas/Skill'

This approach WILL NOT WORK with this set of extensions. The reason is that OpenAPI delegates complete control to the referenced type and will not parse any additional vendor extensions. You can overcome this as follows:

properties:
  skill:
    type: object
    x-java-field-annotations:
    - "@javax.persistence.ManyToOne(targetEntity = Skill.class)"
    - "@javax.persistence.JoinColumn(name = \"skill_id\", insertable = false, updatable = false)"
    allOf:
      - $ref: '#/components/schemas/Skill'

By defining the type as object and using allOf, you achieve the same result, but OpenAPI will parse and use the vendor extensions

Supported Extensions To OpenAPI

• x-java-class-annotations: Can be used on any Schema Type definition which is not just a reference to another type

  • Employee:
      type: object
      x-java-class-annotations:
        - "@javax.persistence.Entity"
        - |-
            @javax.persistence.Table(
              name = "employees",
              uniqueConstraints = {
                @javax.persistence.UniqueConstraint(columnNames = {"email"})
              }
            )
      properties:

  • x-java-class-annotations: Can be used on any property of a Schema Type which is not just a reference to another type

      properties:
        email:
          description: The email address of the employee.
          type: string
          example: hgranger@redhat.com
          x-java-field-annotations:
            - "@javax.persistence.Id"
        skill:
          type: object
          x-java-field-annotations:
          - "@javax.persistence.ManyToOne(targetEntity = Skill.class)"
          - "@javax.persistence.JoinColumn(name = \"skill_id\", insertable = false, updatable = false)"
          allOf:
            - $ref: '#/components/schemas/Skill'

  • x-java-getter-annotations: Can be used on any property of a Schema Type which is not just a reference to another type
  • x-java-setter-annotations: Can be used on any property of a Schema Type which is not just a reference to another type

Usage

1. Clone this repository into a directory
2. Install OpenAPI Generator
3. Run openapi-generator with some additional parameters like -t /path/to/templates