Apache License 2.0

Starting with project version 2.0.0, the project is licensed under the Apache License 2.0. Prior to version 2.0.0, the project was licensed under the MIT License. See License.

Sponsorship

If you want to sponsor the project, you can do so by sharing the project with others - or head over to GitHub Sponsors - @Chrimle!

Getting Started

The mustache templates can be acquired through multiple ways.

Maven Central Repository
GitHub Packages
Downloading them manually from GitHub

Import Dependency

<dependency>
    <groupId>io.github.chrimle</groupId>
    <artifactId>openapi-to-java-records-mustache-templates</artifactId>
    <version>2.1.0</version>
</dependency>

Use the `.mustache` templates when generating

Place the file(s) in desired directory. Then, in the Maven build configuration, set the property <templateDirectory> to the directory path. Example:

<build>
  <plugins>
    <plugin>
      <groupId>org.openapitools</groupId>
      <artifactId>openapi-generator-maven-plugin</artifactId>
      <executions>
        <execution>
          <goals>
            <goal>generate</goal>
          </goals>
          <configuration>
            <inputSpec><!-- Relative directory path to the openapi.yaml file --></inputSpec>
            <templateDirectory><!-- Relative directory path to the mustache templates --></templateDirectory>
            <output><!-- Relative directory path to where generated classes should be placed --></output>
          </configuration>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

Additional Configurations

The generated classes are customizable by using <configuration>-properties.

In this example, each generated class will be named with the suffix “DTO”, and fields of generated records will be annotated with Jakarta Bean Validation annotations.

  <configuration>
    <modelNameSuffix>DTO</modelNameSuffix>
    <!-- ... more configurations ... -->
    <configOptions>
      <useBeanValidation>true</useBeanValidation>
      <!-- ... more configOptions ... -->
    </configOptions>
  </configuration>

See Supported ‘openapi‐generator‐maven‐plugin’ Configuration options

OpenAPI Specification

components:
  schemas:
    Person:
      description: Personal information
      deprecated: true
      type: object
      required:
        - fullName
        - age
        - gender
        - height
        - ssn
        - aliases
        - trackingCode
      properties:
        fullName:
          description: Full name
          type: string
          minLength: 2
          maxLength: 50
        age:
          description: Age (years)
          type: integer
          minimum: 0
          maximum: 100
        gender:
          description: Gender
          type: string
          enum:
            - Male
            - Female
        height:
          description: Height (m)
          type: number
          pattern: float
          minimum: 0
        ssn:
          description: Social Security Number
          type: string
          pattern: '^\d{3}-\d{2}-\d{4}$'
        aliases:
          description: Known Aliases
          type: array
          uniqueItems: true
          minItems: 1
          maxItems: 3
          items:
            type: string
        telephoneNumber:
          description: Telephone Number
          type: string
          nullable: true
        trackingCode:
          description: Tracking code for Web analytics
          type: string
          default: "utm_source=default"

See Supported OpenAPI Specification properties

Generate models

Compile the project, for example via:

mvn compile

Further information about how to generate models can be found on openapi-generator-maven-plugin.

Generated Java Record

Unless the configuration property <output> has been set, the generated classes should be found under ./target/generated-sources/openapi.

package io.github.chrimle.example;

import ...;

/**
 * Personal information
 *
 * @deprecated
 * @param fullName Full name
 * @param age Age (years)
 * @param gender Gender
 * @param height Height (m)
 * @param ssn Social Security Number
 * @param aliases Known Aliases
 * @param telephoneNumber Telephone Number
 * @param trackingCode Tracking code for Web analytics
 */
@Deprecated
public record PersonDTO(
    @javax.annotation.Nonnull @NotNull @Size(min = 2, max = 50) String fullName,
    @javax.annotation.Nonnull @NotNull @Min(0) @Max(100) Integer age,
    @javax.annotation.Nonnull @NotNull GenderEnum gender,
    @javax.annotation.Nonnull @NotNull @DecimalMin("0") BigDecimal height,
    @javax.annotation.Nonnull @NotNull @Pattern(regexp = "^\\d{3}-\\d{2}-\\d{4}$") String ssn,
    @javax.annotation.Nonnull @NotNull @Size(min = 1, max = 3) Set<String> aliases,
    @javax.annotation.Nullable String telephoneNumber,
    @javax.annotation.Nonnull @NotNull String trackingCode) {

  public PersonDTO(
      @javax.annotation.Nonnull final String fullName,
      @javax.annotation.Nonnull final Integer age,
      @javax.annotation.Nonnull final GenderEnum gender,
      @javax.annotation.Nonnull final BigDecimal height,
      @javax.annotation.Nonnull final String ssn,
      @javax.annotation.Nullable final Set<String> aliases,
      @javax.annotation.Nullable final String telephoneNumber,
      @javax.annotation.Nullable final String trackingCode) {
    this.fullName = fullName;
    this.age = age;
    this.gender = gender;
    this.height = height;
    this.ssn = ssn;
    this.aliases = Objects.requireNonNullElse(aliases, new LinkedHashSet<>());
    this.telephoneNumber = telephoneNumber;
    this.trackingCode = Objects.requireNonNullElse(trackingCode, "utm_source=default");
  }

  /**
   * Gender
   */
  public enum GenderEnum {
    MALE("Male"),
    FEMALE("Female");

    private final String value;

    GenderEnum(final String value) {
      this.value = value;
    }

    /**
     * Gets the {@code value} of this enum.
     *
     * @return value of this enum
     */
    public String getValue() {
      return value;
    }

    /**
     * Case-sensitively parses the given string to an enum constant whose {@link #getValue()}
     * matches the provided value.
     *
     * @param value of the Enum
     * @return a {@link GenderEnum } with the matching value
     * @throws IllegalArgumentException if no enum has a value matching the given value
     */
    public static GenderEnum fromValue(final String value) {
      for (final GenderEnum constant : GenderEnum.values()) {
        if (constant.getValue().equals(value)) {
          return constant;
        }
      }
      throw new IllegalArgumentException("Unexpected value '" + value + "'");
    }
  }
}

Further examples

All supported plugin <configuration>-options and OpenAPI Specification-properties have been tested. For reference:

OpenAPI Specification, used for all tests
Maven plugin executions, for each different set of configurations
Generated classes grouped by plugin-execution.

Useful Resources

Encountered an issue?

Double-check that build-configurations and the OpenAPI Specification is supported. If problems persist, check the open issues. If the problem you are facing is not already reported, please open an issue with details and instructions to reproduce.

License

                             Apache License
                       Version 2.0, January 2004
                    http://www.apache.org/licenses/

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