Binding form data to RecordTemplate

GreetingForm.pdsc

{
  "doc"  : "A form that includes the Greeting resource plus some extra fields",
  "type" : "record",
  "name" : "GreetingForm",
  "include" : [ "Greeting" ],
  "fields" :
  [
    {
      "name"     : "some-extra-field-1",
      "type"     : "string",
    },
    {
      "name"     : "some-extra-field-2",
      "type"     : "string",
    }
  ]
}

RestliForm.java

public class RestliForm<T> extends Form<T extends RecordTemplate> {
  private Class<T> clazz;

  public RestliForm(Class<T> clazz) {
    this.clazz = clazz;
  }

  @Override
  public Form<T> bindFromRequest() {    
    if (Http.Context.current().request().body() != null && Http.Context.current().request().body().asJson() != null) {
        // DataMap dataMap = new JacksonDataCodec().bytesToMap(Http.Context.current().request().body().asJson().toString().getBytes("UTF-8"));

        DataMap dataMap = new DataMap(Http.Context.current().request().body());

        T record = clazz.newInstance();
        record.data().putAll(dataMap);                

        ValidationErrors errors = DataSchemaValidator.validate(record);
        
        return new Form<T>(null, clazz, dataMap, errors, new Some(record));                
    }
    
    return null;
  }
}

RestliFormPlugin.java

public class RestliFormPlugin {
  public static <T extends RecordTemplate> Form<T> form(Class<T> clazz) {
    return new RestliForm(clazz);
  }

  public static <I extends RecordTemplate, O extends RecordTemplate> O toDomainObject(I formObject, Class<O> domainClass) {
    O domainObject = domainClass.newInstance();
    domainObject.data().putAll(formObject.data());
    return domainObject;
  }
}

Usage.java

import static RestliFormPlugin.*;

public class Application extends Controller {
  public static Result index() {
    Form<GreetingsForm> form = form(GreetingsForm.class).bindFromRequest();
    if (form.hasErrors()) {
      // handle errors...
    }
    
    // Convert the form to a domain object and POST it to the greetings rest.li service
    Greeting greeting = toDomainObject(form.get(), Greeting.class);
    RestliClientJava client = Play.application().plugin(RestliPlugin.class).javaClient();
    Promise<Response<Greeting>> promise = client.sendRequest(new GreetingsBuilder().post().input(greeting));

    // etc.
  }
}