[forge-issues] [JBoss JIRA] (FORGE-1617) Command constraint-new-field to add a new field to an existing constraint

[Antonio Goncalves (JIRA)]

Antonio Goncalves created FORGE-1617:
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             Summary: Command constraint-new-field to add a new field to an existing constraint
                 Key: FORGE-1617
                 URL: https://issues.jboss.org/browse/FORGE-1617
             Project: Forge
          Issue Type: Sub-task
          Components: Scaffold
    Affects Versions: 2.1.1.Final
            Reporter: Antonio Goncalves
             Fix For: 2.x Future


Some constraints need to have fields (attributes). For example, the {{URL}} constraint needs three fields : a protocol, a host, and a port :

{code}
constraint-new-field --named protocol --type String --targetConstraint URL
constraint-new-field --named host --type String --targetConstraint URL
constraint-new-field --named port --type String --targetConstraint URL
{code}

This will add the three attributes to the existing constraint {{URL}} : 

{code}
@Documented
@Constraint(validatedBy = URLValidator.class)
@Target( { METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
@ReportAsSingleViolation
public @interface URL {
	String message() default "{org.mycompany.myproject.constraints.URL.message}";

	Class<?>[] groups() default { };

	Class<? extends Payload>[] payload() default { };

	String protocol() default "";

	String host() default "";

	int port() default -1;

	@Target( { METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
	@Retention(RUNTIME)
	@Documented
	public @interface List {
		URL[] value();
	}
}
{code}

But it will also add the three attributes to the implementation : attributes and {{initialize}} method : 

{code}
public class URLValidator implements ConstraintValidator<URL, String> {

  private String protocol;
  private String host;
  private int port;

  @Override
  public void initialize(URL url) {
    this.protocol = url.protocol();
    this.host = url.host();
    this.port = url.port();
  }

  @Override
  public boolean isValid(String value, ConstraintValidatorContext context) {
    return false;
  }
}
{code}

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