injecting-validator

A method annotation (contrast with bean annotation) based validator inspired by JUnit

public class PersonRules {

    private SSNService ssnService;

    @Inject
    public PersonRules(SSNService ssnService) {
        this.ssnService = ssnService;
    }

    @Rule("ssn_required")
    public void validate_ssn_present(@Path("ssn") @Optional String ssn, Result result) {
        if (ssn == null)
            result.fail("SSN is required");
    }

    @Rule("ssn_length")
    public void validate_ssn_length(@Path("ssn") String ssn, Result result) {
        if (ssn.length() != 9)
            result.fail("SSN should be exactly {0} characters", 9);
    }

    @Rule("ssn_unique")
    public void validate_ssn_unique(@Path("ssn") String ssn, Result result) {
        if (ssnService.isKnown(ssn))
            result.fail("There is already an employee registered with SSN {0}", ssn);
    }

    @Rule("name_required")
    public void validate_name_required(@Path("name") @Optional String name, Result result) {
        if (name == null)
            result.fail("Name is required");
    }

    @Rule("name_length")
    public void validate_name_length(@Path("name") String name, Result result) {
        if (name.length() > 25)
            result.fail("Name is too long");
    }

}

Built With

• java