1.5. Annotating your domain model
Since you are already familiar with annotations now, the syntax should be very familiar
public class Address {
private String line1;
private String line2;
private String zip;
private String state;
private String country;
private long id;
// a not null string of 20 characters maximum
@Length(max=20)
@NotNull
public String getCountry() {
return country;
}
// a non null string
@NotNull
public String getLine1() {
return line1;
}
//no constraint
public String getLine2() {
return line2;
}
// a not null string of 3 characters maximum
@Length(max=3) @NotNull
public String getState() {
return state;
}
// a not null numeric string of 5 characters maximum
// if the string is longer, the message will
//be searched in the resource bundle at key 'long'
@Length(max=5, message="{long}")
@Pattern(regex="[0-9]+")
@NotNull
public String getZip() {
return zip;
}
// should always be true
@AssertTrue
public boolean isValid() {
return true;
}
// a numeric between 1 and 2000
@Id @Min(1)
@Range(max=2000)
public long getId() {
return id;
}
}
While the example only shows public property validation, you can also annotate fields of any kind of visibility
@MyBeanConstraint(max=45)
public class Dog {
@AssertTrue private boolean isMale;
@NotNull protected String getName() { ... };
...
}
You can also annotate interfaces. Hibernate Validator will check all superclasses and interfaces extended or implemented by a given bean to read the appropriate validator annotations.
public interface Named {
@NotNull String getName();
...
}
public class Dog implements Named {
@AssertTrue private boolean isMale;
public String getName() { ... };
}
The name property will be checked for nullity when the Dog bean is validated.
