Created
May 6, 2012 15:28
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import javax.validation.Constraint; | |
import javax.validation.ConstraintValidator; | |
import javax.validation.ConstraintValidatorContext; | |
import javax.validation.Payload; | |
import javax.validation.constraints.Min; | |
import javax.validation.constraints.NotNull; | |
@Config(desc = "A binary tree") | |
@BinaryTreeConstraint | |
public class BinaryTree { | |
@Id(desc = "id of current node") | |
private String id; | |
@Config(desc = "value of current node") | |
@NotNull | |
@Min(1) | |
private Integer value; | |
@Config(desc = "left child") | |
private BinaryTree left; | |
@Config(desc = "right child") | |
private BinaryTree right; | |
public int getId() { return new Integer(value).intValue(); } | |
public int getValue() { return value.intValue(); } | |
public BinaryTree getLeft() { return left; } | |
public BinaryTree getRight() { return right; } | |
public String toString() { return id + "=" + value; } | |
} | |
public class BinaryTreeValidator implements ConstraintValidator<BinaryTreeConstraint, BinaryTree> { | |
@Override | |
public boolean isValid(BinaryTree n, ConstraintValidatorContext c) { | |
if (n.getLeft() != null && n.getValue() < n.getLeft().getValue()) { | |
String msg = n.getLeft() + " must be to right of " + n; | |
c.buildConstraintViolationWithTemplate(msg).addConstraintViolation(); | |
return false; | |
} | |
if (n.getRight() != null && n.getValue() > n.getRight().getValue()) { | |
String msg = n.getRight() + " must be to left of " + n; | |
c.buildConstraintViolationWithTemplate(msg).addConstraintViolation(); | |
return false; | |
} | |
return true; | |
} | |
@Override | |
public void initialize(BinaryTreeConstraint constraintAnnotation) { | |
} | |
} | |
@Target({ TYPE }) | |
@Retention(RetentionPolicy.RUNTIME) | |
@Constraint(validatedBy = BinaryTreeValidator.class) | |
public @interface BinaryTreeConstraint { | |
String message() default ""; | |
Class<?>[] groups() default {}; | |
Class<? extends Payload>[] payload() default {}; | |
} | |
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