http://www.dropwizard.io/2.0.18/dropwizard-bom/dropwizard-dependencies/dropwizard-parent/dropwizard-validation: Dropwizard is a Java framework for developing ops-friendly, high-performance, RESTful web applications.
  • Coda Hale
  • Nick Telford
  • Graham O'Regan
  • Ryan Kennedy
  • Camille Fournier
  • Carlo Barbara
  • Matt Veitas
  • Ryan Tenney
  • Jochen Schalanda
  • Glenn McAllister
  • Nick Babcock
  • Justin Plock
  • Artem Prigoda 
package io.dropwizard.validation;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;


Allow 0 to indicate dynamic port range allocation. If not zero, it must be within the {min,max}
range, inclusive.

/**
 * Allow 0 to indicate dynamic port range allocation. If not zero, it must be within the {min,max}
 * range, inclusive.
 */
public class PortRangeValidator implements ConstraintValidator<PortRange, Integer> {
    private int min;
    private int max;

    @Override
    public void initialize(PortRange constraintAnnotation) {
        this.min = constraintAnnotation.min();
        this.max = constraintAnnotation.max();
    }

    @Override
    public boolean isValid(Integer value, ConstraintValidatorContext context) {
        return value == 0 || (value >= min && value <= max);
    }
}