petvalidator.java

Java/J2EE application framework based on [Expert One-on-One J2EE Design and Development] by Rod John

package org.springframework.samples.petclinic.validation;

import org.springframework.samples.petclinic.Pet;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;

/**
 * JavaBean <code>Validator</code> for <code>Pet</code> Forms.
 *
 * @author Ken Krebs
 */
public class PetValidator implements Validator {

	public boolean supports(Class clazz) {
		return Pet.class.isAssignableFrom(clazz);
	}

	public void validate(Object obj, Errors errors) {
		Pet pet = (Pet) obj;
		String name = pet.getName();
		if (name == null || "".equals(name)) {
			errors.rejectValue("name", "required", null, "required");
		}
		if (pet.isNew() && pet.getOwner().getPet(name, true) != null) {
			errors.rejectValue("name", "duplicate", null, "already exists");
		}
	}

}