ValidationHelper.java

package no.niths.common.helpers;

import java.util.List;
import java.util.Set;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;

import no.niths.application.rest.exception.ObjectNotFoundException;
import no.niths.application.rest.helper.Error;
import no.niths.domain.school.Committee;
import no.niths.domain.school.Student;
/**
 * Class used too validate objects
 *
 */
public class ValidationHelper {


    public static boolean isObjectNull(Object obj) {
        if (obj == null) {
            throw new ObjectNotFoundException();
        }
        return false;
    }
    
    public static boolean isObjectNull(Object obj, Class<?> clazz) {
        if (obj == null) {
            throw new ObjectNotFoundException(
                    buildErrorMsg(clazz, Error.DOES_NOT_EXIST));
        }
        return false;
    }


    /**
     * 
     * @param committee
     * @param studentLeader
     */
    public static boolean isStudentLeaderInCommittee(Committee committee,
            Student studentLeader) {
        isObjectNull(committee);
        if (!(committee.getLeaders().contains(studentLeader))) {
            throw new ObjectNotFoundException();
        }
        return false;
    }

    public static boolean isListEmpty(
            @SuppressWarnings("rawtypes") List list) {
        if (list.isEmpty()) {
            throw new ObjectNotFoundException();
        }
        return false;
    }
    
    //Returns true if the object has passed bean validation
    public static <T> boolean hasObjectValidAttributes(T obj){
        ValidatorFactory factory =
                  Validation.buildDefaultValidatorFactory();
        Validator validator = factory.getValidator();
        Set<ConstraintViolation<T>> constraintViolations =
                   validator.validate(obj);
        
        return (constraintViolations.isEmpty());
    }

    private static String buildErrorMsg(Class<?> clazz, Error error) {
        return String.format("%s %s", clazz.getSimpleName(), error.getMsg());
    }
}