CommonValidator.java

/**
 * Class for validation of any fields on null.
 * It helps to avoid of duplicate code.
 *
 */
public interface CommonValidator {

    /**
     * Validate some object for null and throw ValidationException when validation failed.
     *
     * @param object     - object for validate
     * @param objectName - validation object name
     * @param clazzz     -  class where validator was called
     */
    static void validateObjectOnNull(final Object object, final String objectName, final Class clazzz) {

        if (Objects.isNull(object)) {
            throw new ValidationException(clazzz, objectName, objectName + " == null", "NPE");
        }
    }

    /**
     * Validate some object for null and return boolean result.
     *
     * @param object - object for validate
     * @return object == null ? true : false
     */
    static boolean validateObjectOnNullReturnBoolean(final Object object) {
        return Objects.isNull(object);
    }

    /**
     * Validate some objects for null and return boolean result.
     *
     * @param objects - objects for validation
     * @return boolean result
     * @Test not tested.
     */
    static boolean validateObjectsOnNullReturnBoolean(final Object... objects) {
        /*return objects.length == 1
            ? validateObjectOnNullReturnBoolean(objects[0])
            : Stream.of(objects).noneMatch(Objects::isNull);*/
        return Stream.of(objects).anyMatch(CommonValidator::validateObjectOnNullReturnBoolean);
    }
}