ProductSeries.java 文件源码

/**
 * Instance Validation. Validates: value brand is a brand.
 * <p>
 * @return null if valid, or a error message
 */
@Null(message = "ViolationMessage is not null, but '${validatedValue}'")
public String getViolationMessage() {
    if ( brand != null && !brand.isBrand() ) return brand.getName() + " is not a Brand";
    return null;
}