don't allow image and image url at the same time

Author: php-coder

src/main/java/ru/mystamps/web/validation/jsr303/RequireImageOrImageUrl.java

@@ -29,7 +29,7 @@
 import static java.lang.annotation.RetentionPolicy.RUNTIME;
 
 /**
- * Validates that an image or an image URL is specified.
+ * Validates that an image or an image URL is specified but not both.
  *
  * In order to be validated by this validator, target form must implement the
  * {@link HasImageOrImageUrl} interface.

src/main/java/ru/mystamps/web/validation/jsr303/RequireImageOrImageUrlValidator.java

@@ -24,6 +24,7 @@
  * Implementation of the {@link RequireImageOrImageUrl} validator.
  *
  * If an image and an image URL fields are empty, it marks both fields as having an error.
+ * If both fields were filled it also marks them as having an error.
  */
 public class RequireImageOrImageUrlValidator
 	implements ConstraintValidator<RequireImageOrImageUrl, HasImageOrImageUrl> {
@@ -39,12 +40,15 @@ public boolean isValid(HasImageOrImageUrl value, ConstraintValidatorContext ctx)
 		if (value == null) {
 			return true;
 		}
+
+		boolean hasImage    = value.hasImage();
+		boolean hasImageUrl = value.hasImageUrl();
 
-		if (value.hasImage()) {
+		if (hasImage && !hasImageUrl) {
 			return true;
 		}
-		
-		if (value.hasImageUrl()) {
+
+		if (hasImageUrl && !hasImage) {
 			return true;
 		}