Most validators should accept null or empty string (#10561, #10713).

Change-Id: I1e8d6015aefdc184af6383cb22cdf3e13be351cf

3 files changed, 16 insertions, 16 deletions

diff --git a/server/src/com/vaadin/data/validator/EmailValidator.java b/server/src/com/vaadin/data/validator/EmailValidator.java
index 2217b3cf2c..aa7a921d51 100644
--- a/server/src/com/vaadin/data/validator/EmailValidator.java
+++ b/server/src/com/vaadin/data/validator/EmailValidator.java
@@ -23,6 +23,12 @@ package com.vaadin.data.validator;
  * See {@link com.vaadin.data.validator.AbstractStringValidator} for more
  * information.
  * 
+ * <p>
+ * An empty string or a null is always accepted - use the required flag on
+ * fields or a separate validator (or override {@link #isValidValue(String)}) to
+ * fail on empty values.
+ * </p>
+ * 
  * @author Vaadin Ltd.
  * @since 5.4
  */
@@ -41,19 +47,4 @@ public class EmailValidator extends RegexpValidator {
                 "^([a-zA-Z0-9_\\.\\-+])+@(([a-zA-Z0-9-])+\\.)+([a-zA-Z0-9]{2,4})+$",
                 true, errorMessage);
     }
-
-    /*
-     * (non-Javadoc)
-     * 
-     * @see
-     * com.vaadin.data.validator.AbstractValidator#isValidValue(java.lang.Object
-     * )
-     */
-    @Override
-    protected boolean isValidValue(String value) {
-        if (value == null || value.isEmpty()) {
-            return true;
-        }
-        return super.isValidValue(value);
-    }
 }
diff --git a/server/src/com/vaadin/data/validator/RangeValidator.java b/server/src/com/vaadin/data/validator/RangeValidator.java
index d92e259cf6..5e82a37b51 100644
--- a/server/src/com/vaadin/data/validator/RangeValidator.java
+++ b/server/src/com/vaadin/data/validator/RangeValidator.java
@@ -154,7 +154,8 @@ public class RangeValidator<T extends Comparable> extends AbstractValidator<T> {
      */
     @Override
     protected boolean isValidValue(T value) {
-        if (value == null) {
+        if (value == null
+                || (String.class.equals(getType()) && "".equals(value))) {
             return true;
         }
 
diff --git a/server/src/com/vaadin/data/validator/RegexpValidator.java b/server/src/com/vaadin/data/validator/RegexpValidator.java
index ea659fcfe2..f85bce9281 100644
--- a/server/src/com/vaadin/data/validator/RegexpValidator.java
+++ b/server/src/com/vaadin/data/validator/RegexpValidator.java
@@ -30,6 +30,11 @@ import java.util.regex.Pattern;
  * See {@link com.vaadin.data.validator.AbstractStringValidator} for more
  * information.
  * </p>
+ * <p>
+ * An empty string or a null is always accepted - use the required flag on
+ * fields or a separate validator (or override {@link #isValidValue(String)}) to
+ * fail on empty values.
+ * </p>
  * 
  * @author Vaadin Ltd.
  * @since 5.4
@@ -81,6 +86,9 @@ public class RegexpValidator extends AbstractStringValidator {
      */
     @Override
     protected boolean isValidValue(String value) {
+        if (value == null || value.isEmpty()) {
+            return true;
+        }
         if (complete) {
             return getMatcher(value).matches();
         } else {