Add public Field.isEmpty() and clear() (#15354)

Change-Id: I6bda7ff2a66a9ad172c899d855ca868881600be4

1 files changed, 22 insertions, 0 deletions

diff --git a/server/src/com/vaadin/ui/Field.java b/server/src/com/vaadin/ui/Field.java
index f191e1bdd7..6dee4de6cb 100644
--- a/server/src/com/vaadin/ui/Field.java
+++ b/server/src/com/vaadin/ui/Field.java
@@ -113,4 +113,26 @@ public interface Field<T> extends Component, BufferedValidatable, Property<T>,
             return (Property) getSource();
         }
     }
+
+    /**
+     * Is the field empty?
+     * 
+     * In general, "empty" state is same as null. As an exception, TextField
+     * also treats empty string as "empty".
+     * 
+     * @since
+     * @return true if the field is empty, false otherwise
+     */
+    public boolean isEmpty();
+
+    /**
+     * Clears the value of the field.
+     * <p>
+     * The field value is typically reset to the initial value of the field.
+     * Calling {@link #isEmpty()} on a cleared field must always returns true.
+     * 
+     * @since
+     */
+    public void clear();
+
 }