Search fields from superclasses #10504

Modified buildAndBindMemberFields method to use a new
getFieldsInDeclareOrder method that searches fields also from
superclasses. Added a unit test to verify the new logic. Fixes the issue
in ticket #10504

Change-Id: Ic855e274c5b4d1c83760d6c2c53c67413a1da42c

2 files changed, 59 insertions, 3 deletions

diff --git a/server/src/com/vaadin/data/fieldgroup/FieldGroup.java b/server/src/com/vaadin/data/fieldgroup/FieldGroup.java
index 51cd3126cb..8803054857 100644
--- a/server/src/com/vaadin/data/fieldgroup/FieldGroup.java
+++ b/server/src/com/vaadin/data/fieldgroup/FieldGroup.java
@@ -794,8 +794,7 @@ public class FieldGroup implements Serializable {
             boolean buildFields) throws BindException {
         Class<?> objectClass = objectWithMemberFields.getClass();
 
-        for (java.lang.reflect.Field memberField : objectClass
-                .getDeclaredFields()) {
+        for (java.lang.reflect.Field memberField : getFieldsInDeclareOrder(objectClass)) {
 
             if (!Field.class.isAssignableFrom(memberField.getType())) {
                 // Process next field
@@ -1001,4 +1000,27 @@ public class FieldGroup implements Serializable {
         field.setCaption(caption);
         return field;
     }
-}
\ No newline at end of file
+
+    /**
+     * Returns an array containing Field objects reflecting all the fields of
+     * the class or interface represented by this Class object. The elements in
+     * the array returned are sorted in declare order from sub class to super
+     * class.
+     * 
+     * @param searchClass
+     * @return
+     */
+    protected static List<java.lang.reflect.Field> getFieldsInDeclareOrder(
+            Class searchClass) {
+        ArrayList<java.lang.reflect.Field> memberFieldInOrder = new ArrayList<java.lang.reflect.Field>();
+
+        while (searchClass != null) {
+            for (java.lang.reflect.Field memberField : searchClass
+                    .getDeclaredFields()) {
+                memberFieldInOrder.add(memberField);
+            }
+            searchClass = searchClass.getSuperclass();
+        }
+        return memberFieldInOrder;
+    }
+}
diff --git a/server/tests/src/com/vaadin/data/util/ReflectToolsGetSuperField.java b/server/tests/src/com/vaadin/data/util/ReflectToolsGetSuperField.java
new file mode 100644
index 0000000000..efba6085ac
--- /dev/null
+++ b/server/tests/src/com/vaadin/data/util/ReflectToolsGetSuperField.java
@@ -0,0 +1,34 @@
+package com.vaadin.data.util;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+import com.vaadin.data.fieldgroup.FieldGroup;
+import com.vaadin.data.fieldgroup.PropertyId;
+import com.vaadin.ui.TextField;
+
+public class ReflectToolsGetSuperField {
+
+    @Test
+    public void getFieldFromSuperClass() {
+        class MyClass {
+            @PropertyId("testProperty")
+            TextField test = new TextField("This is a test");
+        }
+        class MySubClass extends MyClass {
+            // no fields here
+        }
+        
+        PropertysetItem item = new PropertysetItem();
+        item.addItemProperty("testProperty", new ObjectProperty<String>("Value of testProperty"));
+        
+        MySubClass form = new MySubClass();
+        
+        FieldGroup binder = new FieldGroup(item);
+        binder.bindMemberFields(form);
+        
+        assertTrue("Value of testProperty".equals(form.test.getValue()));
+    }
+
+}