Support references in concrete document types

2 files changed, 24 insertions, 0 deletions

diff --git a/document/src/main/java/com/yahoo/document/datatypes/ReferenceFieldValue.java b/document/src/main/java/com/yahoo/document/datatypes/ReferenceFieldValue.java
index 5d65b25499c..459681d52ae 100644
--- a/document/src/main/java/com/yahoo/document/datatypes/ReferenceFieldValue.java
+++ b/document/src/main/java/com/yahoo/document/datatypes/ReferenceFieldValue.java
@@ -151,4 +151,15 @@ public class ReferenceFieldValue extends FieldValue {
     public void deserialize(Field field, FieldReader reader) {
         reader.read(field, this);
     }
+
+    /**
+     * Expose target document ID as this value's wrapped value. Primarily implemented to
+     * allow for transparent interoperability when used in concrete document types.
+     *
+     * @return reference DocumentId, or null if none has been set
+     */
+    @Override
+    public Object getWrappedValue() {
+        return documentId.orElse(null);
+    }
 }
diff --git a/document/src/test/java/com/yahoo/document/datatypes/ReferenceFieldValueTestCase.java b/document/src/test/java/com/yahoo/document/datatypes/ReferenceFieldValueTestCase.java
index daa65d6e95e..a1d69238463 100644
--- a/document/src/test/java/com/yahoo/document/datatypes/ReferenceFieldValueTestCase.java
+++ b/document/src/test/java/com/yahoo/document/datatypes/ReferenceFieldValueTestCase.java
@@ -13,6 +13,7 @@ import org.junit.rules.ExpectedException;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 /**
@@ -189,4 +190,16 @@ public class ReferenceFieldValueTestCase {
         value.assign(newId);
     }
 
+    @Test
+    public void exposed_wrapped_value_is_null_for_empty_reference() {
+        ReferenceFieldValue nullRef = new ReferenceFieldValue(referenceTypeFoo());
+        assertNull(nullRef.getWrappedValue());
+    }
+
+    @Test
+    public void expose_wrapped_value_is_doc_id_for_non_empty_reference() {
+        ReferenceFieldValue idRef = new ReferenceFieldValue(referenceTypeFoo(), docId("id:ns:foo::toad"));
+        assertEquals(docId("id:ns:foo::toad"), idRef.getWrappedValue());
+    }
+
 }