DATACMNS-1354 - BasicPersistentEntity now exposes means to override the fallback IsNewStrategy.

This is useful in case a particular store implementation needs to customize the default is new detection.

src/main/java/org/springframework/data/mapping/model/BasicPersistentEntity.java

@@ -131,7 +131,8 @@ public class BasicPersistentEntity<T, P extends PersistentProperty<P>> implement
 		this.typeAlias = Lazy.of(() -> getAliasFromAnnotation(getType()));
 		this.isNewStrategy = Lazy.of(() -> Persistable.class.isAssignableFrom(information.getType()) //
 				? PersistableIsNewStrategy.INSTANCE
-				: PersistentEntityIsNewStrategy.of(this));
+				: getFallbackIsNewStrategy());
+
 		this.isImmutable = Lazy.of(() -> isAnnotationPresent(Immutable.class));
 	}
 
@@ -520,6 +521,18 @@ public class BasicPersistentEntity<T, P extends PersistentProperty<P>> implement
 		return evaluationContextProvider.getEvaluationContext(rootObject);
 	}
 
+	/**
+	 * Returns the default {@link IsNewStrategy} to be used. Will be a {@link PersistentEntityIsNewStrategy} by default.
+	 * Note, that this strategy only gets used if the entity doesn't implement {@link Persistable} as this indicates the
+	 * user wants to be in control over whether an entity is new or not.
+	 * 
+	 * @return
+	 * @since 2.1
+	 */
+	protected IsNewStrategy getFallbackIsNewStrategy() {
+		return PersistentEntityIsNewStrategy.of(this);
+	}
+
 	/**
 	 * Verifies the given bean type to no be {@literal null} and of the type of the current {@link PersistentEntity}.
 	 *