src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemController.java

@@ -13,10 +13,10 @@ import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder;
 
 import java.util.List;
-import java.util.Map;
 import java.util.UUID;
 import java.util.function.BiConsumer;
 
+import static net.hostsharing.hsadminng.mapper.EntityPatcher.castToKeyValueMap;
 import static net.hostsharing.hsadminng.mapper.PostgresDateRange.toPostgresDateRange;
 
 @RestController
@@ -126,6 +126,6 @@ public class HsBookingItemController implements HsBookingItemsApi {
     @SuppressWarnings("unchecked")
     final BiConsumer<HsBookingItemInsertResource, HsBookingItemEntity> RESOURCE_TO_ENTITY_POSTMAPPER = (resource, entity) -> {
         entity.setValidity(toPostgresDateRange(resource.getValidFrom(), resource.getValidTo()));
-        entity.putResources((Map<String, Object>) resource.getResources());
+        entity.putResources(castToKeyValueMap(resource.getResources()));
     };
 }

src/main/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemEntityPatcher.java

@@ -4,9 +4,10 @@ import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsBookingItem
 import net.hostsharing.hsadminng.mapper.EntityPatcher;
 import net.hostsharing.hsadminng.mapper.OptionalFromJson;
 
-import java.util.Map;
 import java.util.Optional;
 
+import static net.hostsharing.hsadminng.mapper.EntityPatcher.castToKeyValueMap;
+
 public class HsBookingItemEntityPatcher implements EntityPatcher<HsBookingItemPatchResource> {
 
     private final HsBookingItemEntity entity;
@@ -26,13 +27,4 @@ public class HsBookingItemEntityPatcher implements EntityPatcher<HsBookingItemPa
         OptionalFromJson.of(resource.getValidTo())
                 .ifPresent(entity::setValidTo);
     }
-
-    @SuppressWarnings("unchecked")
-    static Map<String, Object> castToKeyValueMap(final Object obj) {
-        if (obj instanceof Map<?, ?>) {
-            return (Map<String, Object>) obj;
-        }
-        throw new ClassCastException("Map expected, but got: " + obj);
-    }
-
 }

src/main/java/net/hostsharing/hsadminng/mapper/EntityPatcher.java

@@ -1,6 +1,17 @@
 package net.hostsharing.hsadminng.mapper;
 
+import java.util.Map;
+
 public interface EntityPatcher<R> {
 
     void apply(R resource);
+
+    @SuppressWarnings("unchecked")
+    public static Map<String, Object> castToKeyValueMap(final Object obj) {
+        if (obj instanceof Map<?, ?>) {
+            return (Map<String, Object>) obj;
+        }
+        throw new ClassCastException("Map expected, but got: " + obj);
+    }
+
 }

src/test/java/net/hostsharing/hsadminng/hs/booking/item/HsBookingItemEntityPatcherUnitTest.java

@@ -16,8 +16,8 @@ import java.util.Map;
 import java.util.UUID;
 import java.util.stream.Stream;
 
-import static net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntityPatcher.castToKeyValueMap;
 import static net.hostsharing.hsadminng.hs.office.debitor.TestHsOfficeDebitor.TEST_DEBITOR;
+import static net.hostsharing.hsadminng.mapper.EntityPatcher.castToKeyValueMap;
 import static net.hostsharing.hsadminng.mapper.PatchMap.entry;
 import static net.hostsharing.hsadminng.mapper.PatchMap.patchMap;
 import static org.junit.jupiter.api.TestInstance.Lifecycle.PER_CLASS;