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

@@ -5,7 +5,9 @@ import net.hostsharing.hsadminng.hs.booking.generated.api.v1.api.HsBookingItemsA
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsBookingItemInsertResource;
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsBookingItemPatchResource;
 import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsBookingItemResource;
+import net.hostsharing.hsadminng.hs.booking.item.validators.BookingItemEntitySaveProcessor;
 import net.hostsharing.hsadminng.hs.booking.item.validators.HsBookingItemEntityValidatorRegistry;
+import net.hostsharing.hsadminng.hs.booking.project.HsBookingProjectRealEntity;
 import net.hostsharing.hsadminng.mapper.KeyValueMap;
 import net.hostsharing.hsadminng.mapper.Mapper;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -48,7 +50,7 @@ public class HsBookingItemController implements HsBookingItemsApi {
 
         final var entities = bookingItemRepo.findAllByProjectUuid(projectUuid);
 
-        final var resources = mapper.mapList(entities, HsBookingItemResource.class, ENTITY_TO_RESOURCE_POSTMAPPER);
+        final var resources = mapper.mapList(entities, HsBookingItemResource.class, RBAC_ENTITY_TO_RESOURCE_POSTMAPPER);
         return ResponseEntity.ok(resources);
     }
 
@@ -62,16 +64,20 @@ public class HsBookingItemController implements HsBookingItemsApi {
         context.define(currentSubject, assumedRoles);
 
         final var entityToSave = mapper.map(body, HsBookingItemRbacEntity.class, RESOURCE_TO_ENTITY_POSTMAPPER);
-
+        final var mapped = new BookingItemEntitySaveProcessor(em, entityToSave)
-        final var saved = HsBookingItemEntityValidatorRegistry.validated(em, bookingItemRepo.save(entityToSave));
+                .preprocessEntity()
+                .validateEntity()
+                .prepareForSave()
+                .save()
+                .validateContext()
+                .mapUsing(e -> mapper.map(e, HsBookingItemResource.class, ITEM_TO_RESOURCE_POSTMAPPER))
+                .revampProperties();
 
         final var uri =
                 MvcUriComponentsBuilder.fromController(getClass())
                         .path("/api/hs/booking/items/{id}")
-                        .buildAndExpand(saved.getUuid())
+                        .buildAndExpand(mapped.getUuid())
                         .toUri();
-        final var mapped = mapper.map(saved, HsBookingItemResource.class, ENTITY_TO_RESOURCE_POSTMAPPER);
-
         return ResponseEntity.created(uri).body(mapped);
     }
 
@@ -88,7 +94,7 @@ public class HsBookingItemController implements HsBookingItemsApi {
         result.ifPresent(entity -> em.detach(entity)); // prevent further LAZY-loading
         return result
                 .map(bookingItemEntity -> ResponseEntity.ok(
-                        mapper.map(bookingItemEntity, HsBookingItemResource.class, ENTITY_TO_RESOURCE_POSTMAPPER)))
+                        mapper.map(bookingItemEntity, HsBookingItemResource.class, RBAC_ENTITY_TO_RESOURCE_POSTMAPPER)))
                 .orElseGet(() -> ResponseEntity.notFound().build());
     }
 
@@ -121,18 +127,21 @@ public class HsBookingItemController implements HsBookingItemsApi {
         new HsBookingItemEntityPatcher(current).apply(body);
 
         final var saved = bookingItemRepo.save(HsBookingItemEntityValidatorRegistry.validated(em, current));
-        final var mapped = mapper.map(saved, HsBookingItemResource.class, ENTITY_TO_RESOURCE_POSTMAPPER);
+        final var mapped = mapper.map(saved, HsBookingItemResource.class, RBAC_ENTITY_TO_RESOURCE_POSTMAPPER);
         return ResponseEntity.ok(mapped);
     }
 
-    final BiConsumer<HsBookingItemRbacEntity, HsBookingItemResource> ENTITY_TO_RESOURCE_POSTMAPPER = (entity, resource) -> {
+    final BiConsumer<HsBookingItem, HsBookingItemResource> ITEM_TO_RESOURCE_POSTMAPPER = (entity, resource) -> {
         resource.setValidFrom(entity.getValidity().lower());
         if (entity.getValidity().hasUpperBound()) {
             resource.setValidTo(entity.getValidity().upper().minusDays(1));
         }
     };
 
+    final BiConsumer<HsBookingItemRbacEntity, HsBookingItemResource> RBAC_ENTITY_TO_RESOURCE_POSTMAPPER = ITEM_TO_RESOURCE_POSTMAPPER::accept;
+
     final BiConsumer<HsBookingItemInsertResource, HsBookingItemRbacEntity> RESOURCE_TO_ENTITY_POSTMAPPER = (resource, entity) -> {
+        entity.setProject(em.getReference(HsBookingProjectRealEntity.class, resource.getProjectUuid()));
         entity.setValidity(toPostgresDateRange(LocalDate.now(), resource.getValidTo()));
         entity.putResources(KeyValueMap.from(resource.getResources()));
     };

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/BookingItemEntitySaveProcessor.java

@@ -0,0 +1,131 @@
+package net.hostsharing.hsadminng.hs.booking.item.validators;
+
+import net.hostsharing.hsadminng.errors.MultiValidationException;
+import net.hostsharing.hsadminng.hs.booking.generated.api.v1.model.HsBookingItemResource;
+import net.hostsharing.hsadminng.hs.booking.item.HsBookingItem;
+import net.hostsharing.hsadminng.hs.validation.HsEntityValidator;
+
+import jakarta.persistence.EntityManager;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.regex.Pattern;
+
+// TODO.refa: introduce common base class with HsHostingAssetEntitySaveProcessor
+/**
+ * Wraps the steps of the pararation, validation, mapping and revamp around saving of a HsBookingItem into a readable API.
+ */
+public class BookingItemEntitySaveProcessor {
+
+    private final HsEntityValidator<HsBookingItem> validator;
+    private String expectedStep = "preprocessEntity";
+    private final EntityManager em;
+    private HsBookingItem entity;
+    private HsBookingItemResource resource;
+
+    public BookingItemEntitySaveProcessor(final EntityManager em, final HsBookingItem entity) {
+        this.em = em;
+        this.entity = entity;
+        this.validator = HsBookingItemEntityValidatorRegistry.forType(entity.getType());
+    }
+
+    /// initial step allowing to set default values before any validations
+    public BookingItemEntitySaveProcessor preprocessEntity() {
+        step("preprocessEntity", "validateEntity");
+        validator.preprocessEntity(entity);
+        return this;
+    }
+
+    /// validates the entity itself including its properties
+    public BookingItemEntitySaveProcessor validateEntity() {
+        step("validateEntity", "prepareForSave");
+        MultiValidationException.throwIfNotEmpty(validator.validateEntity(entity));
+        return this;
+    }
+
+    // TODO.impl: remove once the migration of legacy data is done
+    /// validates the entity itself including its properties, but ignoring some error messages for import of legacy data
+    public BookingItemEntitySaveProcessor validateEntityIgnoring(final String... ignoreRegExp) {
+        step("validateEntity", "prepareForSave");
+        final var ignoreRegExpPatterns = Arrays.stream(ignoreRegExp).map(Pattern::compile).toList();
+        MultiValidationException.throwIfNotEmpty(
+                validator.validateEntity(entity).stream()
+                        .filter(error -> ignoreRegExpPatterns.stream().noneMatch(p -> p.matcher(error).matches() ))
+                        .toList()
+        );
+        return this;
+    }
+
+    /// hashing passwords etc.
+    public BookingItemEntitySaveProcessor prepareForSave() {
+        step("prepareForSave", "save");
+        validator.prepareProperties(em, entity);
+        return this;
+    }
+
+    /**
+     * Saves the entity using the given `saveFunction`.
+     *
+     * <p>`validator.postPersist(em, entity)` is NOT called.
+     * If any postprocessing is necessary, the saveFunction has to implement this.</p>
+     * @param saveFunction
+     * @return this
+     */
+    public BookingItemEntitySaveProcessor saveUsing(final Function<HsBookingItem, HsBookingItem> saveFunction) {
+        step("save", "validateContext");
+        entity = saveFunction.apply(entity);
+        return this;
+    }
+
+    /**
+     * Saves the using the `EntityManager`, but does NOT ever merge the entity.
+     *
+     * <p>`validator.postPersist(em, entity)` is called afterwards with the entity guaranteed to be flushed to the database.</p>
+     * @return this
+     */
+    public BookingItemEntitySaveProcessor save() {
+        return saveUsing(e -> {
+            if (!em.contains(entity)) {
+                em.persist(entity);
+            }
+            em.flush(); // makes RbacEntity available as RealEntity if needed
+            validator.postPersist(em, entity);
+            return entity;
+        });
+    }
+
+    /// validates the entity within it's parent and child hierarchy (e.g. totals validators and other limits)
+    public BookingItemEntitySaveProcessor validateContext() {
+        step("validateContext", "mapUsing");
+        return HsEntityValidator.doWithEntityManager(em, () -> {
+            MultiValidationException.throwIfNotEmpty(validator.validateContext(entity));
+            return this;
+        });
+    }
+
+    /// maps entity to JSON resource representation
+    public BookingItemEntitySaveProcessor mapUsing(
+            final Function<HsBookingItem, HsBookingItemResource> mapFunction) {
+        step("mapUsing", "revampProperties");
+        resource = mapFunction.apply(entity);
+        return this;
+    }
+
+    /// removes write-only-properties and ads computed-properties
+    @SuppressWarnings("unchecked")
+    public HsBookingItemResource revampProperties() {
+        step("revampProperties", null);
+        final var revampedProps = validator.revampProperties(em, entity, (Map<String, Object>) resource.getResources());
+        resource.setResources(revampedProps);
+        return resource;
+    }
+
+    // Makes sure that the steps are called in the correct order.
+    // Could also be implemented using an interface per method, but that seems exaggerated.
+    private void step(final String current, final String next) {
+        if (!expectedStep.equals(current)) {
+            throw new IllegalStateException("expected " + expectedStep + " but got " + current);
+        }
+        expectedStep = next;
+    }
+}

src/main/java/net/hostsharing/hsadminng/hs/booking/item/validators/HsBookingItemEntityValidatorRegistry.java

@@ -48,10 +48,11 @@ public class HsBookingItemEntityValidatorRegistry {
     }
 
     public static List<String> doValidate(final EntityManager em, final HsBookingItem bookingItem) {
+        final var bookingItemValidator = HsBookingItemEntityValidatorRegistry.forType(bookingItem.getType());
         return HsEntityValidator.doWithEntityManager(em, () ->
             HsEntityValidator.sequentiallyValidate(
-                    () -> HsBookingItemEntityValidatorRegistry.forType(bookingItem.getType()).validateEntity(bookingItem),
+                    () -> bookingItemValidator.validateEntity(bookingItem),
-                    () -> HsBookingItemEntityValidatorRegistry.forType(bookingItem.getType()).validateContext(bookingItem))
+                    () -> bookingItemValidator.validateContext(bookingItem))
         );
     }
 

src/main/java/net/hostsharing/hsadminng/hs/validation/HsEntityValidator.java

@@ -130,7 +130,7 @@ public abstract class HsEntityValidator<E extends PropertiesProvider> {
     }
 
     public Map<String, Object> revampProperties(final EntityManager em, final E entity, final Map<String, Object> config) {
-        final var copy = new HashMap<>(config);
+        final var copy = config != null ? new HashMap<>(config) : new HashMap();
         stream(propertyValidators).forEach(p -> {
             if (p.isWriteOnly()) {
                 copy.remove(p.propertyName);

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

@@ -1,6 +1,8 @@
 package net.hostsharing.hsadminng.mapper;
 
 import org.modelmapper.ModelMapper;
+import org.modelmapper.convention.MatchingStrategies;
+import org.modelmapper.spi.MatchingStrategy;
 import org.springframework.util.ReflectionUtils;
 
 import jakarta.persistence.EntityManager;
@@ -8,11 +10,16 @@ import jakarta.persistence.ManyToOne;
 import jakarta.persistence.PersistenceContext;
 import jakarta.validation.ValidationException;
 import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.function.BiConsumer;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
+import static java.util.Arrays.stream;
 import static net.hostsharing.hsadminng.errors.DisplayAs.DisplayName;
+import static org.modelmapper.convention.MatchingStrategies.STRICT;
 
 /**
  * A nicer API for ModelMapper.
@@ -24,6 +31,8 @@ public class Mapper extends ModelMapper {
 
     public Mapper() {
         getConfiguration().setAmbiguityIgnored(true);
+//        getConfiguration().setMatchingStrategy(STRICT);
+//        getConfiguration().setDeepCopyEnabled(true);
     }
 
     public <S, T> List<T> mapList(final List<S> source, final Class<T> targetClass) {
@@ -46,7 +55,7 @@ public class Mapper extends ModelMapper {
     @Override
     public <D> D map(final Object source, final Class<D> destinationType) {
         final var target = super.map(source, destinationType);
-        for (Field f : destinationType.getDeclaredFields()) {
+        for (Field f : getDeclaredFieldsIncludingSuperClasses(destinationType)) {
             if (f.getAnnotation(ManyToOne.class) == null) {
                 continue;
             }
@@ -69,6 +78,17 @@ public class Mapper extends ModelMapper {
         return target;
     }
 
+    private static <D> Field[] getDeclaredFieldsIncludingSuperClasses(final Class<D> destinationType) {
+        if (destinationType == null) {
+            return new Field[0];
+        }
+
+        return Stream.concat(
+                stream(destinationType.getDeclaredFields()),
+                stream(getDeclaredFieldsIncludingSuperClasses(destinationType.getSuperclass())))
+            .toArray(Field[]::new);
+    }
+
     private Object findEntityById(final Class<?> entityClass, final Object subEntityUuid) {
         // using getReference would be more efficent, but results in very technical error messages
         final var entity = em.find(entityClass, subEntityUuid);