#249

Committed 04 Feb 2025 12:47PM UTC coverage: 79.542% (+1.6%) from 77.969%

Build # #249

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fixes and test

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/src/main/java/io/github/wistefan/mapping/EntityVOMapper.java

package io.github.wistefan.mapping;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import io.github.wistefan.mapping.annotations.AttributeSetter;
import io.github.wistefan.mapping.annotations.AttributeType;
import io.github.wistefan.mapping.annotations.MappingEnabled;
import io.github.wistefan.mapping.annotations.UnmappedPropertiesSetter;
import lombok.extern.slf4j.Slf4j;
import org.fiware.ngsi.model.*;
import reactor.core.publisher.Mono;

import javax.inject.Singleton;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URI;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Mapper to handle translation from NGSI-LD entities to Java-Objects, based on annotations added to the target class
 */
@Slf4j
@Singleton
public class EntityVOMapper extends Mapper {

        private static final List<String> WELL_KNOWN_PROPERTIES = List.of(EntityVO.JSON_PROPERTY_MODIFIED_AT, EntityVO.JSON_PROPERTY_CREATED_AT, EntityVO.JSON_PROPERTY_LOCATION, EntityVO.JSON_PROPERTY_OBSERVATION_SPACE, EntityVO.JSON_PROPERTY_OPERATION_SPACE, EntityVO.JSON_PROPERTY_DELETED_AT);

        private final MappingProperties mappingProperties;
        private final ObjectMapper objectMapper;
        private final EntitiesRepository entitiesRepository;

        public EntityVOMapper(MappingProperties mappingProperties, ObjectMapper objectMapper, EntitiesRepository entitiesRepository) {
                this.mappingProperties = mappingProperties;
                this.objectMapper = objectMapper;
                this.entitiesRepository = entitiesRepository;
                this.objectMapper
                                .addMixIn(AdditionalPropertyVO.class, AdditionalPropertyMixin.class);

                this.objectMapper.registerModule(new SimpleModule().addDeserializer(GeoQueryVO.class,
                                new GeoQueryDeserializer()));

                this.objectMapper.findAndRegisterModules();
        }

        /**
         * Method to convert a Java-Object to Map representation
         *
         * @param entity the entity to be converted
         * @return the converted map
         */
        public <T> Map<String, Object> convertEntityToMap(T entity) {
                return objectMapper.convertValue(entity, new TypeReference<>() {
                });
        }

        /**
         * Translate the given object into a Subscription.
         *
         * @param subscription the object representing the subscription
         * @param <T>          class of the subscription
         * @return the NGSI-LD subscription object
         */
        public <T> SubscriptionVO toSubscriptionVO(T subscription) {
                isMappingEnabled(subscription.getClass())
                                .orElseThrow(() -> new UnsupportedOperationException(
                                                String.format("Generic mapping to NGSI-LD subscriptions is not supported for object %s",
                                                                subscription)));

                SubscriptionVO subscriptionVO = objectMapper.convertValue(subscription, SubscriptionVO.class);
                subscriptionVO.setAtContext(mappingProperties.getContextUrl());

                return subscriptionVO;
        }

        /**
         * Method to map an NGSI-LD Entity into a Java-Object of class targetClass. The class has to provide a string constructor to receive the entity id
         *
         * @param entityVO    the NGSI-LD entity to be mapped
         * @param targetClass class of the target object
         * @param <T>         generic type of the target object, has to extend provide a string-constructor to receive the entity id
         * @return the mapped object
         */
        public <T> Mono<T> fromEntityVO(EntityVO entityVO, Class<T> targetClass) {

                Optional<MappingEnabled> optionalMappingEnabled = isMappingEnabled(targetClass);
                if (!optionalMappingEnabled.isPresent()) {
                        return Mono.error(new MappingException(String.format("Mapping is not enabled for class %s", targetClass)));
                }

                MappingEnabled mappingEnabled = optionalMappingEnabled.get();

                if (!Arrays.stream(mappingEnabled.entityType()).toList().contains(entityVO.getType())) {
                        return Mono.error(new MappingException(String.format("Entity and Class type do not match - %s vs %s.", entityVO.getType(), Arrays.asList(mappingEnabled.entityType()))));
                }
                Map<String, AdditionalPropertyVO> additionalPropertyVOMap = Optional.ofNullable(entityVO.getAdditionalProperties()).orElse(Map.of());

                return getRelationshipMap(additionalPropertyVOMap, targetClass)
                                .flatMap(relationshipMap -> fromEntityVO(entityVO, targetClass, relationshipMap));

        }

        /**
         * Return a single, emitting the entities associated with relationships in the given properties maps
         *
         * @param propertiesMap properties map to evaluate
         * @param targetClass   class of the target object
         * @param <T>           the class
         * @return a single, emitting the map of related entities
         */
        private <T> Mono<Map<String, EntityVO>> getRelationshipMap(Map<String, AdditionalPropertyVO> propertiesMap, Class<T> targetClass) {
                return Optional.ofNullable(entitiesRepository.getEntities(getRelationshipObjects(propertiesMap, targetClass)))
                                .orElse(Mono.just(List.of()))
                                .switchIfEmpty(Mono.just(List.of()))
                                .map(relationshipsList -> relationshipsList.stream()
                                                .map(EntityVO.class::cast)
                                                .filter(distinctByKey(e -> e.getId()))
                                                .collect(Collectors.toMap(e -> e.getId().toString(), e -> e)))
                                .defaultIfEmpty(Map.of());
        }

        private static <T> Predicate<T> distinctByKey(Function<? super T, Object> keyExtractor) {
                Map<Object, Boolean> seen = new ConcurrentHashMap<>();
                return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
        }

        /**
         * Create the actual object from the entity, after its relations are evaluated.
         *
         * @param entityVO        entity to create the object from
         * @param targetClass     class of the object to be created
         * @param relationShipMap all entities (directly) related to the objects. Sub relationships(e.g. relationships of properties) will be evaluated downstream.
         * @param <T>             the class
         * @return a single, emitting the actual object.
         */
        private <T> Mono<T> fromEntityVO(EntityVO entityVO, Class<T> targetClass, Map<String, EntityVO> relationShipMap) {
                try {
                        Constructor<T> objectConstructor = targetClass.getDeclaredConstructor(String.class);
                        T constructedObject = objectConstructor.newInstance(entityVO.getId().toString());

                        // handle "well-known" properties
                        Map<String, AdditionalPropertyVO> propertiesMap = new LinkedHashMap<>();
                        propertiesMap.put(EntityVO.JSON_PROPERTY_LOCATION, entityVO.getLocation());
                        propertiesMap.put(EntityVO.JSON_PROPERTY_OBSERVATION_SPACE, entityVO.getObservationSpace());
                        propertiesMap.put(EntityVO.JSON_PROPERTY_OPERATION_SPACE, entityVO.getOperationSpace());
                        propertiesMap.put(EntityVO.JSON_PROPERTY_CREATED_AT, propertyVOFromValue(entityVO.getCreatedAt()));
                        propertiesMap.put(EntityVO.JSON_PROPERTY_MODIFIED_AT, propertyVOFromValue(entityVO.getModifiedAt()));
                        Optional.ofNullable(entityVO.getAdditionalProperties()).ifPresent(propertiesMap::putAll);


                        List<Mono<T>> singleInvocations = propertiesMap.entrySet().stream()
                                        .map(entry -> getObjectInvocation(entry, constructedObject, relationShipMap, entityVO.getId().toString()))
                                        .toList();

                        Optional<Method> unmappedPropertiesSetter = getUnmappedPropertiesSetter(constructedObject);
                        if (unmappedPropertiesSetter.isPresent()) {
                                List<Map.Entry<String, AdditionalPropertyVO>> unmappedProperties = propertiesMap.entrySet()
                                                .stream()
                                                .filter(entry -> getCorrespondingSetterMethod(constructedObject, entry.getKey()).isEmpty())
                                                .filter(entry -> !isWellKnownProperty(entry.getKey()))
                                                .toList();
                                singleInvocations = new ArrayList<>(singleInvocations);
                                singleInvocations.add(
                                                invokeWithExceptionHandling(unmappedPropertiesSetter.get(), constructedObject, toUnmappedProperties(unmappedProperties)));
                        }

                        return Mono.zip(singleInvocations, constructedObjects -> constructedObject);

                } catch (NoSuchMethodException e) {
                        return Mono.error(new MappingException(String.format("The class %s does not declare the required String id constructor.", targetClass)));
                } catch (InvocationTargetException | InstantiationException | IllegalAccessException e) {
                        return Mono.error(new MappingException(String.format("Was not able to create instance of %s.", targetClass), e));
                }
        }

        private boolean isWellKnownProperty(String propertyName) {
                return WELL_KNOWN_PROPERTIES.contains(propertyName);
        }

        public NotificationVO readNotificationFromJSON(String json) throws JsonProcessingException {
                return objectMapper.readValue(json, NotificationVO.class);
        }

        /**
         * Helper method to create a propertyVO for well-known(thus flat) properties
         *
         * @param value the value to wrap
         * @return a propertyVO containing the value
         */
        private PropertyVO propertyVOFromValue(Object value) {
                PropertyVO propertyVO = new PropertyVO();
                propertyVO.setValue(value);
                return propertyVO;
        }

        /**
         * Get the invocation on the object to be constructed.
         *
         * @param entry                   additional properties entry
         * @param objectUnderConstruction the new object, to be filled with the values
         * @param relationShipMap         map of pre-evaluated relations
         * @param entityId                id of the entity
         * @param <T>                     class of the constructed object
         * @return single, emmiting the constructed object
         */
        private <T> Mono<T> getObjectInvocation(Map.Entry<String, AdditionalPropertyVO> entry, T objectUnderConstruction, Map<String, EntityVO> relationShipMap, String entityId) {
                Optional<Method> optionalSetter = getCorrespondingSetterMethod(objectUnderConstruction, entry.getKey());
                if (optionalSetter.isEmpty()) {
                        log.debug("Ignoring property {} for entity {} since there is no mapping configured.", entry.getKey(), entityId);
                        return Mono.just(objectUnderConstruction);
                }
                Method setterMethod = optionalSetter.get();

                Optional<AttributeSetter> optionalAttributeSetter = getAttributeSetterAnnotation(setterMethod);
                if (optionalAttributeSetter.isEmpty()) {
                        log.debug("Ignoring property {} for entity {} since there is no attribute setter configured.", entry.getKey(), entityId);
                        return Mono.just(objectUnderConstruction);
                }
                AttributeSetter setterAnnotation = optionalAttributeSetter.get();

                Class<?> parameterType = getParameterType(setterMethod.getParameterTypes());

                return switch (setterAnnotation.value()) {
                        case PROPERTY, GEO_PROPERTY ->
                                        handleProperty(entry.getValue(), objectUnderConstruction, optionalSetter.get(), parameterType);
                        case PROPERTY_LIST ->
                                        handlePropertyList(entry.getValue(), objectUnderConstruction, optionalSetter.get(), setterAnnotation);
                        case RELATIONSHIP ->
                                        handleRelationship(entry.getValue(), objectUnderConstruction, relationShipMap, optionalSetter.get(), setterAnnotation);
                        case RELATIONSHIP_LIST ->
                                        handleRelationshipList(entry.getValue(), objectUnderConstruction, relationShipMap, optionalSetter.get(), setterAnnotation);
                        default ->
                                        Mono.error(new MappingException(String.format("Received type %s is not supported.", setterAnnotation.value())));
                };
        }

        private List<UnmappedProperty> toUnmappedProperties(List<Map.Entry<String, AdditionalPropertyVO>> unmappedAdditionalProperties) {
                return unmappedAdditionalProperties
                                .stream()
                                .map(this::toUnmappedProperty)
                                .toList();

        }

        private UnmappedProperty toUnmappedProperty(Map.Entry<String, AdditionalPropertyVO> unmappedAdditionalProperty) {
                UnmappedProperty unmappedProperty = new UnmappedProperty();
                unmappedProperty.setName(unmappedAdditionalProperty.getKey());
                if (unmappedAdditionalProperty.getValue() instanceof PropertyListVO propertyListVO) {
                        unmappedProperty.setValue(
                                        propertyListVO.stream()
                                                        .map(PropertyVO::getValue)
                                                        .toList());
                } else if (unmappedAdditionalProperty.getValue() instanceof PropertyVO propertyVO) {
                        unmappedProperty.setValue(propertyVO.getValue());
                }
                return unmappedProperty;
        }

        /**
         * Handle the evaluation of a property entry. Returns a single, emitting the target object, while invoking the property setting method.
         *
         * @param propertyValue           the value of the property
         * @param objectUnderConstruction the object under construction
         * @param setter                  the setter to be used for the property
         * @param parameterType           type of the property in the target object
         * @param <T>                     class of the object under construction
         * @return the single, emitting the objectUnderConstruction
         */
        private <T> Mono<T> handleProperty(AdditionalPropertyVO propertyValue, T objectUnderConstruction, Method setter, Class<?> parameterType) {
                if (propertyValue instanceof PropertyVO propertyVO) {
                        return invokeWithExceptionHandling(setter, objectUnderConstruction, objectMapper.convertValue(propertyVO.getValue(), parameterType));
                } else if (propertyValue instanceof GeoPropertyVO geoPropertyVO) {
                        return invokeWithExceptionHandling(setter, objectUnderConstruction, objectMapper.convertValue(geoPropertyVO.getValue(), parameterType));
                } else {
                        log.error("Mapping exception");
                        return Mono.error(new MappingException(String.format("The attribute is not a valid property: %s ", propertyValue)));
                }
        }

        /**
         * Handle the evaluation of a property-list entry. Returns a single, emitting the target object, while invoking the property setting method.
         *
         * @param propertyListObject      the object containing the property-list
         * @param objectUnderConstruction the object under construction
         * @param setter                  the setter to be used for the property
         * @param <T>                     class of the object under construction
         * @return the single, emitting the objectUnderConstruction
         */
        private <T> Mono<T> handlePropertyList(AdditionalPropertyVO propertyListObject, T objectUnderConstruction, Method setter, AttributeSetter setterAnnotation) {
                if (propertyListObject instanceof PropertyListVO propertyVOS) {
                        return invokeWithExceptionHandling(setter, objectUnderConstruction, propertyListToTargetClass(propertyVOS, setterAnnotation.targetClass()));
                } else if (propertyListObject instanceof PropertyVO propertyVO) {
                        //we need special handling here, since we have no real property lists(see NGSI-LD issue)
                        // TODO: remove as soon as ngsi-ld does properly support that.
                        if (propertyVO.getValue() instanceof List propertyList) {
                                return invokeWithExceptionHandling(setter, objectUnderConstruction, propertyList.stream()
                                                .map(listValue -> objectMapper.convertValue(listValue, setterAnnotation.targetClass()))
                                                .toList());
                        }
                        PropertyListVO propertyVOS = new PropertyListVO();
                        propertyVOS.add(propertyVO);
                        // in case of single element lists, they are returned as a flat property
                        return invokeWithExceptionHandling(setter, objectUnderConstruction, propertyListToTargetClass(propertyVOS, setterAnnotation.targetClass()));
                } else {
                        return Mono.error(new MappingException(String.format("The attribute is not a valid property list: %v ", propertyListObject)));
                }
        }

        /**
         * Handle the evaluation of a relationship-list entry. Returns a single, emitting the target object, while invoking the property setting method.
         *
         * @param attributeValue          the entry containing the relationship-list
         * @param objectUnderConstruction the object under construction
         * @param relationShipMap         a map containing the pre-evaluated relationships
         * @param setter                  the setter to be used for the property
         * @param setterAnnotation        attribute setter annotation on the method
         * @param <T>                     class of the objectUnderConstruction
         * @return the single, emitting the objectUnderConstruction
         */
        private <T> Mono<T> handleRelationshipList(AdditionalPropertyVO attributeValue, T objectUnderConstruction, Map<String, EntityVO> relationShipMap, Method setter, AttributeSetter setterAnnotation) {
                Class<?> targetClass = setterAnnotation.targetClass();
                if (setterAnnotation.fromProperties()) {
                        Optional<RelationshipVO> optionalRelationshipVO = getRelationshipFromProperty(attributeValue);
                        Optional<RelationshipListVO> optionalRelationshipListVO = getRelationshipListFromProperty(attributeValue);
                        if (optionalRelationshipVO.isPresent()) {
                                return relationshipFromProperties(optionalRelationshipVO.get(), targetClass)
                                                // we return the constructed object, since invoke most likely returns null, which is not allowed on mapper functions
                                                // a list is created, since we have a relationship-list defined by the annotation
                                                .flatMap(relationship -> invokeWithExceptionHandling(setter, objectUnderConstruction, List.of(relationship)));
                        } else if (optionalRelationshipListVO.isPresent()) {
                                return Mono.zip(optionalRelationshipListVO.get().stream().map(relationshipVO -> relationshipFromProperties(relationshipVO, targetClass)).toList(),
                                                                oList -> Arrays.asList(oList).stream().map(targetClass::cast).toList())
                                                // we return the constructed object, since invoke most likely returns null, which is not allowed on mapper functions
                                                .flatMap(relationshipList -> invokeWithExceptionHandling(setter, objectUnderConstruction, relationshipList));
                        } else if (attributeValue instanceof PropertyVO pvo && pvo.getValue() instanceof List<?> vl && vl.isEmpty()) {
                                return Mono.just(objectUnderConstruction);
                        } else {
                                return Mono.error(new MappingException(String.format("Value of the relationship %s is invalid.", attributeValue)));
                        }
                } else {
                        return relationshipListToTargetClass(attributeValue, targetClass, relationShipMap)
                                        .defaultIfEmpty(List.of())
                                        // we return the constructed object, since invoke most likely returns null, which is not allowed on mapper functions
                                        .flatMap(relatedEntities -> invokeWithExceptionHandling(setter, objectUnderConstruction, relatedEntities));
                }
        }

        /**
         * Handle the evaluation of a relationship entry. Returns a single, emitting the target object, while invoking the property setting method.
         *
         * @param relationShip            the object containing the relationship
         * @param objectUnderConstruction the object under construction
         * @param relationShipMap         a map containing the pre-evaluated relationships
         * @param setter                  the setter to be used for the property
         * @param setterAnnotation        attribute setter annotation on the method
         * @param <T>                     class of the objectUnderConstruction
         * @return the single, emitting the objectUnderConstruction
         */
        private <T> Mono<T> handleRelationship(AdditionalPropertyVO relationShip, T objectUnderConstruction, Map<String, EntityVO> relationShipMap, Method setter, AttributeSetter setterAnnotation) {
                Class<?> targetClass = setterAnnotation.targetClass();
                if (relationShip instanceof RelationshipVO relationshipVO) {
                        if (setterAnnotation.fromProperties()) {
                                return relationshipFromProperties(relationshipVO, targetClass)
                                                // we return the constructed object, since invoke most likely returns null, which is not allowed on mapper functions
                                                .flatMap(relatedEntity -> invokeWithExceptionHandling(setter, objectUnderConstruction, relatedEntity));
                        } else {
                                return getObjectFromRelationship(relationshipVO, targetClass, relationShipMap, relationshipVO.getAdditionalProperties())
                                                // we return the constructed object, since invoke most likely returns null, which is not allowed on mapper functions
                                                .flatMap(relatedEntity -> invokeWithExceptionHandling(setter, objectUnderConstruction, relatedEntity));
                        }
                } else {
                        return Mono.error(new MappingException(String.format("Did not receive a valid relationship: %s", relationShip)));
                }
        }

        /**
         * Invoke the given method and handle potential exceptions.
         */
        private <T> Mono<T> invokeWithExceptionHandling(Method invocationMethod, T objectUnderConstruction, Object... invocationArgs) {
                try {
                        invocationMethod.invoke(objectUnderConstruction, invocationArgs);
                        return Mono.just(objectUnderConstruction);
                } catch (IllegalAccessException | InvocationTargetException | RuntimeException e) {
                        return Mono.error(new MappingException(String.format("Was not able to invoke method %s.", invocationMethod.getName()), e));
                }
        }

        /**
         * Create the target object of a relationship from its properties(instead of entities additionally retrieved)
         *
         * @param relationshipVO representation of the current relationship(as provided by the original entitiy)
         * @param targetClass    class of the target object to be created(e.g. the object representing the relationship)
         * @param <T>            the class
         * @return a single emitting the object representing the relationship
         */
        private <T> Mono<T> relationshipFromProperties(RelationshipVO relationshipVO, Class<T> targetClass) {
                try {
                        String entityID = relationshipVO.getObject().toString();

                        Constructor<T> objectConstructor = targetClass.getDeclaredConstructor(String.class);
                        T constructedObject = objectConstructor.newInstance(entityID);

                        Map<String, Method> attributeSetters = getAttributeSetterMethodMap(constructedObject);

                        return Mono.zip(attributeSetters.entrySet().stream()
                                        .map(methodEntry -> {
                                                String field = methodEntry.getKey();
                                                Method setterMethod = methodEntry.getValue();
                                                Optional<AttributeSetter> optionalAttributeSetterAnnotation = getAttributeSetterAnnotation(setterMethod);
                                                if (optionalAttributeSetterAnnotation.isEmpty()) {
                                                        // no setter for the field, can be ignored
                                                        log.debug("No setter defined for field {}", field);
                                                        return Mono.just(constructedObject);
                                                }
                                                AttributeSetter setterAnnotation = optionalAttributeSetterAnnotation.get();

                                                Optional<AdditionalPropertyVO> optionalProperty = switch (methodEntry.getKey()) {
                                                        case RelationshipVO.JSON_PROPERTY_OBSERVED_AT ->
                                                                        Optional.ofNullable(relationshipVO.getObservedAt()).map(this::propertyVOFromValue);
                                                        case RelationshipVO.JSON_PROPERTY_CREATED_AT ->
                                                                        Optional.ofNullable(relationshipVO.getCreatedAt()).map(this::propertyVOFromValue);
                                                        case RelationshipVO.JSON_PROPERTY_MODIFIED_AT ->
                                                                        Optional.ofNullable(relationshipVO.getModifiedAt()).map(this::propertyVOFromValue);
                                                        case RelationshipVO.JSON_PROPERTY_DATASET_ID ->
                                                                        Optional.ofNullable(relationshipVO.getDatasetId()).map(this::propertyVOFromValue);
                                                        case RelationshipVO.JSON_PROPERTY_INSTANCE_ID ->
                                                                        Optional.ofNullable(relationshipVO.getInstanceId()).map(this::propertyVOFromValue);
                                                        default -> Optional.empty();
                                                };

                                                // try to find the attribute from the additional properties
                                                if (optionalProperty.isEmpty() && relationshipVO.getAdditionalProperties() != null && relationshipVO.getAdditionalProperties().containsKey(field)) {
                                                        optionalProperty = Optional.ofNullable(relationshipVO.getAdditionalProperties().get(field));
                                                }

                                                return optionalProperty.map(attributeValue ->
                                                                switch (setterAnnotation.value()) {
                                                                        case PROPERTY, GEO_PROPERTY ->
                                                                                        handleProperty(attributeValue, constructedObject, setterMethod, setterAnnotation.targetClass());
                                                                        case RELATIONSHIP ->
                                                                                        getRelationshipMap(relationshipVO.getAdditionalProperties(), targetClass)
                                                                                                        .map(rm -> handleRelationship(attributeValue, constructedObject, rm, setterMethod, setterAnnotation));
                                                                        //resolve objects;
                                                                        case RELATIONSHIP_LIST ->
                                                                                        getRelationshipMap(relationshipVO.getAdditionalProperties(), targetClass)
                                                                                                        .map(rm -> handleRelationshipList(attributeValue, constructedObject, rm, setterMethod, setterAnnotation));
                                                                        case PROPERTY_LIST ->
                                                                                        handlePropertyList(attributeValue, constructedObject, setterMethod, setterAnnotation);
                                                                        default ->
                                                                                        Mono.error(new MappingException(String.format("Received type %s is not supported.", setterAnnotation.value())));
                                                                }).orElse(Mono.just(constructedObject));

                                        }).toList(), constructedObjects -> constructedObject);

                } catch (NoSuchMethodException e) {
                        return Mono.error(new MappingException(String.format("The class %s does not declare the required String id constructor.", targetClass)));
                } catch (InvocationTargetException | InstantiationException | IllegalAccessException e) {
                        return Mono.error(new MappingException(String.format("Was not able to create instance of %s.", targetClass), e));
                }
        }

        /**
         * Returns a list of all entityIDs that are defined as relationships from the given entity.
         *
         * @param additionalProperties map of the properties to evaluate
         * @param targetClass          target class of the mapping
         * @param <T>                  the class
         * @return a list of uris
         */
        private <T> List<URI> getRelationshipObjects(Map<String, AdditionalPropertyVO> additionalProperties, Class<T> targetClass) {
                return Arrays.stream(targetClass.getMethods())
                                .map(this::getAttributeSetterAnnotation)
                                .filter(Optional::isPresent)
                                .map(Optional::get)
                                .filter(a -> (a.value().equals(AttributeType.RELATIONSHIP) || a.value().equals(AttributeType.RELATIONSHIP_LIST)))
                                // we don't need to retrieve entities that should be filled from the properties.
                                .filter(a -> !a.fromProperties())
                                .flatMap(attributeSetter -> getEntityURIsByAttributeSetter(attributeSetter, additionalProperties).stream())
                                .toList();

        }

        /**
         * Evaluate a properties map to get all referenced entity ids
         *
         * @param attributeSetter the attribute setter annotation
         * @param propertiesMap   the properties map to check
         * @return a list of entity ids
         */
        private List<URI> getEntityURIsByAttributeSetter(AttributeSetter attributeSetter, Map<String, AdditionalPropertyVO> propertiesMap) {
                return Optional.ofNullable(propertiesMap.get(attributeSetter.targetName()))
                                .map(this::getURIsFromRelationshipObject)
                                .orElseGet(List::of);
        }

        /**
         * Evaluate a concrete object of a realitonship. If its a list of objects, get the ids of all entities.
         *
         * @param additionalPropertyVO the object to evaluate
         * @return a list of all referenced ids
         */
        private List<URI> getURIsFromRelationshipObject(AdditionalPropertyVO additionalPropertyVO) {
                Optional<RelationshipVO> optionalRelationshipVO = getRelationshipFromProperty(additionalPropertyVO);
                if (optionalRelationshipVO.isPresent()) {
                        // List.of() cannot be used, since we need a mutable list
                        List<URI> uriList = new ArrayList<>();
                        uriList.add(optionalRelationshipVO.get().getObject());
                        return uriList;
                }

                Optional<RelationshipListVO> optionalRelationshipListVO = getRelationshipListFromProperty(additionalPropertyVO);
                if (optionalRelationshipListVO.isPresent()) {
                        return optionalRelationshipListVO.get().stream().flatMap(listEntry -> getURIsFromRelationshipObject(listEntry).stream()).toList();
                }
                return List.of();
        }

        /**
         * Method to translate a Map-Entry(e.g. NGSI-LD relationship) to a typed list as defined by the target object
         *
         * @param entry       attribute of the entity, e.g. a relationship or a list of relationships
         * @param targetClass class to be used as type for the typed list
         * @param <T>         the type
         * @return a list of objects, mapping the relationship
         */
        private <T> Mono<List<T>> relationshipListToTargetClass(AdditionalPropertyVO entry, Class<T> targetClass, Map<String, EntityVO> relationShipEntitiesMap) {

                Optional<RelationshipVO> optionalRelationshipVO = getRelationshipFromProperty(entry);
                if (optionalRelationshipVO.isPresent()) {
                        return getObjectFromRelationship(optionalRelationshipVO.get(), targetClass, relationShipEntitiesMap, optionalRelationshipVO.get().getAdditionalProperties())
                                        .map(List::of);
                }

                Optional<RelationshipListVO> optionalRelationshipListVO = getRelationshipListFromProperty(entry);
                if (optionalRelationshipListVO.isPresent()) {
                        return zipToList(optionalRelationshipListVO.get().stream(), targetClass, relationShipEntitiesMap);
                }
                return Mono.just(List.of());
        }

        private Optional<RelationshipListVO> getRelationshipListFromProperty(AdditionalPropertyVO additionalPropertyVO) {
                if (additionalPropertyVO instanceof RelationshipListVO rsl) {
                        return Optional.of(rsl);
                } else if ((additionalPropertyVO instanceof PropertyVO propertyVO && ((PropertyVO) additionalPropertyVO).getValue() instanceof List<?> propertyListVO && !propertyListVO.isEmpty() && isRelationshipList(propertyVO))) {
                        RelationshipListVO relationshipListVO = new RelationshipListVO();
                        propertyListVO.stream()
                                        .map(value -> objectMapper.convertValue(value, RelationshipVO.class))
                                        .forEach(relationshipListVO::add);
                        return Optional.of(relationshipListVO);

                } else if (additionalPropertyVO instanceof PropertyListVO propertyListVO && !propertyListVO.isEmpty() && isRelationship(propertyListVO.get(0))) {
                        RelationshipListVO relationshipListVO = new RelationshipListVO();
                        propertyListVO.stream()
                                        .map(propertyVO -> objectMapper.convertValue(propertyVO.getValue(), RelationshipVO.class))
                                        .forEach(relationshipListVO::add);
                        return Optional.of(relationshipListVO);
                }
                return Optional.empty();
        }

        private Optional<RelationshipVO> getRelationshipFromProperty(AdditionalPropertyVO additionalPropertyVO) {
                if (additionalPropertyVO instanceof RelationshipVO relationshipVO) {
                        return Optional.of(relationshipVO);
                } else if (additionalPropertyVO instanceof PropertyVO propertyVO && isRelationship(propertyVO)) {
                        return Optional.of(objectMapper.convertValue(propertyVO.getValue(), RelationshipVO.class));
                }
                return Optional.empty();
        }

        private boolean isRelationship(PropertyVO testProperty) {
                return testProperty.getValue() instanceof Map<?, ?> valuesMap && valuesMap.get("type").equals(PropertyTypeVO.RELATIONSHIP.getValue());
        }

        /**
         * Check if the given method handles access to the unmapped properties
         */
        private boolean isUnmappedPropertiesSetter(Method method) {
                return Arrays.stream(method.getAnnotations()).anyMatch(UnmappedPropertiesSetter.class::isInstance);
        }

        private boolean isRelationshipList(PropertyVO testProperty) {
                return testProperty.getValue() instanceof List<?> valuesList &&
                                valuesList.stream()
                                                .allMatch(v -> {
                                                        if (v instanceof Map<?, ?> valueAsMap) {
                                                                return valueAsMap.get("type").equals(PropertyTypeVO.RELATIONSHIP.getValue());
                                                        }
                                                        return false;
                                                });
        }

        /**
         * Helper method for combining the evaluation of relationship entities to a single result lits
         *
         * @param relationshipVOStream    the relationships to evaluate
         * @param targetClass             target class of the relationship object
         * @param relationShipEntitiesMap map of the preevaluated relationship entities
         * @param <T>                     target class of the relationship
         * @return a single emitting the full list
         */
        private <T> Mono<List<T>> zipToList(Stream<RelationshipVO> relationshipVOStream, Class<T> targetClass, Map<String, EntityVO> relationShipEntitiesMap) {
                return Mono.zip(
                                relationshipVOStream.map(RelationshipVO::getObject)
                                                .filter(Objects::nonNull)
                                                .map(URI::toString)
                                                .map(relationShipEntitiesMap::get)
                                                .filter(Objects::nonNull)
                                                .map(entity -> fromEntityVO(entity, targetClass))
                                                .toList(),
                                oList -> Arrays.stream(oList).map(targetClass::cast).toList()
                );
        }

        /**
         * Method to translate a Map-Entry(e.g. NGSI-LD property) to a typed list as defined by the target object
         *
         * @param propertyVOS a list of properties
         * @param targetClass class to be used as type for the typed list
         * @param <T>         the type
         * @return a list of objects, mapping the relationship
         */
        private <T> List<T> propertyListToTargetClass(PropertyListVO propertyVOS, Class<T> targetClass) {
                return propertyVOS.stream().map(propertyEntry -> objectMapper.convertValue(propertyEntry.getValue(), targetClass)).toList();
        }

        /**
         * Retrieve the object from a relationship and return it as a java object of class T. All sub relationships will be evaluated, too.
         *
         * @param relationshipVO the relationship entry
         * @param targetClass    the target-class of the entry
         * @param <T>            the class
         * @return the actual object
         */
        private <T> Mono<T> getObjectFromRelationship(RelationshipVO relationshipVO, Class<T> targetClass, Map<String, EntityVO> relationShipEntitiesMap, Map<String, AdditionalPropertyVO> additionalPropertyVOMap) {
                Optional<EntityVO> optionalEntityVO = Optional.ofNullable(relationShipEntitiesMap.get(relationshipVO.getObject().toString()));
                if (optionalEntityVO.isEmpty() && !mappingProperties.isStrictRelationships()) {
                        try {
                                Constructor<T> objectConstructor = targetClass.getDeclaredConstructor(String.class);
                                T theObject = objectConstructor.newInstance(relationshipVO.getObject().toString());
                                // return the empty object
                                return Mono.just(theObject);
                        } catch (InvocationTargetException | InstantiationException | IllegalAccessException |
                                         NoSuchMethodException e) {
                                return Mono.error(new MappingException(String.format("Was not able to instantiate %s with a string parameter.", targetClass), e));
                        }
                } else if (optionalEntityVO.isEmpty()) {
                        return Mono.error(new MappingException(String.format("Was not able to resolve the relationship %s", relationshipVO.getObject())));
                }

                var entityVO = optionalEntityVO.get();
                //merge with override properties
                if (additionalPropertyVOMap != null) {
                        entityVO.getAdditionalProperties().putAll(additionalPropertyVOMap);
                }
                return fromEntityVO(entityVO, targetClass);
        }

        /**
         * Return the type of the setter's parameter.
         */
        private Class<?> getParameterType(Class<?>[] arrayOfClasses) {
                if (arrayOfClasses.length != 1) {
                        throw new MappingException("Setter method should only have one parameter declared.");
                }
                return arrayOfClasses[0];
        }

        /**
         * Get the setter method for the given property at the entity.
         */
        private <T> Optional<Method> getCorrespondingSetterMethod(T entity, String propertyName) {
                return getAttributeSettersMethods(entity).stream().filter(m ->
                                                getAttributeSetterAnnotation(m)
                                                                .map(attributeSetter -> attributeSetter.targetName().equals(propertyName)).orElse(false))
                                .findFirst();
        }

        /**
         * Get all attribute setters for the given entity
         */
        private <T> List<Method> getAttributeSettersMethods(T entity) {
                return Arrays.stream(entity.getClass().getMethods()).filter(m -> getAttributeSetterAnnotation(m).isPresent()).toList();
        }

        private <T> Optional<Method> getUnmappedPropertiesSetter(T entity) {
                return Arrays.stream(entity.getClass().getMethods())
                                .filter(this::isUnmappedPropertiesSetter).findAny();
        }

        private <T> Map<String, Method> getAttributeSetterMethodMap(T entity) {
                return Arrays.stream(entity.getClass().getMethods())
                                .filter(m -> getAttributeSetterAnnotation(m).isPresent())
                                .collect(Collectors.toMap(m -> getAttributeSetterAnnotation(m).get().targetName(), m -> m));
        }

        /**
         * Get the attribute setter annotation from the given method, if it exists.
         */
        private Optional<AttributeSetter> getAttributeSetterAnnotation(Method m) {
                return Arrays.stream(m.getAnnotations()).filter(AttributeSetter.class::isInstance)
                                .findFirst()
                                .map(AttributeSetter.class::cast);
        }

}

wistefan / ngsi-ld-java-mapping / #249

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