Package nl.datasteel.crudcraft.projection.impl

Class CollectionHydrator

java.lang.Object

nl.datasteel.crudcraft.projection.impl.CollectionHydrator

public final class CollectionHydrator
extends Object

Utility class that hydrates collection attributes for projection DTOs.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final record	CollectionHydrator.FetchResult	Result returned by the CollectionHydrator.RowFetcher containing the fetched rows and the Java types of the joined associations.
static interface	CollectionHydrator.RowFetcher	Functional interface used to fetch collection data for a given entity type.

Method Summary

Modifier and Type	Method	Description
static <T, D> void	hydrateCollections(Class<T> entityType, ProjectionMetadata<D> metadata, Map<Object,D> dtoMap, CollectionHydrator.RowFetcher fetcher)	Hydrates collection attributes in the DTO map by fetching the necessary data from the database.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

hydrateCollections

public static <T,
D> void hydrateCollections(Class<T> entityType,
 ProjectionMetadata<D> metadata,
 Map<Object,D> dtoMap,
 CollectionHydrator.RowFetcher fetcher)

Hydrates collection attributes in the DTO map by fetching the necessary data from the database.

Parameters:

entityType - the type of the entity being projected

metadata - the projection metadata for the DTO type

dtoMap - a map of IDs to DTO instances to hydrate

fetcher - a function that fetches collection data for the given entity type