Package nl.datasteel.crudcraft.projection.impl.jpa

Class JpaProjectionExecutor

java.lang.Object

nl.datasteel.crudcraft.projection.impl.jpa.JpaProjectionExecutor

All Implemented Interfaces:

ProjectionExecutor

public class JpaProjectionExecutor
extends Object
implements ProjectionExecutor

JPA-based implementation of ProjectionExecutor using Criteria API.

Constructor Summary

Constructors

Constructor	Description
JpaProjectionExecutor(jakarta.persistence.EntityManager entityManager, CriteriaProjectionBuilder projectionBuilder, ProjectionMetadataRegistry metadataRegistry)	Constructs a new JpaProjectionExecutor with the given parameters.

Method Summary

Modifier and Type	Method	Description
<T, D> ProjectionResult<D>	project(Class<T> entityType, Class<D> dtoType, ProjectionQuery<T> query)	Projects a DTO type from the given entity type using the provided query.

Methods inherited from class java.lang.Object

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

Constructor Details

JpaProjectionExecutor

public JpaProjectionExecutor(jakarta.persistence.EntityManager entityManager,
 CriteriaProjectionBuilder projectionBuilder,
 ProjectionMetadataRegistry metadataRegistry)

Constructs a new JpaProjectionExecutor with the given parameters.

Parameters:

entityManager - the EntityManager to use for executing queries

projectionBuilder - the CriteriaProjectionBuilder to build projection expressions

metadataRegistry - the ProjectionMetadataRegistry to access compile-time generated metadata

Method Details

project

public <T,
D> ProjectionResult<D> project(Class<T> entityType,
 Class<D> dtoType,
 ProjectionQuery<T> query)

Projects a DTO type from the given entity type using the provided query. This method constructs a JPA Criteria query to select the DTO and its ID, applying any filters and pagination specified in the query.

Specified by:

project in interface ProjectionExecutor

Type Parameters:

T - entity type

D - dto type

Parameters:

entityType - the entity class

dtoType - the DTO class to project to

query - the projection query definition

Returns:

result containing the projected DTOs