SimpleJpaRepository.png
package org.springframework.data.jpa.repository.support;
import static org.springframework.data.jpa.repository.query.QueryUtils.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import javax.persistence.EntityManager;
import javax.persistence.LockModeType;
import javax.persistence.NoResultException;
import javax.persistence.Parameter;
import javax.persistence.Query;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Order;
import javax.persistence.criteria.ParameterExpression;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.convert.QueryByExamplePredicateBuilder;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.data.jpa.provider.PersistenceProvider;
import org.springframework.data.jpa.repository.EntityGraph;
import org.springframework.data.jpa.repository.query.QueryUtils;
import org.springframework.data.jpa.repository.support.QueryHints.NoHints;
import org.springframework.data.repository.support.PageableExecutionUtils;
import org.springframework.lang.Nullable;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.Assert;
/**
* Default implementation of the {@link org.springframework.data.repository.CrudRepository} interface. This will offer
* you a more sophisticated interface than the plain {@link EntityManager} .
*
* @author Oliver Gierke
* @author Eberhard Wolff
* @author Thomas Darimont
* @author Mark Paluch
* @author Christoph Strobl
* @author Stefan Fussenegger
* @author Jens Schauder
* @param the type of the entity to handle
* @param the type of the entity's identifier
*/
@Repository
@Transactional(readOnly = true)
public class SimpleJpaRepository implements JpaRepositoryImplementation {
private static final String ID_MUST_NOT_BE_NULL = "The given id must not be null!";
private final JpaEntityInformation entityInformation;
private final EntityManager em;
private final PersistenceProvider provider;
private @Nullable CrudMethodMetadata metadata;
/**
* Creates a new {@link SimpleJpaRepository} to manage objects of the given {@link JpaEntityInformation}.
*
* @param entityInformation must not be {@literal null}.
* @param entityManager must not be {@literal null}.
*/
public SimpleJpaRepository(JpaEntityInformation entityInformation, EntityManager entityManager) {
Assert.notNull(entityInformation, "JpaEntityInformation must not be null!");
Assert.notNull(entityManager, "EntityManager must not be null!");
this.entityInformation = entityInformation;
this.em = entityManager;
this.provider = PersistenceProvider.fromEntityManager(entityManager);
}
/**
* Creates a new {@link SimpleJpaRepository} to manage objects of the given domain type.
*
* @param domainClass must not be {@literal null}.
* @param em must not be {@literal null}.
*/
public SimpleJpaRepository(Class domainClass, EntityManager em) {
this(JpaEntityInformationSupport.getEntityInformation(domainClass, em), em);
}
/**
* Configures a custom {@link CrudMethodMetadata} to be used to detect {@link LockModeType}s and query hints to be
* applied to queries.
*
* @param crudMethodMetadata
*/
public void setRepositoryMethodMetadata(CrudMethodMetadata crudMethodMetadata) {
this.metadata = crudMethodMetadata;
}
@Nullable
protected CrudMethodMetadata getRepositoryMethodMetadata() {
return metadata;
}
protected Class getDomainClass() {
return entityInformation.getJavaType();
}
private String getDeleteAllQueryString() {
return getQueryString(DELETE_ALL_QUERY_STRING, entityInformation.getEntityName());
}
private String getCountQueryString() {
String countQuery = String.format(COUNT_QUERY_STRING, provider.getCountQueryPlaceholder(), "%s");
return getQueryString(countQuery, entityInformation.getEntityName());
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.CrudRepository#delete(java.io.Serializable)
*/
@Transactional
public void deleteById(ID id) {
Assert.notNull(id, ID_MUST_NOT_BE_NULL);
delete(findById(id).orElseThrow(() -> new EmptyResultDataAccessException(
String.format("No %s entity with id %s exists!", entityInformation.getJavaType(), id), 1)));
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.CrudRepository#delete(java.lang.Object)
*/
@Transactional
public void delete(T entity) {
Assert.notNull(entity, "The entity must not be null!");
em.remove(em.contains(entity) ? entity : em.merge(entity));
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.CrudRepository#delete(java.lang.Iterable)
*/
@Transactional
public void deleteAll(Iterable entities) {
Assert.notNull(entities, "The given Iterable of entities not be null!");
for (T entity : entities) {
delete(entity);
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaRepository#deleteInBatch(java.lang.Iterable)
*/
@Transactional
public void deleteInBatch(Iterable entities) {
Assert.notNull(entities, "The given Iterable of entities not be null!");
if (!entities.iterator().hasNext()) {
return;
}
applyAndBind(getQueryString(DELETE_ALL_QUERY_STRING, entityInformation.getEntityName()), entities, em)
.executeUpdate();
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.Repository#deleteAll()
*/
@Transactional
public void deleteAll() {
for (T element : findAll()) {
delete(element);
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaRepository#deleteAllInBatch()
*/
@Transactional
public void deleteAllInBatch() {
em.createQuery(getDeleteAllQueryString()).executeUpdate();
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.CrudRepository#findById(java.io.Serializable)
*/
public Optional findById(ID id) {
Assert.notNull(id, ID_MUST_NOT_BE_NULL);
Class domainType = getDomainClass();
if (metadata == null) {
return Optional.ofNullable(em.find(domainType, id));
}
LockModeType type = metadata.getLockModeType();
Map hints = getQueryHints().withFetchGraphs(em).asMap();
return Optional.ofNullable(type == null ? em.find(domainType, id, hints) : em.find(domainType, id, type, hints));
}
/**
* Returns {@link QueryHints} with the query hints based on the current {@link CrudMethodMetadata} and potential
* {@link EntityGraph} information.
*
* @return
*/
protected QueryHints getQueryHints() {
return metadata == null ? NoHints.INSTANCE : DefaultQueryHints.of(entityInformation, metadata);
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaRepository#getOne(java.io.Serializable)
*/
@Override
public T getOne(ID id) {
Assert.notNull(id, ID_MUST_NOT_BE_NULL);
return em.getReference(getDomainClass(), id);
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.CrudRepository#existsById(java.io.Serializable)
*/
public boolean existsById(ID id) {
Assert.notNull(id, ID_MUST_NOT_BE_NULL);
if (entityInformation.getIdAttribute() == null) {
return findById(id).isPresent();
}
String placeholder = provider.getCountQueryPlaceholder();
String entityName = entityInformation.getEntityName();
Iterable idAttributeNames = entityInformation.getIdAttributeNames();
String existsQuery = QueryUtils.getExistsQueryString(entityName, placeholder, idAttributeNames);
TypedQuery query = em.createQuery(existsQuery, Long.class);
if (!entityInformation.hasCompositeId()) {
query.setParameter(idAttributeNames.iterator().next(), id);
return query.getSingleResult() == 1L;
}
for (String idAttributeName : idAttributeNames) {
Object idAttributeValue = entityInformation.getCompositeIdAttributeValue(id, idAttributeName);
boolean complexIdParameterValueDiscovered = idAttributeValue != null
&& !query.getParameter(idAttributeName).getParameterType().isAssignableFrom(idAttributeValue.getClass());
if (complexIdParameterValueDiscovered) {
// fall-back to findById(id) which does the proper mapping for the parameter.
return findById(id).isPresent();
}
query.setParameter(idAttributeName, idAttributeValue);
}
return query.getSingleResult() == 1L;
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaRepository#findAll()
*/
public List findAll() {
return getQuery(null, Sort.unsorted()).getResultList();
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.CrudRepository#findAll(java.lang.Iterable)
*/
public List findAllById(Iterable ids) {
Assert.notNull(ids, "The given Iterable of Id's must not be null!");
if (!ids.iterator().hasNext()) {
return Collections.emptyList();
}
if (entityInformation.hasCompositeId()) {
List results = new ArrayList();
for (ID id : ids) {
findById(id).ifPresent(results::add);
}
return results;
}
ByIdsSpecification specification = new ByIdsSpecification(entityInformation);
TypedQuery query = getQuery(specification, Sort.unsorted());
return query.setParameter(specification.parameter, ids).getResultList();
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaRepository#findAll(org.springframework.data.domain.Sort)
*/
public List findAll(Sort sort) {
return getQuery(null, sort).getResultList();
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.PagingAndSortingRepository#findAll(org.springframework.data.domain.Pageable)
*/
public Page findAll(Pageable pageable) {
if (isUnpaged(pageable)) {
return new PageImpl(findAll());
}
return findAll((Specification) null, pageable);
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaSpecificationExecutor#findOne(org.springframework.data.jpa.domain.Specification)
*/
public Optional findOne(@Nullable Specification spec) {
try {
return Optional.of(getQuery(spec, Sort.unsorted()).getSingleResult());
} catch (NoResultException e) {
return Optional.empty();
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaSpecificationExecutor#findAll(org.springframework.data.jpa.domain.Specification)
*/
public List findAll(@Nullable Specification spec) {
return getQuery(spec, Sort.unsorted()).getResultList();
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaSpecificationExecutor#findAll(org.springframework.data.jpa.domain.Specification, org.springframework.data.domain.Pageable)
*/
public Page findAll(@Nullable Specification spec, Pageable pageable) {
TypedQuery query = getQuery(spec, pageable);
return isUnpaged(pageable) ? new PageImpl(query.getResultList())
: readPage(query, getDomainClass(), pageable, spec);
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaSpecificationExecutor#findAll(org.springframework.data.jpa.domain.Specification, org.springframework.data.domain.Sort)
*/
public List findAll(@Nullable Specification spec, Sort sort) {
return getQuery(spec, sort).getResultList();
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.QueryByExampleExecutor#findOne(org.springframework.data.domain.Example)
*/
@Override
public Optional findOne(Example example) {
try {
return Optional.of(
getQuery(new ExampleSpecification(example), example.getProbeType(), Sort.unsorted()).getSingleResult());
} catch (NoResultException e) {
return Optional.empty();
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.QueryByExampleExecutor#count(org.springframework.data.domain.Example)
*/
@Override
public long count(Example example) {
return executeCountQuery(getCountQuery(new ExampleSpecification(example), example.getProbeType()));
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.QueryByExampleExecutor#exists(org.springframework.data.domain.Example)
*/
@Override
public boolean exists(Example example) {
return !getQuery(new ExampleSpecification(example), example.getProbeType(), Sort.unsorted()).getResultList()
.isEmpty();
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.QueryByExampleExecutor#findAll(org.springframework.data.domain.Example)
*/
@Override
public List findAll(Example example) {
return getQuery(new ExampleSpecification(example), example.getProbeType(), Sort.unsorted()).getResultList();
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.QueryByExampleExecutor#findAll(org.springframework.data.domain.Example, org.springframework.data.domain.Sort)
*/
@Override
public List findAll(Example example, Sort sort) {
return getQuery(new ExampleSpecification(example), example.getProbeType(), sort).getResultList();
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.query.QueryByExampleExecutor#findAll(org.springframework.data.domain.Example, org.springframework.data.domain.Pageable)
*/
@Override
public Page findAll(Example example, Pageable pageable) {
ExampleSpecification spec = new ExampleSpecification<>(example);
Class probeType = example.getProbeType();
TypedQuery query = getQuery(new ExampleSpecification<>(example), probeType, pageable);
return isUnpaged(pageable) ? new PageImpl<>(query.getResultList()) : readPage(query, probeType, pageable, spec);
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.CrudRepository#count()
*/
public long count() {
return em.createQuery(getCountQueryString(), Long.class).getSingleResult();
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaSpecificationExecutor#count(org.springframework.data.jpa.domain.Specification)
*/
public long count(@Nullable Specification spec) {
return executeCountQuery(getCountQuery(spec, getDomainClass()));
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.CrudRepository#save(java.lang.Object)
*/
@Transactional
public S save(S entity) {
if (entityInformation.isNew(entity)) {
em.persist(entity);
return entity;
} else {
return em.merge(entity);
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaRepository#saveAndFlush(java.lang.Object)
*/
@Transactional
public S saveAndFlush(S entity) {
S result = save(entity);
flush();
return result;
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaRepository#save(java.lang.Iterable)
*/
@Transactional
public List saveAll(Iterable entities) {
Assert.notNull(entities, "The given Iterable of entities not be null!");
List result = new ArrayList();
for (S entity : entities) {
result.add(save(entity));
}
return result;
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaRepository#flush()
*/
@Transactional
public void flush() {
em.flush();
}
/**
* Reads the given {@link TypedQuery} into a {@link Page} applying the given {@link Pageable} and
* {@link Specification}.
*
* @param query must not be {@literal null}.
* @param spec can be {@literal null}.
* @param pageable must not be {@literal null}.
* @return
* @deprecated use {@link #readPage(TypedQuery, Class, Pageable, Specification)} instead
*/
@Deprecated
protected Page readPage(TypedQuery query, Pageable pageable, @Nullable Specification spec) {
return readPage(query, getDomainClass(), pageable, spec);
}
/**
* Reads the given {@link TypedQuery} into a {@link Page} applying the given {@link Pageable} and
* {@link Specification}.
*
* @param query must not be {@literal null}.
* @param domainClass must not be {@literal null}.
* @param spec can be {@literal null}.
* @param pageable can be {@literal null}.
* @return
*/
protected Page readPage(TypedQuery query, final Class domainClass, Pageable pageable,
@Nullable Specification spec) {
if (pageable.isPaged()) {
query.setFirstResult((int) pageable.getOffset());
query.setMaxResults(pageable.getPageSize());
}
return PageableExecutionUtils.getPage(query.getResultList(), pageable,
() -> executeCountQuery(getCountQuery(spec, domainClass)));
}
/**
* Creates a new {@link TypedQuery} from the given {@link Specification}.
*
* @param spec can be {@literal null}.
* @param pageable must not be {@literal null}.
* @return
*/
protected TypedQuery getQuery(@Nullable Specification spec, Pageable pageable) {
Sort sort = pageable.isPaged() ? pageable.getSort() : Sort.unsorted();
return getQuery(spec, getDomainClass(), sort);
}
/**
* Creates a new {@link TypedQuery} from the given {@link Specification}.
*
* @param spec can be {@literal null}.
* @param domainClass must not be {@literal null}.
* @param pageable must not be {@literal null}.
* @return
*/
protected TypedQuery getQuery(@Nullable Specification spec, Class domainClass,
Pageable pageable) {
Sort sort = pageable.isPaged() ? pageable.getSort() : Sort.unsorted();
return getQuery(spec, domainClass, sort);
}
/**
* Creates a {@link TypedQuery} for the given {@link Specification} and {@link Sort}.
*
* @param spec can be {@literal null}.
* @param sort must not be {@literal null}.
* @return
*/
protected TypedQuery getQuery(@Nullable Specification spec, Sort sort) {
return getQuery(spec, getDomainClass(), sort);
}
/**
* Creates a {@link TypedQuery} for the given {@link Specification} and {@link Sort}.
*
* @param spec can be {@literal null}.
* @param domainClass must not be {@literal null}.
* @param sort must not be {@literal null}.
* @return
*/
protected TypedQuery getQuery(@Nullable Specification spec, Class domainClass, Sort sort) {
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery query = builder.createQuery(domainClass);
Root root = applySpecificationToCriteria(spec, domainClass, query);
query.select(root);
if (sort.isSorted()) {
query.orderBy(toOrders(sort, root, builder));
}
return applyRepositoryMethodMetadata(em.createQuery(query));
}
/**
* Creates a new count query for the given {@link Specification}.
*
* @param spec can be {@literal null}.
* @return
* @deprecated override {@link #getCountQuery(Specification, Class)} instead
*/
@Deprecated
protected TypedQuery getCountQuery(@Nullable Specification spec) {
return getCountQuery(spec, getDomainClass());
}
/**
* Creates a new count query for the given {@link Specification}.
*
* @param spec can be {@literal null}.
* @param domainClass must not be {@literal null}.
* @return
*/
protected TypedQuery getCountQuery(@Nullable Specification spec, Class domainClass) {
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery query = builder.createQuery(Long.class);
Root root = applySpecificationToCriteria(spec, domainClass, query);
if (query.isDistinct()) {
query.select(builder.countDistinct(root));
} else {
query.select(builder.count(root));
}
// Remove all Orders the Specifications might have applied
query.orderBy(Collections. emptyList());
return em.createQuery(query);
}
/**
* Applies the given {@link Specification} to the given {@link CriteriaQuery}.
*
* @param spec can be {@literal null}.
* @param domainClass must not be {@literal null}.
* @param query must not be {@literal null}.
* @return
*/
private Root applySpecificationToCriteria(@Nullable Specification spec, Class domainClass,
CriteriaQuery query) {
Assert.notNull(domainClass, "Domain class must not be null!");
Assert.notNull(query, "CriteriaQuery must not be null!");
Root root = query.from(domainClass);
if (spec == null) {
return root;
}
CriteriaBuilder builder = em.getCriteriaBuilder();
Predicate predicate = spec.toPredicate(root, query, builder);
if (predicate != null) {
query.where(predicate);
}
return root;
}
private TypedQuery applyRepositoryMethodMetadata(TypedQuery query) {
if (metadata == null) {
return query;
}
LockModeType type = metadata.getLockModeType();
TypedQuery toReturn = type == null ? query : query.setLockMode(type);
applyQueryHints(toReturn);
return toReturn;
}
private void applyQueryHints(Query query) {
for (Entry hint : getQueryHints().withFetchGraphs(em)) {
query.setHint(hint.getKey(), hint.getValue());
}
}
/**
* Executes a count query and transparently sums up all values returned.
*
* @param query must not be {@literal null}.
* @return
*/
private static long executeCountQuery(TypedQuery query) {
Assert.notNull(query, "TypedQuery must not be null!");
List totals = query.getResultList();
long total = 0L;
for (Long element : totals) {
total += element == null ? 0 : element;
}
return total;
}
private static boolean isUnpaged(Pageable pageable) {
return pageable.isUnpaged();
}
/**
* Specification that gives access to the {@link Parameter} instance used to bind the ids for
* {@link SimpleJpaRepository#findAllById(Iterable)}. Workaround for OpenJPA not binding collections to in-clauses
* correctly when using by-name binding.
*
* @see OPENJPA-2018
* @author Oliver Gierke
*/
@SuppressWarnings("rawtypes")
private static final class ByIdsSpecification implements Specification {
private static final long serialVersionUID = 1L;
private final JpaEntityInformation entityInformation;
@Nullable ParameterExpression parameter;
ByIdsSpecification(JpaEntityInformation entityInformation) {
this.entityInformation = entityInformation;
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.domain.Specification#toPredicate(javax.persistence.criteria.Root, javax.persistence.criteria.CriteriaQuery, javax.persistence.criteria.CriteriaBuilder)
*/
public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder cb) {
Path path = root.get(entityInformation.getIdAttribute());
parameter = cb.parameter(Iterable.class);
return path.in(parameter);
}
}
/**
* {@link Specification} that gives access to the {@link Predicate} instance representing the values contained in the
* {@link Example}.
*
* @author Christoph Strobl
* @since 1.10
* @param
*/
private static class ExampleSpecification implements Specification {
private static final long serialVersionUID = 1L;
private final Example example;
/**
* Creates new {@link ExampleSpecification}.
*
* @param example
*/
ExampleSpecification(Example example) {
Assert.notNull(example, "Example must not be null!");
this.example = example;
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.domain.Specification#toPredicate(javax.persistence.criteria.Root, javax.persistence.criteria.CriteriaQuery, javax.persistence.criteria.CriteriaBuilder)
*/
@Override
public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder cb) {
return QueryByExamplePredicateBuilder.getPredicate(root, cb, example);
}
}
}