/*
* Copyright 2008-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.jpa.repository.support;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;
import java.util.Map.Entry;
import javax.persistence.EntityGraph;
import javax.persistence.EntityManager;
import javax.persistence.LockModeType;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.query.JpaEntityGraph;
import org.springframework.data.jpa.util.Jpa21Utils;
import org.springframework.data.querydsl.EntityPathResolver;
import org.springframework.data.querydsl.QSort;
import org.springframework.data.querydsl.QueryDslPredicateExecutor;
import org.springframework.data.querydsl.SimpleEntityPathResolver;
import com.mysema.query.jpa.JPQLQuery;
import com.mysema.query.jpa.impl.JPAQuery;
import com.mysema.query.types.EntityPath;
import com.mysema.query.types.OrderSpecifier;
import com.mysema.query.types.Predicate;
import com.mysema.query.types.path.PathBuilder;
/**
* QueryDsl specific extension of {@link SimpleJpaRepository} which adds implementation for
* {@link QueryDslPredicateExecutor}.
*
* @author Oliver Gierke
*/
public class QueryDslJpaRepository<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements
QueryDslPredicateExecutor<T> {
private static final EntityPathResolver DEFAULT_ENTITY_PATH_RESOLVER = SimpleEntityPathResolver.INSTANCE;
private final EntityPath<T> path;
private final PathBuilder<T> builder;
private final Querydsl querydsl;
private final EntityManager em;
/**
* Creates a new {@link QueryDslJpaRepository} from the given domain class and {@link EntityManager}. This will use
* the {@link SimpleEntityPathResolver} to translate the given domain class into an {@link EntityPath}.
*
* @param entityInformation must not be {@literal null}.
* @param entityManager must not be {@literal null}.
*/
public QueryDslJpaRepository(JpaEntityInformation<T, ID> entityInformation, EntityManager entityManager) {
this(entityInformation, entityManager, DEFAULT_ENTITY_PATH_RESOLVER);
}
/**
* Creates a new {@link QueryDslJpaRepository} from the given domain class and {@link EntityManager} and uses the
* given {@link EntityPathResolver} to translate the domain class into an {@link EntityPath}.
*
* @param entityInformation must not be {@literal null}.
* @param entityManager must not be {@literal null}.
* @param resolver must not be {@literal null}.
*/
public QueryDslJpaRepository(JpaEntityInformation<T, ID> entityInformation, EntityManager entityManager,
EntityPathResolver resolver) {
super(entityInformation, entityManager);
this.em = entityManager;
this.path = resolver.createPath(entityInformation.getJavaType());
this.builder = new PathBuilder<T>(path.getType(), path.getMetadata());
this.querydsl = new Querydsl(entityManager, builder);
}
/*
* (non-Javadoc)
* @see org.springframework.data.querydsl.QueryDslPredicateExecutor#findOne(com.mysema.query.types.Predicate)
*/
public T findOne(Predicate predicate) {
return createQuery(predicate).uniqueResult(path);
}
/*
* (non-Javadoc)
* @see org.springframework.data.querydsl.QueryDslPredicateExecutor#findAll(com.mysema.query.types.Predicate)
*/
public List<T> findAll(Predicate predicate) {
return createQuery(predicate).list(path);
}
/*
* (non-Javadoc)
* @see org.springframework.data.querydsl.QueryDslPredicateExecutor#findAll(com.mysema.query.types.Predicate, com.mysema.query.types.OrderSpecifier<?>[])
*/
public List<T> findAll(Predicate predicate, OrderSpecifier<?>... orders) {
JPQLQuery query = createQuery(predicate);
query = querydsl.applySorting(new QSort(orders), query);
return query.list(path);
}
/*
* (non-Javadoc)
* @see org.springframework.data.querydsl.QueryDslPredicateExecutor#findAll(com.mysema.query.types.Predicate, org.springframework.data.domain.Pageable)
*/
public Page<T> findAll(Predicate predicate, Pageable pageable) {
JPQLQuery countQuery = createQuery(predicate);
JPQLQuery query = querydsl.applyPagination(pageable, createQuery(predicate));
Long total = countQuery.count();
List<T> content = total > pageable.getOffset() ? query.list(path) : Collections.<T> emptyList();
return new PageImpl<T>(content, pageable, total);
}
/*
* (non-Javadoc)
* @see org.springframework.data.querydsl.QueryDslPredicateExecutor#count(com.mysema.query.types.Predicate)
*/
public long count(Predicate predicate) {
return createQuery(predicate).count();
}
/**
* Creates a new {@link JPQLQuery} for the given {@link Predicate}.
*
* @param predicate
* @return the Querydsl {@link JPQLQuery}.
*/
protected JPQLQuery createQuery(Predicate... predicate) {
JPAQuery query = querydsl.createQuery(path).where(predicate);
CrudMethodMetadata metadata = getRepositoryMethodMetadata();
if (metadata == null) {
return query;
}
LockModeType type = metadata.getLockModeType();
query = type == null ? query : query.setLockMode(type);
for (Entry<String, Object> hint : metadata.getQueryHints().entrySet()) {
query.setHint(hint.getKey(), hint.getValue());
}
JpaEntityGraph jpaEntityGraph = metadata.getEntityGraph();
if (jpaEntityGraph == null) {
return query;
}
EntityGraph<?> entityGraph = Jpa21Utils.tryGetFetchGraph(em, jpaEntityGraph);
if (entityGraph == null) {
return query;
}
query.setHint(jpaEntityGraph.getType().getKey(), entityGraph);
return query;
}
}