org.springframework.data.jpa.repository.support.QuerydslRepositorySupport Maven / Gradle / Ivy
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Spring Data module for JPA repositories.
/*
* Copyright 2011-2019 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 javax.annotation.Nullable;
import javax.annotation.PostConstruct;
import javax.persistence.EntityManager;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.util.Assert;
import com.querydsl.core.dml.DeleteClause;
import com.querydsl.core.dml.UpdateClause;
import com.querydsl.core.types.EntityPath;
import com.querydsl.core.types.dsl.PathBuilder;
import com.querydsl.core.types.dsl.PathBuilderFactory;
import com.querydsl.jpa.JPQLQuery;
import com.querydsl.jpa.impl.JPADeleteClause;
import com.querydsl.jpa.impl.JPAUpdateClause;
/**
* Base class for implementing repositories using Querydsl library.
*
* @author Oliver Gierke
* @author Mark Paluch
*/
@Repository
public abstract class QuerydslRepositorySupport {
private final PathBuilder builder;
private @Nullable EntityManager entityManager;
private @Nullable Querydsl querydsl;
/**
* Creates a new {@link QuerydslRepositorySupport} instance for the given domain type.
*
* @param domainClass must not be {@literal null}.
*/
public QuerydslRepositorySupport(Class domainClass) {
Assert.notNull(domainClass, "Domain class must not be null!");
this.builder = new PathBuilderFactory().create(domainClass);
}
/**
* Setter to inject {@link EntityManager}.
*
* @param entityManager must not be {@literal null}.
*/
@Autowired
public void setEntityManager(EntityManager entityManager) {
Assert.notNull(entityManager, "EntityManager must not be null!");
this.querydsl = new Querydsl(entityManager, builder);
this.entityManager = entityManager;
}
/**
* Callback to verify configuration. Used by containers.
*/
@PostConstruct
public void validate() {
Assert.notNull(entityManager, "EntityManager must not be null!");
Assert.notNull(querydsl, "Querydsl must not be null!");
}
/**
* Returns the {@link EntityManager}.
*
* @return the entityManager
*/
@Nullable
protected EntityManager getEntityManager() {
return entityManager;
}
/**
* Returns a fresh {@link JPQLQuery}.
*
* @param paths must not be {@literal null}.
* @return the Querydsl {@link JPQLQuery}.
*/
protected JPQLQuery