ReactiveQuerydslMongoPredicateExecutor.java
/*
* Copyright 2019-present 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
*
* https://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.mongodb.repository.support;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;
import org.bson.Document;
import org.reactivestreams.Publisher;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.ScrollPosition;
import org.springframework.data.domain.Slice;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Window;
import org.springframework.data.mongodb.core.ReactiveMongoOperations;
import org.springframework.data.mongodb.core.query.BasicQuery;
import org.springframework.data.mongodb.repository.query.MongoEntityInformation;
import org.springframework.data.querydsl.EntityPathResolver;
import org.springframework.data.querydsl.QuerydslPredicateExecutor;
import org.springframework.data.querydsl.ReactiveQuerydslPredicateExecutor;
import org.springframework.data.querydsl.SimpleEntityPathResolver;
import org.springframework.data.repository.query.FluentQuery;
import org.springframework.util.Assert;
import com.querydsl.core.types.EntityPath;
import com.querydsl.core.types.OrderSpecifier;
import com.querydsl.core.types.Predicate;
/**
* MongoDB-specific {@link QuerydslPredicateExecutor} that allows execution {@link Predicate}s in various forms.
*
* @author Mark Paluch
* @author Christoph Strobl
* @since 2.2
*/
public class ReactiveQuerydslMongoPredicateExecutor<T> extends QuerydslPredicateExecutorSupport<T>
implements ReactiveQuerydslPredicateExecutor<T> {
private final ReactiveMongoOperations mongoOperations;
/**
* Creates a new {@link ReactiveQuerydslMongoPredicateExecutor} for the given {@link MongoEntityInformation} and
* {@link ReactiveMongoOperations}. Uses the {@link SimpleEntityPathResolver} to create an {@link EntityPath} for the
* given domain class.
*
* @param entityInformation must not be {@literal null}.
* @param mongoOperations must not be {@literal null}.
*/
public ReactiveQuerydslMongoPredicateExecutor(MongoEntityInformation<T, ?> entityInformation,
ReactiveMongoOperations mongoOperations) {
this(entityInformation, mongoOperations, SimpleEntityPathResolver.INSTANCE);
}
/**
* Creates a new {@link ReactiveQuerydslMongoPredicateExecutor} for the given {@link MongoEntityInformation},
* {@link ReactiveMongoOperations} and {@link EntityPathResolver}.
*
* @param entityInformation must not be {@literal null}.
* @param mongoOperations must not be {@literal null}.
* @param resolver must not be {@literal null}.
*/
public ReactiveQuerydslMongoPredicateExecutor(MongoEntityInformation<T, ?> entityInformation,
ReactiveMongoOperations mongoOperations, EntityPathResolver resolver) {
super(mongoOperations.getConverter(), pathBuilderFor(resolver.createPath(entityInformation.getJavaType())),
entityInformation);
this.mongoOperations = mongoOperations;
}
@Override
public Mono<T> findOne(Predicate predicate) {
Assert.notNull(predicate, "Predicate must not be null");
return createQueryFor(predicate).fetchOne();
}
@Override
public Flux<T> findAll(Predicate predicate) {
Assert.notNull(predicate, "Predicate must not be null");
return createQueryFor(predicate).fetch();
}
@Override
public Flux<T> findAll(Predicate predicate, OrderSpecifier<?>... orders) {
Assert.notNull(predicate, "Predicate must not be null");
Assert.notNull(orders, "Order specifiers must not be null");
return createQueryFor(predicate).orderBy(orders).fetch();
}
@Override
public Flux<T> findAll(Predicate predicate, Sort sort) {
Assert.notNull(predicate, "Predicate must not be null");
Assert.notNull(sort, "Sort must not be null");
return applySorting(createQueryFor(predicate), sort).fetch();
}
@Override
public Flux<T> findAll(OrderSpecifier<?>... orders) {
Assert.notNull(orders, "Order specifiers must not be null");
return createQuery().orderBy(orders).fetch();
}
@Override
public Mono<Long> count(Predicate predicate) {
Assert.notNull(predicate, "Predicate must not be null");
return createQueryFor(predicate).fetchCount();
}
@Override
public Mono<Boolean> exists(Predicate predicate) {
Assert.notNull(predicate, "Predicate must not be null");
return createQueryFor(predicate).fetchCount().map(it -> it != 0);
}
@Override
public <S extends T, R, P extends Publisher<R>> P findBy(Predicate predicate,
Function<FluentQuery.ReactiveFluentQuery<S>, P> queryFunction) {
Assert.notNull(predicate, "Predicate must not be null");
Assert.notNull(queryFunction, "Query function must not be null");
return queryFunction.apply(new ReactiveFluentQuerydsl<S>(predicate, (Class<S>) typeInformation().getJavaType()));
}
/**
* Creates a {@link ReactiveSpringDataMongodbQuery} for the given {@link Predicate}.
*
* @param predicate
* @return
*/
private ReactiveSpringDataMongodbQuery<T> createQueryFor(Predicate predicate) {
return createQuery().where(predicate);
}
/**
* Creates a {@link ReactiveSpringDataMongodbQuery}.
*
* @return
*/
private ReactiveSpringDataMongodbQuery<T> createQuery() {
Class<T> javaType = typeInformation().getJavaType();
return new ReactiveSpringDataMongodbQuery<>(mongoOperations, javaType, javaType,
mongoOperations.getCollectionName(javaType), it -> {});
}
/**
* Applies the given {@link Sort} to the given {@link ReactiveSpringDataMongodbQuery}.
*
* @param query
* @param sort
* @return
*/
private ReactiveSpringDataMongodbQuery<T> applySorting(ReactiveSpringDataMongodbQuery<T> query, Sort sort) {
toOrderSpecifiers(sort).forEach(query::orderBy);
return query;
}
/**
* {@link org.springframework.data.repository.query.FluentQuery.ReactiveFluentQuery} using Querydsl {@link Predicate}.
*
* @since 3.3
* @author Mark Paluch
*/
class ReactiveFluentQuerydsl<T> extends ReactiveFluentQuerySupport<Predicate, T> {
ReactiveFluentQuerydsl(Predicate predicate, Class<T> resultType) {
this(predicate, Sort.unsorted(), 0, resultType, Collections.emptyList());
}
ReactiveFluentQuerydsl(Predicate predicate, Sort sort, int limit, Class<T> resultType,
List<String> fieldsToInclude) {
super(predicate, sort, limit, resultType, fieldsToInclude);
}
@Override
protected <R> ReactiveFluentQuerydsl<R> create(Predicate predicate, Sort sort, int limit, Class<R> resultType,
List<String> fieldsToInclude) {
return new ReactiveFluentQuerydsl<>(predicate, sort, limit, resultType, fieldsToInclude);
}
@Override
public Mono<T> one() {
return createQuery().fetchOne();
}
@Override
public Mono<T> first() {
return createQuery().fetchFirst();
}
@Override
public Flux<T> all() {
return createQuery().fetch();
}
@Override
public Mono<Window<T>> scroll(ScrollPosition scrollPosition) {
return createQuery().scroll(scrollPosition);
}
@Override
public Mono<Page<T>> page(Pageable pageable) {
Assert.notNull(pageable, "Pageable must not be null");
return createQuery().fetchPage(pageable);
}
@Override
public Mono<Slice<T>> slice(Pageable pageable) {
Assert.notNull(pageable, "Pageable must not be null");
return createQuery().fetchSlice(pageable);
}
@Override
public Mono<Long> count() {
return createQuery().fetchCount();
}
@Override
public Mono<Boolean> exists() {
return count().map(it -> it > 0).defaultIfEmpty(false);
}
private ReactiveSpringDataMongodbQuery<T> createQuery() {
return new ReactiveSpringDataMongodbQuery<>(mongoOperations, typeInformation().getJavaType(), getResultType(),
mongoOperations.getCollectionName(typeInformation().getJavaType()), this::customize).where(getPredicate());
}
private void customize(BasicQuery query) {
List<String> fieldsToInclude = getFieldsToInclude();
if (!fieldsToInclude.isEmpty()) {
Document fields = new Document();
fieldsToInclude.forEach(field -> fields.put(field, 1));
query.setFieldsObject(fields);
}
if (getSort().isSorted()) {
query.with(getSort());
}
query.limit(getLimit());
}
}
}