/*
* Copyright 2011-2012 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.mongodb.repository.support;
import java.io.Serializable;
import java.util.List;
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.domain.Sort.Order;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.MongoTemplate;
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.SimpleEntityPathResolver;
import org.springframework.data.repository.core.EntityMetadata;
import org.springframework.util.Assert;
import com.mysema.query.mongodb.MongodbQuery;
import com.mysema.query.types.EntityPath;
import com.mysema.query.types.Expression;
import com.mysema.query.types.OrderSpecifier;
import com.mysema.query.types.Predicate;
import com.mysema.query.types.path.PathBuilder;
/**
* Special QueryDsl based repository implementation that allows execution {@link Predicate}s in various forms.
*
* @author Oliver Gierke
*/
public class QueryDslMongoRepository<T, ID extends Serializable> extends SimpleMongoRepository<T, ID> implements
QueryDslPredicateExecutor<T> {
private final PathBuilder<T> builder;
/**
* Creates a new {@link QueryDslMongoRepository} for the given {@link EntityMetadata} and {@link MongoTemplate}. Uses
* the {@link SimpleEntityPathResolver} to create an {@link EntityPath} for the given domain class.
*
* @param entityInformation
* @param template
*/
public QueryDslMongoRepository(MongoEntityInformation<T, ID> entityInformation, MongoOperations mongoOperations) {
this(entityInformation, mongoOperations, SimpleEntityPathResolver.INSTANCE);
}
/**
* Creates a new {@link QueryDslMongoRepository} for the given {@link MongoEntityInformation}, {@link MongoTemplate}
* and {@link EntityPathResolver}.
*
* @param entityInformation
* @param mongoOperations
* @param resolver
*/
public QueryDslMongoRepository(MongoEntityInformation<T, ID> entityInformation, MongoOperations mongoOperations,
EntityPathResolver resolver) {
super(entityInformation, mongoOperations);
Assert.notNull(resolver);
EntityPath<T> path = resolver.createPath(entityInformation.getJavaType());
this.builder = new PathBuilder<T>(path.getType(), path.getMetadata());
}
/*
* (non-Javadoc)
* @see org.springframework.data.querydsl.QueryDslPredicateExecutor#findOne(com.mysema.query.types.Predicate)
*/
public T findOne(Predicate predicate) {
return createQueryFor(predicate).uniqueResult();
}
/*
* (non-Javadoc)
* @see org.springframework.data.querydsl.QueryDslPredicateExecutor#findAll(com.mysema.query.types.Predicate)
*/
public List<T> findAll(Predicate predicate) {
return createQueryFor(predicate).list();
}
/*
* (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) {
return createQueryFor(predicate).orderBy(orders).list();
}
/*
* (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) {
MongodbQuery<T> countQuery = createQueryFor(predicate);
MongodbQuery<T> query = createQueryFor(predicate);
return new PageImpl<T>(applyPagination(query, pageable).list(), pageable, countQuery.count());
}
/*
* (non-Javadoc)
* @see org.springframework.data.querydsl.QueryDslPredicateExecutor#count(com.mysema.query.types.Predicate)
*/
public long count(Predicate predicate) {
return createQueryFor(predicate).count();
}
/**
* Creates a {@link MongodbQuery} for the given {@link Predicate}.
*
* @param predicate
* @return
*/
private MongodbQuery<T> createQueryFor(Predicate predicate) {
Class<T> domainType = getEntityInformation().getJavaType();
MongodbQuery<T> query = new SpringDataMongodbQuery<T>(getMongoOperations(), domainType);
return query.where(predicate);
}
/**
* Applies the given {@link Pageable} to the given {@link MongodbQuery}.
*
* @param query
* @param pageable
* @return
*/
private MongodbQuery<T> applyPagination(MongodbQuery<T> query, Pageable pageable) {
if (pageable == null) {
return query;
}
query = query.offset(pageable.getOffset()).limit(pageable.getPageSize());
return applySorting(query, pageable.getSort());
}
/**
* Applies the given {@link Sort} to the given {@link MongodbQuery}.
*
* @param query
* @param sort
* @return
*/
private MongodbQuery<T> applySorting(MongodbQuery<T> query, Sort sort) {
if (sort == null) {
return query;
}
for (Order order : sort) {
query.orderBy(toOrder(order));
}
return query;
}
/**
* Transforms a plain {@link Order} into a QueryDsl specific {@link OrderSpecifier}.
*
* @param order
* @return
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
private OrderSpecifier<?> toOrder(Order order) {
Expression<Object> property = builder.get(order.getProperty());
return new OrderSpecifier(order.isAscending() ? com.mysema.query.types.Order.ASC
: com.mysema.query.types.Order.DESC, property);
}
}