/*
* Copyright 2011-2017 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 org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.mapping.MongoPersistentEntity;
import org.springframework.util.Assert;
import com.querydsl.core.types.EntityPath;
import com.querydsl.mongodb.AbstractMongodbQuery;
/**
* Base class to create repository implementations based on Querydsl.
*
* @author Oliver Gierke
* @author Mark Paluch
*/
public abstract class QuerydslRepositorySupport {
private final MongoOperations template;
private final MappingContext<? extends MongoPersistentEntity<?>, ?> context;
/**
* Creates a new {@link QuerydslRepositorySupport} for the given {@link MongoOperations}.
*
* @param operations must not be {@literal null}.
*/
public QuerydslRepositorySupport(MongoOperations operations) {
Assert.notNull(operations, "MongoOperations must not be null!");
this.template = operations;
this.context = operations.getConverter().getMappingContext();
}
/**
* Returns a {@link MongodbQuery} for the given {@link EntityPath}. The collection being queried is derived from the
* entity metadata.
*
* @param path
* @return
*/
protected <T> AbstractMongodbQuery<T, SpringDataMongodbQuery<T>> from(final EntityPath<T> path) {
Assert.notNull(path, "EntityPath must not be null!");
MongoPersistentEntity<?> entity = context.getRequiredPersistentEntity(path.getType());
return from(path, entity.getCollection());
}
/**
* Returns a {@link MongodbQuery} for the given {@link EntityPath} querying the given collection.
*
* @param path must not be {@literal null}
* @param collection must not be blank or {@literal null}
* @return
*/
protected <T> AbstractMongodbQuery<T, SpringDataMongodbQuery<T>> from(final EntityPath<T> path, String collection) {
Assert.notNull(path, "EntityPath must not be null!");
Assert.hasText(collection, "Collection name must not be null or empty!");
return new SpringDataMongodbQuery<T>(template, path.getType(), collection);
}
}