/**
* Copyright 2011 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.neo4j.repository.query;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.neo4j.support.Neo4jTemplate;
import org.springframework.data.neo4j.support.mapping.Neo4jMappingContext;
import org.springframework.data.repository.core.EntityMetadata;
import org.springframework.data.repository.query.Parameter;
import org.springframework.data.repository.query.ParameterAccessor;
import org.springframework.data.repository.query.RepositoryQuery;
import org.springframework.data.repository.query.parser.PartTree;
import org.springframework.util.Assert;
import java.util.Map;
/**
* {@link RepositoryQuery} implementation that derives a Cypher query from the {@link GraphQueryMethod}'s method name.
*
* @author Oliver Gierke
*/
public class DerivedCypherRepositoryQuery extends CypherGraphRepositoryQuery {
public static final Logger log = LoggerFactory.getLogger(DerivedCypherRepositoryQuery.class);
private final CypherQueryDefinition query;
/**
* Creates a new {@link DerivedCypherRepositoryQuery} from the given {@link MappingContext},
* {@link GraphQueryMethod} and {@link org.springframework.data.neo4j.support.Neo4jTemplate}.
*
* @param mappingContext must not be {@literal null}.
* @param queryMethod must not be {@literal null}.
* @param template must not be {@literal null}.
*/
public DerivedCypherRepositoryQuery(Neo4jMappingContext mappingContext, GraphQueryMethod queryMethod, Neo4jTemplate template) {
super(queryMethod, template);
Assert.notNull(mappingContext);
EntityMetadata<?> info = queryMethod.getEntityInformation();
PartTree tree = new PartTree(queryMethod.getName(), info.getJavaType());
this.query = new CypherQueryCreator(tree, mappingContext, info.getJavaType(),template).createQuery();
if (log.isDebugEnabled()) log.debug("Derived query: "+query+ "from method "+queryMethod);
}
@Override
public Map<Parameter, Object> resolveParameters(Map<Parameter, Object> parameters) {
return super.resolveParameters(query.resolveParameters(parameters));
}
/**
* Returns the actual Cypher query applying {@link Pageable} or {@link Sort} instances.
*
* @param accessor parameters
* @return query string
*/
protected String createQueryWithPagingAndSorting(ParameterAccessor accessor) {
if (accessor.getPageable() != null) {
return query.toQueryString(accessor.getPageable());
} else if (accessor.getSort() != null) {
return query.toQueryString(accessor.getSort());
} else {
return query.toQueryString();
}
}
}