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Spring Data module for JPA repositories.
/*
* Copyright 2013 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.query;
import javax.persistence.EntityManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.EvaluationContextProvider;
import org.springframework.data.repository.query.QueryMethod;
import org.springframework.data.repository.query.RepositoryQuery;
import org.springframework.expression.spel.standard.SpelExpressionParser;
/**
* Factory to create the appropriate {@link RepositoryQuery} for a {@link JpaQueryMethod}.
*
* @author Thomas Darimont
*/
enum JpaQueryFactory {
INSTANCE;
private static final SpelExpressionParser PARSER = new SpelExpressionParser();
private static final Logger LOG = LoggerFactory.getLogger(JpaQueryFactory.class);
/**
* Creates a {@link RepositoryQuery} from the given {@link QueryMethod} that is potentially annotated with
* {@link Query}.
*
* @param queryMethod must not be {@literal null}.
* @param em must not be {@literal null}.
* @param evaluationContextProvider
* @return the {@link RepositoryQuery} derived from the annotation or {@code null} if no annotation found.
*/
AbstractJpaQuery fromQueryAnnotation(JpaQueryMethod queryMethod, EntityManager em,
EvaluationContextProvider evaluationContextProvider) {
LOG.debug("Looking up query for method {}", queryMethod.getName());
return fromMethodWithQueryString(queryMethod, em, queryMethod.getAnnotatedQuery(), evaluationContextProvider);
}
/**
* Creates a {@link RepositoryQuery} from the given {@link String} query.
*
* @param method must not be {@literal null}.
* @param em must not be {@literal null}.
* @param queryString must not be {@literal null} or empty.
* @param evaluationContextProvider
* @return
*/
AbstractJpaQuery fromMethodWithQueryString(JpaQueryMethod method, EntityManager em, String queryString,
EvaluationContextProvider evaluationContextProvider) {
if (queryString == null) {
return null;
}
return method.isNativeQuery() ? new NativeJpaQuery(method, em, queryString, evaluationContextProvider, PARSER) : //
new SimpleJpaQuery(method, em, queryString, evaluationContextProvider, PARSER);
}
/**
* Creates a {@link StoredProcedureJpaQuery} from the given {@link JpaQueryMethod} query.
*
* @param method must not be {@literal null}.
* @param em must not be {@literal null}.
* @return
*/
public StoredProcedureJpaQuery fromProcedureAnnotation(JpaQueryMethod method, EntityManager em) {
if (!method.isProcedureQuery()) {
return null;
}
return new StoredProcedureJpaQuery(method, em);
}
}