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Spring Data module for JPA repositories.
/*
* Copyright 2008-2013 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 javax.persistence.Query;
import org.springframework.data.repository.query.EvaluationContextProvider;
import org.springframework.data.repository.query.RepositoryQuery;
import org.springframework.expression.spel.standard.SpelExpressionParser;
/**
* {@link RepositoryQuery} implementation that inspects a {@link org.springframework.data.repository.query.QueryMethod}
* for the existence of an {@link org.springframework.data.jpa.repository.Query} annotation and creates a JPA
* {@link Query} from it.
*
* @author Oliver Gierke
* @author Thomas Darimont
*/
final class SimpleJpaQuery extends AbstractStringBasedJpaQuery {
/**
* Creates a new {@link SimpleJpaQuery} encapsulating the query annotated on the given {@link JpaQueryMethod}.
*
* @param method must not be {@literal null}
* @param em must not be {@literal null}
* @param evaluationContextProvider must not be {@literal null}
* @param parser must not be {@literal null}
*/
public SimpleJpaQuery(JpaQueryMethod method, EntityManager em, EvaluationContextProvider evaluationContextProvider,
SpelExpressionParser parser) {
this(method, em, method.getAnnotatedQuery(), evaluationContextProvider, parser);
}
/**
* Creates a new {@link SimpleJpaQuery} that encapsulates a simple query string.
*
* @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 must not be {@literal null}
* @param parser must not be {@literal null}
*/
public SimpleJpaQuery(JpaQueryMethod method, EntityManager em, String queryString,
EvaluationContextProvider evaluationContextProvider, SpelExpressionParser parser) {
super(method, em, queryString, evaluationContextProvider, parser);
validateQuery(getQuery().getQueryString(), String.format("Validation failed for query for method %s!", method));
if (method.isPageQuery()) {
validateQuery(getCountQuery().getQueryString(),
String.format("Count query validation failed for method %s!", method));
}
}
/**
* Validates the given query for syntactical correctness.
*
* @param query
* @param em
*/
private final void validateQuery(String query, String errorMessage) {
if (getQueryMethod().isProcedureQuery()) {
return;
}
EntityManager validatingEm = null;
try {
validatingEm = getEntityManager().getEntityManagerFactory().createEntityManager();
validatingEm.createQuery(query);
} catch (RuntimeException e) {
// Needed as there's ambiguities in how an invalid query string shall be expressed by the persistence provider
// http://java.net/projects/jpa-spec/lists/jsr338-experts/archive/2012-07/message/17
throw new IllegalArgumentException(errorMessage, e);
} finally {
if (validatingEm != null) {
validatingEm.close();
}
}
}
}