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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
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* KIND, either express or implied. See the License for the
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package org.apache.cayenne.jpa.bridge;
import java.util.Collections;
import org.apache.cayenne.jpa.map.JpaQueryHint;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.query.Query;
import org.apache.cayenne.query.SelectQuery;
/**
* An indirect query that resolves to Cayenne SelectQuery using information from JPA query
* hints.
*
* @author Andrus Adamchik
*/
public class JpaSelectQuery extends JpaIndirectQuery {
/**
* Creates a SelectQuery using query hints.
*/
@Override
protected Query createReplacementQuery(EntityResolver resolver) {
SelectQuery query = new SelectQuery();
if (parentEntity != null) {
query.setRoot(parentEntity);
}
else {
throw new CayenneRuntimeException("No parent entity. Query name: "
+ getName());
}
// metadata hints
JpaQueryHint dataRowsHint = jpaQuery.getHint(QueryHints.DATA_ROWS_HINT);
if (dataRowsHint != null) {
query.setFetchingDataRows("true".equalsIgnoreCase(dataRowsHint.getValue()));
}
// other hints
JpaQueryHint qualifierHint = jpaQuery.getHint(QueryHints.QUALIFIER_HINT);
if (qualifierHint != null) {
query.setQualifier(Expression.fromString(qualifierHint.getValue()));
}
return query.queryWithParameters(parameters != null
? parameters
: Collections.EMPTY_MAP);
}
}