/*
* Copyright 2013, Mysema Ltd
*
* 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 com.mysema.query.jpa;
import java.io.Closeable;
import java.io.IOException;
import java.util.Iterator;
import javax.persistence.Query;
import org.eclipse.persistence.config.QueryHints;
import org.eclipse.persistence.config.ResultSetType;
import org.eclipse.persistence.jpa.JpaQuery;
import org.eclipse.persistence.queries.Cursor;
import com.mysema.commons.lang.CloseableIterator;
import com.mysema.commons.lang.IteratorAdapter;
import com.mysema.query.types.FactoryExpression;
/**
*
* @author tiwe
*
*/
public class EclipseLinkHandler implements QueryHandler {
@Override
public void addEntity(Query query, String alias, Class<?> type) {
// do nothing
}
@Override
public void addScalar(Query query, String alias, Class<?> type) {
// do nothing
}
@Override
public boolean createNativeQueryTyped() {
return true;
}
@Override
public <T> CloseableIterator<T> iterate(Query query, FactoryExpression<?> projection) {
Iterator<T> iterator = null;
Closeable closeable = null;
if (query instanceof JpaQuery) {
JpaQuery<T> elQuery = (JpaQuery<T>) query;
elQuery.setHint(QueryHints.RESULT_SET_TYPE, ResultSetType.ForwardOnly);
elQuery.setHint(QueryHints.SCROLLABLE_CURSOR, true);
final Cursor cursor = elQuery.getResultCursor();
closeable = new Closeable() {
@Override
public void close() throws IOException {
cursor.close();
}
};
iterator = cursor;
} else {
iterator = query.getResultList().iterator();
}
if (projection != null) {
return new TransformingIterator<T>(iterator, closeable, projection);
} else {
return new IteratorAdapter<T>(iterator, closeable);
}
}
@Override
public boolean transform(Query query, FactoryExpression<?> projection) {
return false;
}
@Override
public boolean wrapEntityProjections() {
return false;
}
}