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BoltNeo4jNodesTupleIterator.java
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BoltNeo4jNodesTupleIterator.java
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/*
* Hibernate OGM, Domain model persistence for NoSQL datastores
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.ogm.datastore.neo4j.remote.bolt.dialect.impl;
import java.util.Map;
import org.hibernate.ogm.dialect.query.spi.ClosableIterator;
import org.hibernate.ogm.dialect.spi.TupleTypeContext;
import org.hibernate.ogm.model.key.spi.EntityKeyMetadata;
import org.hibernate.ogm.model.spi.Tuple;
import org.hibernate.ogm.model.spi.Tuple.SnapshotType;
import org.neo4j.driver.v1.Transaction;
import org.neo4j.driver.v1.types.Node;
/**
* Iterates over the result of a native query when each result is a neo4j node. This is the case when the result of
* native query is mapped by an entity type.
*
* @author Davide D'Alto
*/
public class BoltNeo4jNodesTupleIterator implements ClosableIterator<Tuple> {
private final EntityKeyMetadata entityKeyMetadata;
private final BoltNeo4jEntityQueries entityQueries;
private final TupleTypeContext tupleTypeContext;
private final ClosableIterator<NodeWithEmbeddedNodes> entities;
private final Transaction tx;
private final boolean closeTransaction;
public BoltNeo4jNodesTupleIterator(
Transaction tx,
BoltNeo4jEntityQueries entityQueries,
EntityKeyMetadata entityKeyMetadata,
TupleTypeContext tupleTypeContext,
ClosableIterator<NodeWithEmbeddedNodes> entities) {
this( tx, entityQueries, entityKeyMetadata, tupleTypeContext, entities, false );
}
public BoltNeo4jNodesTupleIterator(
Transaction tx,
BoltNeo4jEntityQueries entityQueries,
EntityKeyMetadata entityKeyMetadata,
TupleTypeContext tupleTypeContext,
ClosableIterator<NodeWithEmbeddedNodes> entities,
boolean closeTransaction) {
this.tx = tx;
this.entityQueries = entityQueries;
this.entityKeyMetadata = entityKeyMetadata;
this.tupleTypeContext = tupleTypeContext;
this.entities = entities;
this.closeTransaction = closeTransaction;
}
private Tuple createTuple(NodeWithEmbeddedNodes node) {
Map<String, Node> toOneEntities = BoltNeo4jAssociatedNodesHelper.findAssociatedNodes( tx, node, entityKeyMetadata, tupleTypeContext, entityQueries );
return new Tuple( new BoltNeo4jTupleSnapshot( node, entityKeyMetadata, toOneEntities, tupleTypeContext ), SnapshotType.UPDATE );
}
@Override
public boolean hasNext() {
return entities.hasNext();
}
@Override
public Tuple next() {
NodeWithEmbeddedNodes node = entities.next();
return createTuple( node );
}
@Override
public void remove() {
entities.remove();
}
@Override
public void close() {
try {
entities.close();
if ( closeTransaction ) {
tx.success();
}
}
finally {
if ( closeTransaction ) {
tx.close();
}
}
}
}