/*
* 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.dialect.impl;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.hibernate.ogm.datastore.spi.AssociationSnapshot;
import org.hibernate.ogm.datastore.spi.Tuple;
import org.hibernate.ogm.grid.AssociationKey;
import org.hibernate.ogm.grid.RowKey;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.PropertyContainer;
import org.neo4j.graphdb.Relationship;
/**
* Represents the association snapshot as loaded by Neo4j.
*
* @author Davide D'Alto <davide@hibernate.org>
*/
public final class Neo4jAssociationSnapshot implements AssociationSnapshot {
private final Map<RowKey, Tuple> tuples = new HashMap<RowKey, Tuple>();
public Neo4jAssociationSnapshot(Node ownerNode, AssociationKey associationKey) {
for ( Relationship relationship : relationships( ownerNode, associationKey ) ) {
RowKey rowKey = convert( associationKey, relationship );
Tuple tuple = new Tuple( new Neo4jTupleSnapshot( relationship ) );
tuples.put( rowKey, tuple );
}
}
@Override
public Tuple get(RowKey rowKey) {
return tuples.get( rowKey );
}
@Override
public boolean containsKey(RowKey rowKey) {
return tuples.containsKey( rowKey );
}
@Override
public int size() {
return tuples.size();
}
@Override
public Set<RowKey> getRowKeys() {
return tuples.keySet();
}
private Iterable<Relationship> relationships(Node ownerNode, AssociationKey associationKey) {
return ownerNode.getRelationships( Direction.OUTGOING, CypherCRUD.relationshipType( associationKey ) );
}
private RowKey convert(AssociationKey associationKey, PropertyContainer container) {
String[] columnNames = associationKey.getRowKeyColumnNames();
Object[] values = new Object[columnNames.length];
for ( int i = 0; i < columnNames.length; i++ ) {
String columnName = columnNames[i];
if ( container.hasProperty( columnName ) ) {
values[i] = container.getProperty( columnName );
}
}
return new RowKey( associationKey.getTable(), columnNames, values );
}
}