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RelationshipConversion.java
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RelationshipConversion.java
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/*
* Copyright (c) 2002-2018 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.core;
import org.apache.commons.lang3.ArrayUtils;
import java.util.NoSuchElementException;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.internal.kernel.api.RelationshipTraversalCursor;
public class RelationshipConversion implements ResourceIterator<Relationship>
{
private final EmbeddedProxySPI actions;
private final RelationshipTraversalCursor cursor;
private final Direction direction;
private final int[] typeIds;
private Relationship next;
private boolean closed;
public RelationshipConversion(
EmbeddedProxySPI actions,
RelationshipTraversalCursor cursor,
Direction direction,
int[] typeIds)
{
this.actions = actions;
this.cursor = cursor;
this.direction = direction;
this.typeIds = typeIds;
}
@Override
public boolean hasNext()
{
if ( next == null && !closed )
{
while ( cursor.next() )
{
if ( correctDirection() && correctType() )
{
next = actions.newRelationshipProxy(
cursor.relationshipReference(),
cursor.sourceNodeReference(),
cursor.label(),
cursor.targetNodeReference() );
return true;
}
}
close();
}
return next != null;
}
private boolean correctDirection()
{
return direction == Direction.BOTH ||
(direction == Direction.OUTGOING && cursor.originNodeReference() == cursor.sourceNodeReference()) ||
(direction == Direction.INCOMING && cursor.originNodeReference() == cursor.targetNodeReference());
}
private boolean correctType()
{
return typeIds == null || ArrayUtils.contains( typeIds, cursor.label() );
}
@Override
public Relationship next()
{
if ( !hasNext() )
{
throw new NoSuchElementException();
}
Relationship current = next;
next = null;
return current;
}
@Override
public void remove()
{
throw new UnsupportedOperationException();
}
@Override
public void close()
{
if ( !closed )
{
cursor.close();
closed = true;
}
}
}