package org.neo4j.util;
import java.util.Collection;
import java.util.HashSet;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
/**
* Deletes an entire graph, i.e. all connected nodes (and their connected nodes)
* from a start node (any start node in that graph). It is mostly used in
* some test cases.
*/
public class EntireGraphDeletor implements GraphDeletor
{
public void delete( Node startNode )
{
removeNodeAndThoseConnectedWith( new HashSet<Node>(),
new HashSet<Relationship>(), startNode );
}
private void removeNodeAndThoseConnectedWith( Collection<Node> deletedNodes,
Collection<Relationship> deletedRels, Node node )
{
for ( Relationship rel : node.getRelationships() )
{
Node sub = rel.getOtherNode( node );
if ( deletedRels.add( rel ) )
{
aboutToDeleteRelationship( rel );
rel.delete();
}
removeNodeAndThoseConnectedWith( deletedNodes, deletedRels, sub );
}
if ( deletedNodes.add( node ) )
{
aboutToDeleteNode( node );
node.delete();
}
}
protected void aboutToDeleteRelationship( Relationship relationship )
{
}
protected void aboutToDeleteNode( Node node )
{
}
}