@Override
public Vertex getThat(Graph traversalContext) {
Edge incidentEdge;
try {
incidentEdge =
localGraphDatabase.getEdgeObject(storingGraphDatabase.getEdgeIdAtIncidenceId(id));
} catch (RemoteException e) {
throw new RuntimeException(e);
}
if (!incidentEdge.isBinary()) {
throw new UnsupportedOperationException("This method is only supported by binary Edges.");
}
Vertex vertex = null;
if (getDirection() == Direction.VERTEX_TO_EDGE) {
vertex = ((BinaryEdge) incidentEdge).getOmega();
} else {
vertex = ((BinaryEdge) incidentEdge).getAlpha();
}
if (getGraph().getTraversalContext() == null
|| getGraph().getTraversalContext().containsVertex(vertex)) {
return vertex;
} else {
return null;
}
}
@Override
public Edge getEdge() {
try {
return localGraphDatabase.getEdgeObject(storingGraphDatabase.getEdgeIdAtIncidenceId(id));
} catch (RemoteException e) {
throw new RuntimeException(e);
}
}
@Override
public Iterable<Vertex> getThoseVertices(Graph traversalContext) {
Edge edge;
try {
edge = localGraphDatabase.getEdgeObject(storingGraphDatabase.getEdgeIdAtIncidenceId(id));
} catch (RemoteException e) {
throw new RuntimeException(e);
}
assert getGraph().getTraversalContext() == null
|| getGraph().getTraversalContext().containsEdge(edge);
return edge.getIncidentVertices(traversalContext, getDirection().getOppositeDirection());
}
@Override
public Incidence getPreviousIncidenceAtEdge(Graph traversalContext) {
Incidence currentIncidence;
try {
currentIncidence =
localGraphDatabase.getIncidenceObject(
storingGraphDatabase.getPreviousIncidenceIdAtEdgeId(
storingGraphDatabase.getEdgeIdAtIncidenceId(id)));
} catch (RemoteException e) {
throw new RuntimeException(e);
}
while ((traversalContext != null)
&& (currentIncidence != null)
&& (!traversalContext.containsVertex(currentIncidence.getVertex()))) {
currentIncidence = currentIncidence.getPreviousIncidenceAtEdge();
}
return currentIncidence;
}
@Override
public Vertex getThis(Graph traversalContext) {
try {
if (!localGraphDatabase
.getEdgeObject(storingGraphDatabase.getEdgeIdAtIncidenceId(id))
.isBinary()) {
throw new UnsupportedOperationException("This method is only supported by binary Edges.");
} else {
Vertex vertex =
localGraphDatabase.getVertexObject(storingGraphDatabase.getVertexIdAtIncidenceId(id));
if (getGraph().getTraversalContext() == null
|| getGraph().getTraversalContext().containsVertex(vertex)) {
return vertex;
} else {
return null;
}
}
} catch (RemoteException e) {
throw new RuntimeException(e);
}
}