public FaunusEdge addEdge(final Direction direction, final FaunusEdge edge) {
if (OUT.equals(direction)) {
List<Edge> edges = this.outEdges.get(edge.getLabel());
if (null == edges) {
edges = new ArrayList<Edge>();
this.outEdges.put(edge.getLabel(), edges);
}
edges.add(edge);
} else if (IN.equals(direction)) {
List<Edge> edges = this.inEdges.get(edge.getLabel());
if (null == edges) {
edges = new ArrayList<Edge>();
this.inEdges.put(edge.getLabel(), edges);
}
edges.add(edge);
} else throw ExceptionFactory.bothIsNotSupported();
return edge;
}
