public void addOutgoingEdge(final EdgeType edge){
  Preconditions.checkNotNull(edge,"Error: Edge argument can not be null");
  Preconditions.checkArgument(!m_outgoingEdges.contains(edge),"Error: Outgoing edge was added before");
  m_outgoingEdges.add(edge);
}

public void addOutgoingEdge ( final EdgeType edge ) { Preconditions . checkNotNull ( edge , "Error: Edge argument can not be null" ) ; Preconditions . checkArgument ( ! m_outgoingEdges . contains ( edge ) , "Error: Outgoing edge was added before" ) ; m_outgoingEdges . add ( edge ) ; }
adds an outgoing edge to the node .
