/guava/guava/src/com/google/common/graph/StandardMutableNetwork.java
NetworkConnections<N, E> connectionsV = nodeConnections.remove( nodeV) ;
NetworkConnections<N, E> connectionsV = nodeConnections.get ( nodeV ) ;
checkArgument(!isSelfLoop, SELF_LOOPS_NOT_ALLOWED, nodeU); } if (connectionsU == null) { connectionsU = addNodeInternal(nodeU); } connectionsU.addOutEdge(edge, nodeV); <extra_id_0> if (connectionsV == null) { connectionsV = addNodeInternal(nodeV); } connectionsV.addInEdge(edge, nodeU, isSelfLoop); edgeToReferenceNode.put(edge, nodeU); return true;