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