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