How to use

getReference

method

in

com.google.common.graph.UndirectedMultiNetworkConnections

private Multiset<N> adjacentNodesMultiset() {
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes == null) {
  adjacentNodes = HashMultiset.create(incidentEdgeMap.values());
  adjacentNodesReference = new SoftReference<>(adjacentNodes);
 }
 return adjacentNodes;
}

@Override
public void addOutEdge(E edge, N node) {
 super.addOutEdge(edge, node);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.add(node));
 }
}

private Multiset<N> adjacentNodesMultiset() {
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes == null) {
  adjacentNodes = HashMultiset.create(incidentEdgeMap.values());
  adjacentNodesReference = new SoftReference<>(adjacentNodes);
 }
 return adjacentNodes;
}

@Override
public N removeOutEdge(E edge) {
 N node = super.removeOutEdge(edge);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.remove(node));
 }
 return node;
}

private Multiset<N> adjacentNodesMultiset() {
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes == null) {
  adjacentNodes = HashMultiset.create(incidentEdgeMap.values());
  adjacentNodesReference = new SoftReference<>(adjacentNodes);
 }
 return adjacentNodes;
}

@Override
public void addOutEdge(E edge, N node) {
 super.addOutEdge(edge, node);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.add(node));
 }
}

@Override
public void addOutEdge(E edge, N node) {
 super.addOutEdge(edge, node);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.add(node));
 }
}

@Override
public N removeOutEdge(E edge) {
 N node = super.removeOutEdge(edge);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.remove(node));
 }
 return node;
}

@Override
public N removeOutEdge(E edge) {
 N node = super.removeOutEdge(edge);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.remove(node));
 }
 return node;
}

private Multiset<N> adjacentNodesMultiset() {
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes == null) {
  adjacentNodes = HashMultiset.create(incidentEdgeMap.values());
  adjacentNodesReference = new SoftReference<>(adjacentNodes);
 }
 return adjacentNodes;
}

private Multiset<N> adjacentNodesMultiset() {
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes == null) {
  adjacentNodes = HashMultiset.create(incidentEdgeMap.values());
  adjacentNodesReference = new SoftReference<>(adjacentNodes);
 }
 return adjacentNodes;
}

@Override
public void addOutEdge(E edge, N node) {
 super.addOutEdge(edge, node);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.add(node));
 }
}

@Override
public void addOutEdge(E edge, N node) {
 super.addOutEdge(edge, node);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.add(node));
 }
}

@Override
public N removeOutEdge(E edge) {
 N node = super.removeOutEdge(edge);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.remove(node));
 }
 return node;
}

@Override
public N removeOutEdge(E edge) {
 N node = super.removeOutEdge(edge);
 Multiset<N> adjacentNodes = getReference(adjacentNodesReference);
 if (adjacentNodes != null) {
  checkState(adjacentNodes.remove(node));
 }
 return node;
}