/guava/guava/src/com/google/common/graph/DirectedGraphConnections.java
Object previousValue = adjacentNodeValues.get( node, PRED) ;
Object previousValue = adjacentNodeValues.put ( node, PRED ) ;
} } return removedValue == null ? null : (V) removedValue; } @Override public void addPredecessor(N node, V unused) { <extra_id_0> boolean addedPredecessor; if (previousValue == null) { addedPredecessor = true; } else if (previousValue instanceof PredAndSucc) { adjacentNodeValues.put(node, previousValue); addedPredecessor = false;