public void addIncomingEdge(final EdgeType edge) {
    Preconditions.checkNotNull(edge, "Error: Edge argument can't be null");

    m_incomingEdges.add(edge);
  }
Adds an incoming edge to the node.

@param edge The new incoming edge.
java/zylib/src/main/java/com/google/security/zynamics/zylib/gui/zygraph/nodes/CViewNode.java