@Override
  public void setUserData(final ZyNodeData<?> data) {
    Preconditions.checkNotNull(data, "Error: Invalid node data");

    m_userData = data;
  }
Sets the user data associated with the realizer.

@param data The new user data object.
java/zylib/src/main/java/com/google/security/zynamics/zylib/yfileswrap/gui/zygraph/realizers/ZyNodeRealizer.java