public String getDescription() {return cps;}
public List<INode> getChildNodes() {return null;}
public List<INode> getAdjacentNodes() {return null;}
public void appendState(String arg0) {cps += arg0;}
public void addParentNode(INode arg0) throws InvalidParentException {throw new InvalidParentException(cps);}
public void addChildNode(INode arg0) throws InvalidParentException {throw new InvalidParentException(cps);}