public void addAsPlaceHolder(String varName) {
        placeHolderVarNames.add(varName);
        if (getVariable(varName) != null && getVariable(varName).getShape() != null) {
            placeHolderOriginalShapes.put(varName, getVariable(varName).getShape());
        }
    }
public void addAsPlaceHolder(String varName) {
        placeHolderVarNames.add(varName);
        if (getVariable(varName) != null && getVariable(varName).getShape() != null) {
            placeHolderOriginalShapes.put(varName, getVariable(varName).getShape());
        }
    }
public void addAsPlaceHolder ( String varName ) { placeHolderVarNames . add ( varName ) ; if ( getVariable ( varName ) != null && getVariable ( varName ) . getShape ( ) != null ) { placeHolderOriginalShapes . put ( varName , getVariable ( varName ) . getShape ( ) ) ; } }
Add  this vertex id as a place holder

@param varName the vertex id to add
Add this vertex id as a place holder