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interface GridProvider {
    public int getGridWidth()
    public int getGridHeight()
    public Object getGridElement(int x, int y)
    public void addGridListener(GridListener gridListener)
    public void removeGridListener(GridListener gridListener)
}

interface GridListener {
    void gridChanged(GridProvider grid, int x, int y, int w, int h)
}

class DinRutenettklasse {
}

GridProvider <|-- DinRutenettklasse
DinRutenettklasse --> "*" GridListener: gridListeners

public interface GridProvider {
    
    /**
     * Gets the width (number of columns) of the grid
     * @return the width of the grid
     */
    public int getGridWidth();
    /**
     * Gets the height (number of rows) of the grid
     * @return the height of the grid
     */
    public int getGridHeight();
    /**
     * Gets the element at the specified x (column) and y (row) position 
     * @param x the x-coordinate of the element
     * @param y the y-coordinate of the element
     * @return the object at the specified position
     */
    public Object getGridElement(int x, int y);
    /**
     * Adds the listener, so it will be notified when the grid changes
     * @param gridListener the listener to add
     */
    public void addGridListener(GridListener gridListener);
    /**
     * Removes the listener, so it no longer will be notified when the grid changes
     * @param gridListener the listener to remove
     */
    public void removeGridListener(GridListener gridListener);
}

public interface GridListener {
    /**
     * Notifies the listener that the grid has changed. The changed region is a rectangle at x,y with dimensions w,h.
     * @param grid the grid that has changed
     * @param x the x coordinate of the changed rectangle
     * @param y the y coordinate of the changed rectangle
     * @param w the width of the changed rectangle
     * @param h the height of the changed rectangle
     */
    public void gridChanged(GridProvider grid, int x, int y, int w, int h);
}