Geographic information system - Software Development Case Studies in Java - page 403

public void addEntity(MapEntity entity) {
entityList.add(entity);
}
// gets the entity found in location posX,posY
public MapEntity getEntity( int posX, int posY) {
Iterator iterator # entityList.iterator();
while (iterator.hasNext()) {
MapEntity entity # (MapEntity) iterator.next();
if (entity.contains(posX, posY))
return entity;
}
return null ;
}
public void paint(Graphics2D g, Color color) { . . . }
// converts the list of entities in XML format
public String toXML(String entityType) {
StringBuffer stream # new StringBuffer();
stream.append("\n <LIST TYPE # " ! '"' !
entityType ! '"' ! ">");
Iterator iterator # entityList.iterator();
while (iterator.hasNext())
stream.append(((MapEntity) iterator.next()).toXML());
stream.append("\n </LIST>");
return stream.toString();
}
}
public class MapLayer {
// name of the layer; "xxx" when not initialized
private String name # "xxx";
private String colorName # ""; // colour of the entities
private Color color # null ;
private boolean visible # false ;
private MapEntitySet siteSet # new MapEntitySet();
private MapEntitySet linkSet # new MapEntitySet();
private MapEntitySet areaSet # new MapEntitySet();
// this constructor is invoked when a new layer is created
public MapLayer(String name, String colorName) {
this .name # name;
this .colorName # colorName;
}
// this constructor is used to load a layer from file
public MapLayer(String line, BufferedReader lineReader) {
// extracts the name of the layer
String docLine # line;
int indexInit # docLine.indexOf("NAME # ");
docLine # docLine.substring(indexInit ! 6);