src/edu/berkeley/fleet/loops/ShipPool.java

   1 package edu.berkeley.fleet.loops;
   2 import java.util.*;
   3 import edu.berkeley.fleet.api.*;
   4 import static edu.berkeley.fleet.util.BitManipulations.*;
   5
   6 /**
   7  *  A ShipPool keeps track of ships which have been "allocated" and
   8  *  are in use.  ShipPools may be arranged in a hierarchy; allocating
   9  *  a ship in one pool will allocate it in all ancestors.
  10  */
  11 public class ShipPool implements Iterable<Ship> {
  12
  13     public final Fleet fleet;
  14     public final ShipPool ancestor;
  15
  16     private HashSet<Ship> allocatedShips = new HashSet<Ship>();
  17
  18     public ShipPool(Fleet fleet) { this(fleet, null); }
  19     public ShipPool(ShipPool ancestor) { this(ancestor.fleet, ancestor); }
  20     public ShipPool(Fleet fleet, ShipPool ancestor) {
  21         this.fleet = fleet;
  22         this.ancestor = ancestor;
  23     }
  24
  25     public Iterator<Ship> iterator() { return allocatedShips.iterator(); }
  26
  27     public void allocateShip(Ship ship) {
  28         if (allocatedShips.contains(ship))
  29             throw new RuntimeException("already allocated!");
  30         allocatedShips.add(ship);
  31     }
  32
  33     /** allocate a ship */
  34     public Ship allocateShip(String type) {
  35         Ship ship = null;
  36         if (ancestor != null) {
  37             ship = ancestor.allocateShip(type);
  38         } else {
  39             for(int i=0; ; i++) {
  40                 ship = fleet.getShip(type, i);
  41                 if (ship==null)
  42                     throw new RuntimeException("no more ships of type " + type);
  43                 if (!allocatedShips.contains(ship)) break;
  44             }
  45         }
  46         allocatedShips.add(ship);
  47         return ship;
  48     }
  49
  50     /** release an allocated ship */
  51     public void releaseShip(Ship ship) {
  52         if (!allocatedShips.contains(ship))
  53             throw new RuntimeException("ship " + ship + " released but was not allocated");
  54         allocatedShips.remove(ship);
  55         if (ancestor != null) ancestor.releaseShip(ship);
  56     }
  57
  58     public void releaseAll() {
  59         HashSet<Ship> toRelease = new HashSet<Ship>();
  60         toRelease.addAll(allocatedShips);
  61         for (Ship ship : toRelease)
  62             releaseShip(ship);
  63     }
  64 }