1using System;
 2using System.Collections.Generic;
 3using gorilla.commons.utility;
 4
 5namespace momoney.database.transactions
 6{
 7    public class IdentityMapProxy<Key, Value> : IIdentityMap<Key, Value> where Value : Identifiable<Guid>
 8    {
 9        readonly IIdentityMap<Key, Value> real_map;
10        readonly IChangeTracker<Value> change_tracker;
11
12        public IdentityMapProxy(IChangeTracker<Value> change_tracker, IIdentityMap<Key, Value> real_map)
13        {
14            this.change_tracker = change_tracker;
15            this.real_map = real_map;
16        }
17
18        public IEnumerable<Value> all()
19        {
20            return real_map.all();
21        }
22
23        public void add(Key key, Value value)
24        {
25            change_tracker.register(value);
26            real_map.add(key, value);
27        }
28
29        public void update_the_item_for(Key key, Value new_value)
30        {
31            real_map.update_the_item_for(key, new_value);
32        }
33
34        public bool contains_an_item_for(Key key)
35        {
36            return real_map.contains_an_item_for(key);
37        }
38
39        public Value item_that_belongs_to(Key key)
40        {
41            return real_map.item_that_belongs_to(key);
42        }
43
44        public void evict(Key key)
45        {
46            change_tracker.delete(real_map.item_that_belongs_to(key));
47            real_map.evict(key);
48        }
49    }
50}