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comparison Agendas/trunk/src/Agendas.NHibernate/GenericWellKnownInstanceType.cs @ 140:3639803112c6

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Refactoring de la relación entre Evento y Estado
author nelopauselli
date Fri, 29 Jul 2011 16:30:53 -0300
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139:18e5a78186e4 140:3639803112c6
1 using System;
2 using System.Collections.Generic;
3 using System.Data;
4 using System.Linq;
5 using NHibernate.SqlTypes;
6 using NHibernate.UserTypes;
7
8 namespace Agendas.NHibernate
9 {
10 [Serializable]
11 public abstract class GenericWellKnownInstanceType<T, TId> : IUserType where T : class
12 {
13 //private static readonly SqlType[] ReturnSqlTypes = { SqlTypeFactory.Int32 };
14 private Func<T, TId, bool> findPredicate;
15 private Func<T, TId> idGetter;
16 private IEnumerable<T> repository;
17
18 /// <summary>
19 /// Base constructor
20 /// </summary>
21 /// <param name="repository">The collection that represent a in-memory repository.</param>
22 /// <param name="findPredicate">The predicate an instance by the persisted value.</param>
23 /// <param name="idGetter">The getter of the persisted value.</param>
24 protected GenericWellKnownInstanceType(IEnumerable<T> repository, Func<T, TId, bool> findPredicate, Func<T, TId> idGetter)
25 {
26 this.repository = repository;
27 this.findPredicate = findPredicate;
28 this.idGetter = idGetter;
29 }
30
31 //public SqlType[] SqlTypes
32 //{
33 // get { return ReturnSqlTypes; }
34 //}
35
36 public Type ReturnedType
37 {
38 get { return typeof(T); }
39 }
40
41 public bool IsMutable
42 {
43 get { return false; }
44 }
45
46 public new bool Equals(object x, object y)
47 {
48 if (ReferenceEquals(x, y))
49 {
50 return true;
51 }
52 if (ReferenceEquals(null, x) || ReferenceEquals(null, y))
53 {
54 return false;
55 }
56
57 return x.Equals(y);
58 }
59
60 public int GetHashCode(object x)
61 {
62 return (x == null) ? 0 : x.GetHashCode();
63 }
64
65 public object NullSafeGet(IDataReader rs, string[] names, object owner)
66 {
67 int index0 = rs.GetOrdinal(names[0]);
68 if (rs.IsDBNull(index0))
69 {
70 return null;
71 }
72
73 var value = (TId)rs.GetValue(index0);
74 return repository.FirstOrDefault(x => findPredicate(x, value));
75 }
76
77 public void NullSafeSet(IDbCommand cmd, object value, int index)
78 {
79 if (value == null)
80 {
81 ((IDbDataParameter)cmd.Parameters[index]).Value = DBNull.Value;
82 }
83 else
84 {
85 ((IDbDataParameter)cmd.Parameters[index]).Value = idGetter((T)value);
86 }
87 }
88
89 public object DeepCopy(object value)
90 {
91 return value;
92 }
93
94 public object Replace(object original, object target, object owner)
95 {
96 return original;
97 }
98
99 public object Assemble(object cached, object owner)
100 {
101 return cached;
102 }
103
104 public object Disassemble(object value)
105 {
106 return value;
107 }
108
109 /// <summary>
110 /// The SQL types for the columns mapped by this type.
111 /// </summary>
112 public abstract SqlType[] SqlTypes { get; }
113 }
114 }