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