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1 using System;
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2 using System.ComponentModel;
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3 using System.Reflection;
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4 using BLToolkit.Mapping;
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5 using BLToolkit.Reflection;
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6
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7 namespace BLToolkit.Validation
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8 {
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9 public class ValidationContext
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10 {
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11 public delegate bool IsNullHandler(ValidationContext context);
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12
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13 private object _object;
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14 public object Object
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15 {
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16 get { return _object; }
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17 set { _object = value; }
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18 }
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19
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20 private TypeAccessor _typeAccessor;
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21 public TypeAccessor TypeAccessor
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22 {
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23 get
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24 {
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25 if (_typeAccessor == null)
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26 _typeAccessor = TypeAccessor.GetAccessor(_object.GetType());
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27
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28 return _typeAccessor;
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29 }
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30 }
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31
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32 private PropertyDescriptor _propertyDescriptor;
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33 public PropertyDescriptor PropertyDescriptor
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34 {
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35 get { return _propertyDescriptor; }
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36 set { _propertyDescriptor = value; }
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37 }
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38
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39 private IsNullHandler _isNull;
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40 public IsNullHandler IsNull
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41 {
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42 get { return _isNull; }
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43 set { _isNull = value; }
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44 }
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45
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46 public bool IsValueNull
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47 {
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48 get { return _isNull(this); }
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49 }
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50
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51 private object _value;
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52 public object Value
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53 {
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54 get { return _value; }
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55 set
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56 {
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57 _value = value;
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58 _nullValue = null;
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59 }
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60 }
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61
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62 private MemberAccessor _memberAccessor;
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63 public MemberAccessor MemberAccessor
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64 {
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65 get { return _memberAccessor; }
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66 set
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67 {
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68 _memberAccessor = value;
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69 _memberInfo = value != null? value.MemberInfo: null;
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70 }
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71 }
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72
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73 private MemberInfo _memberInfo;
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74 public MemberInfo MemberInfo
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75 {
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76 get { return _memberInfo; }
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77 }
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78
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79 private object _nullValue;
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80 public object NullValue
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81 {
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82 get
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83 {
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84 if (_nullValue == null)
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85 {
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86 if (_value == null)
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87 throw new InvalidOperationException("NullValue is undefined when Value == null");
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88
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89 ObjectMapper om = Map.GetObjectMapper(Object.GetType());
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90 MemberMapper mm = om[MemberName, true];
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91
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92 _nullValue =
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93 mm != null && mm.MapMemberInfo.Nullable && mm.MapMemberInfo.NullValue != null?
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94 mm.MapMemberInfo.NullValue:
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95 TypeAccessor.GetNullValue(Value.GetType());
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96
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97 if (_nullValue == null)
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98 _nullValue = DBNull.Value;
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99 }
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100
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101 return _nullValue;
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102
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103 }
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104 }
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105
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106 public string MemberName
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107 {
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108 get
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109 {
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110 return
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111 _memberInfo != null? _memberInfo.Name:
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112 #if !SILVERLIGHT
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113 _propertyDescriptor != null? _propertyDescriptor.Name:
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114 #endif
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115 null;
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116 }
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117 }
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118 }
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119 }
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