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1 using System;
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2 using System.Reflection;
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3 using System.Reflection.Emit;
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4 using BLToolkit.Reflection;
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5 using BLToolkit.Reflection.Emit;
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6
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7 namespace BLToolkit.TypeBuilder.Builders
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8 {
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9 public class PropertyChangedBuilder : AbstractTypeBuilderBase
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10 {
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11 public PropertyChangedBuilder()
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12 : this(Common.Configuration.NotifyOnEqualSet, true, true)
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13 {
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14 }
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15
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16 public PropertyChangedBuilder(bool notifyOnEqualSet, bool useReferenceEquals, bool skipSetterOnNoChange)
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17 {
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18 _notifyOnEqualSet = notifyOnEqualSet;
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19 _useReferenceEquals = useReferenceEquals;
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20 _skipSetterOnNoChange = skipSetterOnNoChange;
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21 }
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22
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23 private readonly bool _notifyOnEqualSet;
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24 private readonly bool _useReferenceEquals;
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25 private readonly bool _skipSetterOnNoChange;
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26
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27 public override bool IsApplied(BuildContext context, AbstractTypeBuilderList builders)
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28 {
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29 if (context == null) throw new ArgumentNullException("context");
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30
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31 return context.IsSetter && (context.IsBeforeStep || context.IsAfterStep);
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32 }
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33
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34 protected override void BeforeBuildAbstractSetter()
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35 {
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36 if (!_notifyOnEqualSet && Context.CurrentProperty.CanRead)
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37 GenerateIsSameValueComparison();
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38 }
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39
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40 protected override void BeforeBuildVirtualSetter()
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41 {
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42 if (!_notifyOnEqualSet && Context.CurrentProperty.CanRead)
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43 GenerateIsSameValueComparison();
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44 }
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45
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46 protected override void AfterBuildAbstractSetter()
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47 {
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48 BuildSetter();
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49 }
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50
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51 protected override void AfterBuildVirtualSetter()
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52 {
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53 BuildSetter();
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54 }
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55
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56 public override bool IsCompatible(BuildContext context, IAbstractTypeBuilder typeBuilder)
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57 {
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58 if (typeBuilder is PropertyChangedBuilder)
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59 return false;
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60
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61 return base.IsCompatible(context, typeBuilder);
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62 }
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63
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64 public override int GetPriority(BuildContext context)
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65 {
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66 return TypeBuilderConsts.Priority.PropChange;
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67 }
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68
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69 private LocalBuilder _isSameValueBuilder;
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70 private Label _afterNotificationLabel;
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71
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72 private void GenerateIsSameValueComparison()
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73 {
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74 EmitHelper emit = Context.MethodBuilder.Emitter;
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75
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76 if (_skipSetterOnNoChange)
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77 _afterNotificationLabel = emit.DefineLabel();
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78 else
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79 _isSameValueBuilder = emit.DeclareLocal(typeof(bool));
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80
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81 MethodInfo op_InequalityMethod =
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82 Context.CurrentProperty.PropertyType.GetMethod("op_Inequality",
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83 new Type[]
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84 {
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85 Context.CurrentProperty.PropertyType,
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86 Context.CurrentProperty.PropertyType
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87 });
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88
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89 if (op_InequalityMethod == null)
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90 {
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91 if (Context.CurrentProperty.PropertyType.IsValueType)
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92 {
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93 if (TypeHelper.IsNullableType(Context.CurrentProperty.PropertyType))
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94 {
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95 // Handled nullable types
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96
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97 var currentValue = emit.DeclareLocal(Context.CurrentProperty.PropertyType);
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98 var newValue = emit.DeclareLocal(Context.CurrentProperty.PropertyType);
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99 var notEqualLabel = emit.DefineLabel();
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100 var comparedLabel = emit.DefineLabel();
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101 var hasValueGetMethod = Context.CurrentProperty.PropertyType.GetProperty("HasValue").GetGetMethod();
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102
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103 emit
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104 .ldarg_0
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105 .callvirt(Context.CurrentProperty.GetGetMethod(true))
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106 .stloc(currentValue)
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107 .ldarg_1
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108 .stloc(newValue)
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109 .ldloca(currentValue)
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110 .call(Context.CurrentProperty.PropertyType, "GetValueOrDefault")
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111 .ldloca(newValue)
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112 .call(Context.CurrentProperty.PropertyType, "GetValueOrDefault");
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113
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114 var nullableUnderlyingType = TypeHelper.GetUnderlyingType(Context.CurrentProperty.PropertyType);
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115
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116 op_InequalityMethod = nullableUnderlyingType.GetMethod("op_Inequality",
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117 new Type[]
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118 {
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119 nullableUnderlyingType,
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120 nullableUnderlyingType
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121 });
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122
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123 if (op_InequalityMethod != null)
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124 {
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125 emit
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126 .call(op_InequalityMethod)
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127 .brtrue_s(notEqualLabel);
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128 }
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129 else
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130 emit.bne_un_s(notEqualLabel);
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131
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132 emit
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133 .ldloca(currentValue)
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134 .call(hasValueGetMethod)
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135 .ldloca(newValue)
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136 .call(hasValueGetMethod)
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137 .ceq
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138 .ldc_bool(true)
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139 .ceq
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140 .br(comparedLabel)
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141 .MarkLabel(notEqualLabel)
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142 .ldc_bool(false)
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143 .MarkLabel(comparedLabel)
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144 .end();
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145 }
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146 else if (!Context.CurrentProperty.PropertyType.IsPrimitive)
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147 {
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148 // Handle structs without op_Inequality.
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149 var currentValue = emit.DeclareLocal(Context.CurrentProperty.PropertyType);
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150
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151 emit
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152 .ldarg_0
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153 .callvirt(Context.CurrentProperty.GetGetMethod(true))
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154 .stloc(currentValue)
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155 .ldloca(currentValue)
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156 .ldarg_1
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157 .box(Context.CurrentProperty.PropertyType)
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158 .constrained(Context.CurrentProperty.PropertyType)
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159 .callvirt(typeof(object), "Equals", new [] {typeof(object)})
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160 .end();
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161 }
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162 else
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163 {
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164 // Primitive value type comparison
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165 emit
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166 .ldarg_0
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167 .callvirt(Context.CurrentProperty.GetGetMethod(true))
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168 .ldarg_1
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169 .ceq
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170 .end();
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171 }
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172 }
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173 else if (!_useReferenceEquals)
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174 {
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175 // Do not use ReferenceEquals comparison for objects
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176 emit
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177 .ldarg_0
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178 .callvirt(Context.CurrentProperty.GetGetMethod(true))
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179 .ldarg_1
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180 .ceq
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181 .end();
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182 }
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183 else
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184 {
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185 // ReferenceEquals comparison for objects
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186 emit
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187 .ldarg_0
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188 .callvirt(Context.CurrentProperty.GetGetMethod(true))
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189 .ldarg_1
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190 .call(typeof(object), "ReferenceEquals", typeof(object), typeof(object))
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191 .end();
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192 }
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193 }
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194 else
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195 {
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196 // Items compared have op_Inequality operator (!=)
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197 emit
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198 .ldarg_0
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199 .callvirt(Context.CurrentProperty.GetGetMethod(true))
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200 .ldarg_1
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201 .call(op_InequalityMethod)
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202 .ldc_i4_0
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203 .ceq
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204 .end();
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205 }
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206
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207 if (_skipSetterOnNoChange)
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208 emit.brtrue(_afterNotificationLabel);
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209 else
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210 emit.stloc(_isSameValueBuilder);
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211 }
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212
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213 private void BuildSetter()
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214 {
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215 InterfaceMapping im = Context.Type.GetInterfaceMap(typeof(IPropertyChanged));
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216 MethodInfo mi = im.TargetMethods[0];
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217 FieldBuilder ifb = GetPropertyInfoField();
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218 EmitHelper emit = Context.MethodBuilder.Emitter;
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219
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220 if (!_notifyOnEqualSet && Context.CurrentProperty.CanRead && !_skipSetterOnNoChange)
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221 {
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222 _afterNotificationLabel = emit.DefineLabel();
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223 emit
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224 .ldloc (_isSameValueBuilder)
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225 .brtrue(_afterNotificationLabel);
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226 }
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227
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228 if (mi.IsPublic)
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229 {
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230 emit
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231 .ldarg_0
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232 .ldsfld (ifb)
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233 .callvirt (mi)
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234 ;
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235 }
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236 else
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237 {
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238 emit
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239 .ldarg_0
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240 .castclass (typeof(IPropertyChanged))
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241 .ldsfld (ifb)
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242 .callvirt (im.InterfaceMethods[0])
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243 ;
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244 }
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245
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246 if (!_notifyOnEqualSet && Context.CurrentProperty.CanRead)
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247 emit.MarkLabel(_afterNotificationLabel);
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248 }
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249 }
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250 }
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