public ProxyTypeBuilder(ClrEntityType ospaceEntityType)
{
_ospaceEntityType = ospaceEntityType;
_baseImplementor = new BaseProxyImplementor();
_ipocoImplementor = new IPOCOImplementor(ospaceEntityType);
_lazyLoadImplementor = new LazyLoadImplementor(ospaceEntityType);
_dataContractImplementor = new DataContractImplementor(ospaceEntityType);
_iserializableImplementor = new ISerializableImplementor(ospaceEntityType);
}
public bool EmitMember(TypeBuilder typeBuilder, EdmMember member, PropertyBuilder propertyBuilder, PropertyInfo baseProperty, BaseProxyImplementor baseImplementor)
{
if (_members.Contains(member))
{
MethodInfo baseGetter = baseProperty.GetGetMethod(true);
const MethodAttributes getterAttributes = MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.Virtual;
MethodAttributes getterAccess = baseGetter.Attributes & MethodAttributes.MemberAccessMask;
// Define field to store interceptor Func
// Signature of interceptor Func delegate is as follows:
//
// bool intercept(ProxyType proxy, PropertyType propertyValue)
//
// where
// PropertyType is the type of the Property, such as ICollection<Customer>,
// ProxyType is the type of the proxy object,
// propertyValue is the value returned from the proxied type's property getter.
Type interceptorType = typeof(Func<,,>).MakeGenericType(typeBuilder, baseProperty.PropertyType, typeof(bool));
MethodInfo interceptorInvoke = TypeBuilder.GetMethod(interceptorType, typeof(Func<,,>).GetMethod("Invoke"));
FieldBuilder interceptorField = typeBuilder.DefineField(GetInterceptorFieldName(baseProperty.Name), interceptorType, FieldAttributes.Private | FieldAttributes.Static);
// Define a property getter override in the proxy type
MethodBuilder getterBuilder = typeBuilder.DefineMethod("get_" + baseProperty.Name, getterAccess | getterAttributes, baseProperty.PropertyType, Type.EmptyTypes);
ILGenerator generator = getterBuilder.GetILGenerator();
// Emit instructions for the following call:
// T value = base.SomeProperty;
// if(this._interceptorForSomeProperty(this, value))
// { return value; }
// return base.SomeProperty;
// where _interceptorForSomeProperty represents the interceptor Func field.
Label lableTrue = generator.DefineLabel();
generator.DeclareLocal(baseProperty.PropertyType); // T value
generator.Emit(OpCodes.Ldarg_0); // call base.SomeProperty
generator.Emit(OpCodes.Call, baseGetter); // call to base property getter
generator.Emit(OpCodes.Stloc_0); // value = result
generator.Emit(OpCodes.Ldarg_0); // load this
generator.Emit(OpCodes.Ldfld, interceptorField); // load this._interceptor
generator.Emit(OpCodes.Ldarg_0); // load this
generator.Emit(OpCodes.Ldloc_0); // load value
generator.Emit(OpCodes.Callvirt, interceptorInvoke); // call to interceptor delegate with (this, value)
generator.Emit(OpCodes.Brtrue_S, lableTrue); // if true, just return
generator.Emit(OpCodes.Ldarg_0); // else, call the base propertty getter again
generator.Emit(OpCodes.Call, baseGetter); // call to base property getter
generator.Emit(OpCodes.Ret);
generator.MarkLabel(lableTrue);
generator.Emit(OpCodes.Ldloc_0);
generator.Emit(OpCodes.Ret);
propertyBuilder.SetGetMethod(getterBuilder);
baseImplementor.AddBasePropertyGetter(baseProperty);
return true;
}
return false;
}
public bool EmitMember(TypeBuilder typeBuilder, EdmMember member, PropertyBuilder propertyBuilder, PropertyInfo baseProperty, BaseProxyImplementor baseImplementor)
{
if (_scalarMembers.Contains(member))
{
bool isKeyMember = _ospaceEntityType.KeyMembers.Contains(member.Identity);
EmitScalarSetter(typeBuilder, propertyBuilder, baseProperty, isKeyMember);
return true;
}
else if (_relationshipMembers.Contains(member))
{
Debug.Assert(member != null, "member is null");
Debug.Assert(member.BuiltInTypeKind == BuiltInTypeKind.NavigationProperty);
NavigationProperty navProperty = member as NavigationProperty;
if (navProperty.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many)
{
EmitCollectionProperty(typeBuilder, propertyBuilder, baseProperty, navProperty);
}
else
{
EmitReferenceProperty(typeBuilder, propertyBuilder, baseProperty, navProperty);
}
baseImplementor.AddBasePropertySetter(baseProperty);
return true;
}
return false;
}