.net core qr code Generating a Consolidated Property List in Visual Basic .NET

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Generating a Consolidated Property List
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What algorithm is used to set and get property values from this array in a meaningful manner In short, each property is assigned a numeric index value between 0 and the number of properties registered for the business object type. Assigning these index values is the challenge, and it is complicated by inheritance. Earlier in the chapter, I discussed the PropertyInfoManager and how it maintains a list of IPropertyInfo objects for each business object type. Remember that a business object type might be a subclass of some other type. It turns out that any level in the inheritance hierarchy might declare a property and register it by calling RegisterProperty(). This means that to get a consolidated list of all properties declared by a business object, it is necessary to walk through all the types in the inheritance hierarchy, getting the list of IPropertyInfo objects for each of the types. Obviously, that process could be relatively expensive, so it is done only once, and the result is cached. FieldDataManager includes a GetConsolidatedList() method that retrieves the consolidated list of properties if it has already been generated, or it calls CreateConsolidatedList() to create the list. The CreateConsolidatedList() method is the interesting part of this process, because it assembles the consolidated list and assigns the numeric index values. Here is the method from the FieldDataManager class: Private Shared Function CreateConsolidatedList(ByVal type As Type) _ As List(Of IPropertyInfo) Dim result As New List(Of IPropertyInfo)())() ' get inheritance hierarchy Dim current As Type = type Dim hierarchy As New List(Of Type)())() Do hierarchy.Add(current) current = current.BaseType Loop While current IsNot Nothing _ AndAlso Not current.Equals(GetType(BusinessBase)) ' walk from top to bottom to build consolidated list For index As Integer = hierarchy.Count - 1 To 0 Step -1 result.AddRange( _ PropertyInfoManager.GetPropertyListCache(hierarchy(index))) Next index ' set Index properties on all unindexed PropertyInfo objects Dim max As Integer = -1 For Each item In result If item.Index = -1 Then max += 1 item.Index = max
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Else max = item.Index End If Next item ' return consolidated list Return result End Function There s a lot going on here, so let s break it down. The first step is to get a list of all the types in this object s inheritance hierarchy: Dim current As Type = type Dim hierarchy As New List(Of Type)())() Do hierarchy.Add(current) current = current.BaseType Loop While current IsNot Nothing _ AndAlso Not current.Equals(GetType(BusinessBase)) Since the FieldDataManager and the RegisterProperty() methods are declared in the BusinessBase class, there s no sense going any higher than that class. The result of this code is that the hierarchy field has a list of the types in this inheritance hierarchy, with the topmost base class being the last item in the list. The next step is to loop through all those types, getting the list of any registered properties for each type. This is done from top to bottom, so the deepest base class is processed first. For index As Integer = hierarchy.Count - 1 To 0 Step -1 result.AddRange( _ PropertyInfoManager.GetPropertyListCache(hierarchy(index))) Next index Remember that the registered properties for each type are stored in sorted order, so this algorithm guarantees that you end up with a consolidated list in the result field, where the IPropertyInfo objects are sorted within each type, and where the list starts with the deepest base type and moves out to end with the actual business object type. Since the order is known and consistent in all cases, it is then possible to loop through all the IPropertyInfo objects and assign them a numeric index value, starting at 0 and counting up. Dim max As Integer = -1 For Each item In result If item.Index = -1 Then max += 1 item.Index = max Else max = item.Index End If Next item Of course, the value is set only if it hasn t been set to start with. In the PropertyInfo class, the index value is initialized to -1, and this loop changes the value only if it is still set to that initial default. This is important, because a given base class could be the base class for numerous business classes, and the index values for that base class should be set only once. The end result of this work is that there s a consolidated list of all registered properties for the business object type, that those properties are in a consistent order, and that each IPropertyInfo object has a unique numeric index value that you can use to index into the array of IFieldData objects where the actual object s field data is stored.
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