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have developed by basing a new class on the code of the existing one If we have the class ScreenObject, we can use this as the basis of a new class, say PrinterObject that de nes much of its behaviour in terms of the existing class In this case, we would alter the existing method Display so that it sent the picture of the object to a printer instead of the display screen De ning a class with code inheritance is often easier than de ning a new class from scratch, since all of the features of the existing class automatically become features of the new one The design of the new class is then a matter of adding new properties or methods to it, or changing some of the inherited features However, since the use of code inheritance suggests a strong Is-A relationship, it is important that the designer ensures that this relationship actually exists between the existing class and the class he or she intends to create from it For example, a na ve designer may consider that the relationship between circles of different colours, as shown in Figure 23, is actually an inheritance We have a Circle class, and from it we can develop a WhiteCircle class and a GreyCircle class This will certainly make it easier to create circles of the speci ed colour on demand in a program for a white circle, create an instance of the WhiteCircle class and for a grey one create a GreyCircle object However, what if it is later necessary to add a feature to change the colour of a Circle object Using the inheritance scheme, it will now be necessary to destroy one circle and create another to take its place Had colour simply been a property of the object as suggested earlier, it could be changed by simply passing a message Code inheritance is a double-edged sword, and many programmers have come to consider it a feature that should be used sparingly and with great care Inheritance relationships are often more complex than as rst appears, and while considered use of the facility can result in classes that are easier to develop, maintain and use, badly thought out inheritance relationships are likely to produce classes that are dif cult to use and adapt to new circumstances As an example, consider the inheritance scenario shown in Figure 29 Changes to the base class (class A) may or may not affect classes B to E This may or may not be the intention of the programmer, and requires careful design and coding to control The changes can affect any applications that use any of the classes, and may introduce subtle errors that are dif cult to nd This problem is not con ned to inheritance relationships since it can also affect an aggregation or a composition relationship Therefore, even languages that do not support inheritance are vulnerable to it However, since an inheritance relationship is often more subtle, it is more likely that the problem would not be noticed as easily.

class Mapper public DomainObject AbstractFind(long id) { DataRow row = FindRow(id); if (row == null) return null; else { DomainObject result = CreateDomainObject(); Load(result, row); return result; } } private DataRow FindRow(long id) { String filter = StringFormat("id = {0}", id); DataRow[] results = tableSelect(filter); if (resultsLength == 0) return null; else return results[0]; } protected abstract DomainObject CreateDomainObject(); class CricketerMapper protected override DomainObject CreateDomainObject(){ return new Cricketer(); }

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that rather than use a special purpose attribute for this, it would be easier just to build the feature into every class However, there will generally be a lot of information in a program that you would not want to persist from run to run, and there are certain types of information that cannot automatically be persisted by the NET run time (for example, data that comes from software components not developed in a NET language such as old-style Visual Basic components from an earlier version) There is also an overhead in that a serializable class must incorporate extra code It is easier to allow a programmer to opt-in to a scheme than to have to opt-out of all the ones that will not be used, so serialization must be speci cally chosen by the programmer When you see the reduction in the amount of work you have to do, I think you ll agree it is a good deal To serialize the whole object model, we simply add some code to an object best placed to serialize and de-serialize it at run time; typically one that will be available as soon as a program starts to execute Normally, this will be the start-up form, so we would write the code shown in Listing 1116

The actual loading of data from the database is done by the load method, or rather by several load methods: one each for the mapper class and for all its superclasses

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Private Sub frmBank_Closing(ByVal sender As Object, _ ByVal e As SystemComponentModelCancelEventArgs) _ Handles MyBaseClosing Dim fileName As String = "c:\Data\BinAccountdat" Dim str As New IOFileStream(fileName, _ IOFileModeCreate) Dim b As New _ RuntimeSerializationFormattersBinaryBinaryFormatter() bSerialize(str, Account) strClose() End Sub Private Sub frmBank_Load(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) _ Handles MyBaseLoad Dim fileName As String = "c:\Data\BinAccountdat" If IOFileExists(fileName) Then Dim str As New IOFileStream(fileName, IOFileModeOpen) Dim b As New _ RuntimeSerializationFormattersBinaryBinaryFormatter() Account = CType(bDeserialize(str), BankAccount) strClose() End If End Sub Listing 1116: Serializing a serializable class model

class CricketerMapper protected override void Load(DomainObject obj, DataRow row) { baseLoad(obj,row); Cricketer cricketer = (Cricketer) obj; cricketerbattingAverage = (double)row["battingAverage"]; } class AbstractPlayerMapper

The key to serializing an entire class model like this is the BinaryFormatter class, found in the RunTimeSerializationFormattersBinary namespace Basically, this class s Serialize() method stores each member variable of the speci ed object (Account here) in turn as a binary image of its data in memory Where a member variable is in fact a non-value member, it stores an image of each member variable of that owned object and so on until the entire object model has

protected override void Load(DomainObject obj, DataRow row) { baseLoad(obj, row); Player player = (Player) obj; playername = (String)row["name"]; class Mapper protected virtual void Load(DomainObject obj, DataRow row) { objId = (int) row ["id"]; }

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