Inherited Relationships in C#.NET

Encode Quick Response Code in C#.NET Inherited Relationships
Inherited Relationships
QR Generator In C#.NET
Using Barcode printer for .NET Control to generate, create QR Code image in .NET framework applications.
One last improvement can be made to this model We have chosen the multiplicities on each role to t the situations depicted in the example snapshots But there is also another restriction From the snapshot, you can see that an IssueCategory can belong to a Project or it can be a subcategory of another IssueCategory Trying out variations on this snapshot would soon reveal that it cannot both belong to a project and be a subcategory, and would also raise the question of whether it could belong to two projects or be subcategories of different categories Assuming that none of these situations is allowed, we
Bar Code Encoder In C#.NET
Using Barcode creator for VS .NET Control to generate, create bar code image in .NET framework applications.
Developing the Domain Model
QR Creation In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create Denso QR Bar Code image in ASP.NET applications.
conclude that an IssueCategory should only have one parent whether it is another IssueCategory or a Project To represent this information, we can create a class that abstracts the IssueCategory-parenting characteristics of Project and IssueCategory, as shown in Figure 11-7
Encoding Denso QR Bar Code In .NET
Using Barcode creator for .NET Control to generate, create QR Code ISO/IEC18004 image in .NET applications.
Figure 11-7: Domain model CategoryParent
QR Encoder In Visual Basic .NET
Using Barcode printer for .NET framework Control to generate, create Denso QR Bar Code image in .NET applications.
The relationship CategoryParentHasCategories from CategoryParent to IssueCategory has a multiplicity of 1 at the parent end By forcing the other two relationships of IssueCategory (to parent Project and parent
Bar Code Generator In Visual C#.NET
Using Barcode maker for Visual Studio .NET Control to generate, create bar code image in VS .NET applications.
11: De signing a DSL
Make Barcode In C#
Using Barcode creation for VS .NET Control to generate, create bar code image in .NET framework applications.
IssueCategory) to be subrelationships of CategoryParentHasCategories, we force there to be only one element at a time playing the parent role in a relationship Thus, each IssueCategory must either be embedded under a Project or under another IssueCategory, but not both
Printing Code39 In C#
Using Barcode printer for .NET framework Control to generate, create Code 39 image in VS .NET applications.
Issue State Domain Model
Code 128 Code Set B Maker In Visual C#
Using Barcode printer for .NET Control to generate, create Code 128 Code Set B image in .NET applications.
Now we turn to the Issue State part of the domain, shown in Figure 11-8 We ve added an extra IssueStateModel root domain class in which the projects are embedded Top level states are then embedded in projects, and other states embedded beneath them The chain of states headed by the project seemed natural enough to the CJKW developers when they drew it on the whiteboard at rst, but more experienced modelers may nd it slightly odd We ll see how this initial domain model is evolved as the notation is explored
ECC200 Creator In C#
Using Barcode creation for VS .NET Control to generate, create Data Matrix image in VS .NET applications.
Issue State
Bar Code Encoder In .NET
Using Barcode drawer for .NET Control to generate, create bar code image in .NET applications.
Project bug Initial state IssueState Unassigned IssueState Rejected Allowed state transitions
Encoding Barcode In Java
Using Barcode printer for Java Control to generate, create bar code image in Java applications.
IssueState Assigned IssueState Completed
Code 39 Full ASCII Maker In Visual Basic .NET
Using Barcode generation for .NET framework Control to generate, create Code 39 image in .NET applications.
Figure 11-8: Issue State domain model
Universal Product Code Version A Encoder In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create UPC Code image in ASP.NET applications.
Developing the Notation
Code 128 Code Set C Drawer In VB.NET
Using Barcode printer for Visual Studio .NET Control to generate, create Code 128 Code Set B image in Visual Studio .NET applications.
We have a domain model, which just de nes the concepts that the language deals in; now we want to decide how it looks on the screen and what you can
Creating DataMatrix In VB.NET
Using Barcode encoder for .NET framework Control to generate, create Data Matrix image in Visual Studio .NET applications.
Developing the Notation
Creating Bar Code In VB.NET
Using Barcode generator for .NET framework Control to generate, create barcode image in VS .NET applications.
do with it in the designer Given that notations in the DSL Tools are currently mostly restricted to nodes and lines, we might at rst think that, looking at the snapshots we have drawn, we need only decide the shapes of the nodes However, that isn t quite true there are some decisions still to be made It s worth reiterating that no development process is linear It is at this point that we converge with those who have known all along what their notation is going to look like, as we discussed in an earlier section In fact, we generally move quite rapidly between trying out concrete notations, investigating the underlying domain model, and sketching snapshots of the surrounding context Working with the domain model and snapshots helps ensure we are including everything we need the DSL to say; experimenting with concrete notation helps understand how we want to say it There are four ways to represent a relationship in concrete syntax: 1 Connector Each link of the relationship maps to a connector on the diagram, with the related elements represented as shapes This is how we have drawn all the relationships in the snapshots; it works for any relationship 2 Nesting A shape nesting inside a swimlane or other shape can represent a one-one or one-many relationship For example, subcategories can be shown as shapes inside their parent categories 3 Compartments An item in a compartment list shows a chosen property of the other end of a one-many relationship The disadvantages are that it only shows one line of information about the target and can t nest deeper than one level The bene t is that it is very compact compared to having a complete shape per element 4 Explorer only The relationship is not shown on the diagram and just appears in the language explorer
Code-39 Maker In Java
Using Barcode creation for Java Control to generate, create Code 39 Full ASCII image in Java applications.
Creating Barcode In Java
Using Barcode encoder for Java Control to generate, create bar code image in Java applications.