Class Diagram

The Universal Modeling Language is used to describe a software system [4, 5], Several kinds of diagrams exist to model the diverse properties of the system. Thus a description of the system can be developed that enables the systematic and uniform documentation of the system. The class diagram, for example, represents the classes and their relationships. But also interacting diagrams exist, to describe the dynamic behavior of the system and its objects. 

Some tools and authors use the term class diagram. We reserve class for the most detailed level of design, representing what s actually in the code. A class box (marked class ) shows all the directly stored attributes and links of its instances. A type is more general Its attributes and associations represent information that can be known about any of its members, without stating how. We use types much more than classes in analysis, and both during design. 

Sometimes you see a wall covered with a big class diagram that contains hundreds of little boxes. These diagrams are not very useful except for your boss to show off to her boss. It is difficult to find your way around such a diagram and difficult for people new to the project to know where to start. Diagrams should be used as part of a narrative explanation and not just on their own. Documentation should be structured so that the important, overall issues come first, with the detail filled in later. 

A class diagram is just a type diagram with a different emphasis. The purpose of a class diagram is to represent the classes that appear in the code and the roles that they take in the working software. 

Because a class diagram is closer to code, navigability arrowheads appear on the links. Annotations relating to privacy can also be added. 

At the lowest level, class diagrams can correspond directly to program code attributes and associations turn into pointers or (in languages such as C++) contained objects. Many 00 design tools provide the means to turn a class diagram into skeleton code and vice versa. However, we should be careful not to use this facility too readily it is useful only at the very bottom layer of design. 

As is often the case when working out an interaction, we find we have brought new elements into the design. These elements should now be incorporated into the class diagram... 

Notice that although the interaction diagram is useful for illustrating specific cases, the class diagram (with associated dictionary, specifications, and code) is the canonical... 

Figure 6.35 Update class diagram with localized actions and specs.

Suppose the compound state transition only involves structure changes and undo only needs to recover the structure and the compound state. Figure 12.6 is the class diagram of the Memento Pattern for the Compound object. 

Figure 12.6 The class diagram of the Memento Pattern for the Compound object.

Figure 12.11 The class diagram of structure property calculator.

Figure 12.14 The class diagram of ChemicalLibrary-ChemicalSample composite hierarchy.

Figure 12.16 is the class diagram that shows LSIFactory and the LSIValidator... 

In a compound registration system, compound data can be imported from data files such as SD File, XML File, or Mobile. Alternatively, data can be entered from the presentation layer using a structure drawing package such as ISISDraw or ChemDraw. These data, once imported to the system, need to be bound to the domain objects in order for the system to process them efficiently. To support a variety of data sources, a Data Binder API is needed to decouple the system from specific format of input data and make it easily extensible to support other data input formats down the road. Figure 12.17 is the class diagram of the Data Binder API. 

Figure 12.18 The class diagram of Application Controller and its collaborators.

In this chapter, we present a way of caching the Entity Dictionary—the lookup data. Figure 13.1 is the class diagram of the Entity Dictionary framework. 

Figure 13.1 The class diagram of the Entity Dictionary, public class EntityDictionaryDao ...

Figure 14.2 The class diagram of the CRS Cheshire Chemistry Intelligence Framework.

Now we are ready to develop the data mapper for the Compound object—the CompoundMapper class. The following class diagram describes Compound Mapper s relationship with the two interfaces (Figure 15.1). 

These remarks have been carefully taken into account for the database implementation. Figure 2 represents the Unified Modeling Language (UML) class diagram we have chosen corresponding to the ER diagram in Figure 1. 

Figure 8.12. Structures of lipid classes. (Diagrams appear in Handbook of Sorbent Extraction...

In figures, the notation of UML class diagrams is used. Boxes represent classes, lines represent relations, and dashed arrows represent instantiation. Aggregation relations are represented through a white diamond-shaped arrowhead pointing towards the aggregate class. Similarly, composition relations are indicated by a black diamond-shaped arrowhead. 

Since VDDL does not provide a graphical representation, parts of VeDa have been additionally represented through UML class diagrams for reasons of clarity. 

Figure 3.23 shows the structure of links in a UML class diagram [560]. Most constraints needed for a detailed definition are omitted, only examples are shown. An increment can have different roles w.r.t. a referencing link Increments can be owned by a link or be referenced as context increments. While an increment can belong to at most one link as owned increment, it can be referenced by an arbitrary number of links as context increments. Owned increments can be created during rule execution, whereas only existing increments can be referenced by new links as context increments. 

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