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Chapter 9. openETCS Generator Application
DSM Similar to the GOPPRR package and the libGOPPRR library, the DSM package is
also independent from the used meta model and can be deployed as library. The corresponding
deployment diagram can be found in Figure 9.5. Again, the ExceptionTypes artefact holds all
Figure 9.5.: UML deployment diagram for the DSM library
types used for raising exceptions. Since the libDSM builds the link between any meta model
of GOPPRR and a concrete generator, it also requires and imports the classes provided by
the libGOPPRR library. This is sketched in Figure 9.6. The libDSM library itself provides
all classes for transforming a GOPPRR XML file, as intermediate model, into objects of the
libGOPPRR library classes.
GEN As already described before, the GEN package implements the openETCS generator
application as executable binary. Since it is deployed in only one component, the related
diagram in Figure 9.7 is as simple as for libGOPPRR and libDSM. In contrast to those two
other components, the openETCSGenerator does not provide any classes but requires those
from the two libraries. The component diagram in Figure 9.8 shows corresponding import of
classes.
9.5. Implementation
Due to the nature of the generator application, the interaction between the generator classes
or rather objects is low. Mainly, a CMain object calls a CGOPPRRTransformer instance to
convert a GOPPRR XML file into a CGOPPRRSyntaxTree to finally call all generator instances
and the constraint checker. Thus, an own section for the behavioural design is spared for the
openETCS generator application and the section directly proceeds with the implementation of
the structural design.
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