Add command line option to specify route generation strategy

[eyip002]

For large railway layouts, the generation of all possible routes between pairs of signals takes too much memory and time. Add a command line option to generate simple routes between a source signal and an immediate destination signal, or extended routes between any two signals (with possibly zero or more intermediate signals).

• [x] Add command line option -r <route> route generation mode (simple, extended)
• [x] Update route generation algorithm

[eyip002]

Command line option is added to the EMF resource so that it can be accessed by the layout generator.

[trinnguyen]

@eyip002 Just a suggestion for passing the command line option from to Layout generator, another option is to making use of: GeneratorContext if you have problem with the current approach.

• Create new class inherits from GeneratorContext with a property for route option value, example:

class BahnGeneratorContext extends GeneratorContext {
    private String route;

    // getter, setter
}

• In the BahnGenerator, can cast the IGeneratorContext context parameter to BahnGeneratorContext and use the route option directly without changing the EMF resource.

[eyip002]

@trinnguyen thanks for the hint! I current approach with the EMF resource works now, but your suggestion looks better. I will try and implement it.

[eyip002]

Now implemented in https://github.com/trinnguyen/bahndsl/commit/e3cc6992a25e332ad22886ed10cf2e121fc79dfb and https://github.com/trinnguyen/bahndsl/commit/281944072293953c815bfc91194236dcaa63569b

[eyip002]

Minor fix to support Eclipse. Eclipse RCP creates its own context using GeneratorContext, so a check is needed to see if IGeneratorContext context is of an instance of BahnGeneratorContext.