package org.andromda.metafacades.uml14;
   
   import java.util.Collection;
   import org.andromda.metafacades.uml.FrontEndController;
   import org.andromda.metafacades.uml.FrontEndUseCase;
   import org.andromda.metafacades.uml.ModelElementFacade;
   import org.andromda.metafacades.uml.PseudostateFacade;
   import org.andromda.metafacades.uml.TransitionFacade;
   import org.andromda.metafacades.uml.UMLProfile;
  import org.andromda.metafacades.uml.UseCaseFacade;
  
  
  /**
   * MetafacadeLogic implementation for org.andromda.metafacades.uml.FrontEndActivityGraph.
   *
   * @see org.andromda.metafacades.uml.FrontEndActivityGraph
   * @author Bob Fields
   */
  public class FrontEndActivityGraphLogicImpl
      extends FrontEndActivityGraphLogic
  {
      private static final long serialVersionUID = 815773525076250652L;
  
      /**
       * @param metaObject
       * @param context
       */
      public FrontEndActivityGraphLogicImpl (Object metaObject, String context)
      {
          super (metaObject, context);
      }
  
      /**
       * @see org.andromda.metafacades.uml.FrontEndActivityGraph#isContainedInFrontEndUseCase()
       */
      @Override
      protected boolean handleIsContainedInFrontEndUseCase()
      {
          return this.getUseCase() instanceof FrontEndUseCase;
      }
  
      /**
       * Retrieves the usecase that owns this activity.
       *
       * @see org.andromda.metafacades.uml14.ActivityGraphFacadeLogic#handleGetUseCase()
       */
      protected Object handleGetUseCase()
      {
          Object useCase = super.handleGetUseCase();
          if (useCase == null)
          {
              useCase = getModel().findUseCaseWithTaggedValueOrHyperlink(UMLProfile.TAGGEDVALUE_PRESENTATION_USECASE_ACTIVITY,
                      getName());
          }
          return useCase;
      }
  
      /**
       * @see org.andromda.metafacades.uml.FrontEndActivityGraph#getInitialAction()
       */
      @Override
      protected TransitionFacade handleGetInitialAction()
      {
          TransitionFacade firstAction = null;
          final Collection<PseudostateFacade> initialStates = getInitialStates();
          if (!initialStates.isEmpty())
          {
              final PseudostateFacade initialState = initialStates.iterator().next();
              final Collection<TransitionFacade> outgoings = initialState.getOutgoings();
              firstAction = outgoings.isEmpty() ? null : outgoings.iterator().next();
          }
          return firstAction;
      }
  
      /**
       * @see org.andromda.metafacades.uml.FrontEndActivityGraph#getController()
       */
      @Override
      protected Object handleGetController()
      {
          Object controller = null;
  
          final ModelElementFacade contextElement = this.getContextElement();
          if (contextElement instanceof FrontEndController)
          {
              controller = contextElement;
          }
  
           // - for those tools not supporting setting the context of an activity graph (such as Poseidon)
           //   an alternative is implemented: a tagged value on the controller, specifying the name of the use-case
           //
           // It is also allowed to set a hyperlink from the controller to the usecase
          if (controller == null)
          {
              final UseCaseFacade useCase = this.getUseCase();
              if (useCase != null)
              {
                  final String useCaseName = useCase.getName();
                  controller = this.getModel().findClassWithTaggedValueOrHyperlink(
                         UMLProfile.TAGGEDVALUE_PRESENTATION_CONTROLLER_USECASE, useCaseName);
             }
         }
         return controller;
     }
 }