Examples of org.eclipse.core.expressions.IEvaluationContext

org.eclipse.core.expressions.IEvaluationContext
An evaluation context is used to manage a set of objects needed during XML expression evaluation. A context has a parent context, can manage a set of named variables and has a default variable. The default variable is used during XML expression evaluation if no explicit variable is referenced.
This interface is not intended to be implemented by clients. Clients are allowed to instantiate EvaluationContext.
@since 3.0


  @SuppressWarnings("rawtypes")
  @Override
  public Object execute(ExecutionEvent event) throws ExecutionException {
    final String commandId = event.getCommand().getId();
    final IEvaluationContext context = (IEvaluationContext) event.getApplicationContext();
    
    final PHPStructuredEditor editor = (PHPStructuredEditor) context.getVariable(ISources.ACTIVE_PART_NAME);
    final ITextSelection selection = (ITextSelection) editor.getSelectionProvider().getSelection();
    
    final StructuredTextInvocationContext assistInvocation = new StructuredTextInvocationContext(editor.getViewer(), selection.getOffset(), selection.getLength(), new HashMap());
    
    final ICompletionProposal[] proposals = phpCorrectionProcessor.computeQuickAssistProposals(assistInvocation);

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  @Override
  public void setEnabled(Object evaluationContext) {
    
    try {
      IEvaluationContext context = (IEvaluationContext) evaluationContext;
      if (!(context.getVariable(ISources.ACTIVE_PART_NAME) instanceof PHPStructuredEditor)) {
        throw new IllegalArgumentException();
      }
      PHPStructuredEditor editor = (PHPStructuredEditor) context.getVariable(ISources.ACTIVE_PART_NAME);
      
      final ISelection selection = editor.getSelectionProvider().getSelection();
      if (!(selection instanceof ITextSelection)) {
        throw new IllegalArgumentException();
      }

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  public IEvaluationContext getFullContextSnapshot() {
    return fillInContext(true);
  }
  
  private IEvaluationContext fillInContext(boolean fullContext) {
    IEvaluationContext tmpContext = getCurrentState();


    EvaluationContext context = null;
    if (fullContext) {
      context = new EvaluationContext(null, tmpContext.getDefaultVariable());
      copyVariable(context, tmpContext, ISources.ACTIVE_CURRENT_SELECTION_NAME);
      copyVariable(context, tmpContext, ISources.ACTIVE_FOCUS_CONTROL_ID_NAME);
      copyVariable(context, tmpContext, ISources.ACTIVE_FOCUS_CONTROL_NAME);
      copyVariable(context, tmpContext, ISources.ACTIVE_MENU_EDITOR_INPUT_NAME);
      copyVariable(context, tmpContext, ISources.ACTIVE_MENU_NAME);

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      final Object trigger = event.getTrigger();


      // Attempt to update the selection.
      final Object applicationContext = event.getApplicationContext();
      if (applicationContext instanceof IEvaluationContext) {
        final IEvaluationContext context = (IEvaluationContext) applicationContext;
        updateDelegate(action, context);
      }


      // Decide what type of delegate we have.
      if ((delegate instanceof IActionDelegate2)

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  }


  public final boolean isEnabled() {
    final IHandlerService service = (IHandlerService) window
        .getService(IHandlerService.class);
    IEvaluationContext context = service.getCurrentState();
    return isEnabled(context);
  }

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{
  public static void openModel(EObject model)
  {
    IHandlerService handlerService  = (IHandlerService) PlatformUI.getWorkbench().getService(IHandlerService.class);


        IEvaluationContext context = handlerService.getCurrentState();
        context.addVariable(ActionHelper.ME_TO_OPEN_EVALUATIONCONTEXT_VARIABLE, model);


        try 
        {
          context.addVariable(ActionHelper.MECONTEXT_EVALUATIONCONTEXT_VARIABLE, ECPWorkspaceManager.getInstance().getWorkSpace().getProject(model));
            handlerService.executeCommand(ActionHelper.MEEDITOR_OPENMODELELEMENT_COMMAND_ID, null);
        } 
        catch (ExecutionException e)
        {
          DialogHandler.showExceptionDialog(e);

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      return false;
    }
  }
  
  private IEvaluationContext createContext(Object selection) {
    IEvaluationContext context = new EvaluationContext(null, selection);
    context.addVariable("selection", selection); //$NON-NLS-1$
    return context;
  }

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          return result;
        }
            }
            if (enablement != null) {
                try {
                    IEvaluationContext context = new EvaluationContext(null,
                            object);
                    context.setAllowPluginActivation(true);
                    context.addVariable("selection", object); //$NON-NLS-1$
                    EvaluationResult evalResult = enablement.evaluate(context);
                    if (evalResult == EvaluationResult.FALSE) {
            return false;
          }
                } catch (CoreException e) {

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   *            <code>null</code>.
   * @return <code>true</code> if the expression evaluates to
   *         <code>true</code>; <code>false</code> otherwise.
   */
  protected final boolean evaluate(final IEvaluationResultCache expression) {
    final IEvaluationContext contextWithDefaultVariable = getCurrentState();
    return expression.evaluate(contextWithDefaultVariable);
  }

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   */
  public final IEvaluationContext getCurrentState() {
    if (currentState == null) {
      final Object defaultVariable = context
          .getVariable(ISources.ACTIVE_CURRENT_SELECTION_NAME);
      final IEvaluationContext contextWithDefaultVariable;
      if (defaultVariable instanceof IStructuredSelection) {
        final IStructuredSelection selection = (IStructuredSelection) defaultVariable;
        contextWithDefaultVariable = new EvaluationContext(context,
            selection.toList());
      } else if ((defaultVariable instanceof ISelection)

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