Examples of 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
org.eclipse.jdt.core.eval.IEvaluationContext
An evaluation context supports evaluating code snippets.
A code snippet is pretty much any valid piece of Java code that could be pasted into the body of a method and compiled. However, there are two areas where the rules are slightly more liberal.
First, a code snippet can return heterogeneous types. Inside the same code snippet an int could be returned on one line, and a String on the next, etc. For example, the following would be considered a valid code snippet:
```
  char c = '3'; switch (c) { case '1': return 1; case '2': return '2'; case '3': return "3"; default: return null; }  
```
Second, if the last statement is only an expression, the return keyword is implied. For example, the following returns false:
```
  int i = 1; i == 2  
```
Global variables are an additional feature of evaluation contexts. Within an evaluation context, global variables maintain their value across evaluations. These variables are particularly useful for storing the result of an evaluation for use in subsequent evaluations.

The evaluation context remembers the name of the package in which code snippets are run. The user can set this to any package, thereby gaining access to types that are normally only visible within that package.

Finally, the evaluation context remembers a list of import declarations. The user can import any packages and types so that the code snippets may refer to types by their shorter simple names.

Example of use:
```
  IJavaProject project = getJavaProject(); IEvaluationContext context = project.newEvaluationContext(); String codeSnippet = "int i= 0; i++"; ICodeSnippetRequestor requestor = ...; context.evaluateCodeSnippet(codeSnippet, requestor, progressMonitor);  
```
IJavaProject.newEvaluationContext can be used to obtain an instance.
@see IJavaProject#newEvaluationContext() @noimplement This interface is not intended to be implemented by clients.
org.eclipse.xtext.xbase.interpreter.IEvaluationContext

Examples of org.eclipse.core.expressions.IEvaluationContext


  @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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Examples of org.eclipse.core.expressions.IEvaluationContext

  
  @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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Examples of org.eclipse.core.expressions.IEvaluationContext

  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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Examples of org.eclipse.core.expressions.IEvaluationContext

      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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Examples of org.eclipse.core.expressions.IEvaluationContext

  }


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

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Examples of org.eclipse.core.expressions.IEvaluationContext

{
  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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Examples of org.eclipse.core.expressions.IEvaluationContext

      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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Examples of org.eclipse.core.expressions.IEvaluationContext

          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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Examples of org.eclipse.core.expressions.IEvaluationContext

   *            <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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Examples of org.eclipse.core.expressions.IEvaluationContext

   */
  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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