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

      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

    {
      getLogFacility().logWarning(
          "Current application context is not an IEvaluationContext.");
      return null;
    }
    IEvaluationContext appContext = (IEvaluationContext) applicationContext;
    ISelection selection = (ISelection) appContext
        .getVariable(ISources.ACTIVE_CURRENT_SELECTION_NAME);
    if (selection == null)
    {
      getLogFacility().logWarning(
          "Current selection is null, no action is taken.");

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Examples of org.eclipse.core.expressions.IEvaluationContext

    {
      getLogFacility().logWarning(
          "Current application context is not an IEvaluationContext.");
      return null;
    }
    IEvaluationContext appContext = (IEvaluationContext) applicationContext;
    ISelection selection = (ISelection) appContext
        .getVariable(ISources.ACTIVE_MENU_SELECTION_NAME);
    if (selection == null && !this.alwaysUseFileOpenedInEditor())
    {
      getLogFacility().logWarning(
          "Current selection is null, no action is taken.");

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Examples of org.eclipse.core.expressions.IEvaluationContext

  }


  @Override
  public void setEnabled(Object evaluationContext) {
    if (evaluationContext instanceof IEvaluationContext) {
      IEvaluationContext ctx = (IEvaluationContext) evaluationContext;
      Repository repo = SelectionUtils.getRepository(ctx);
      if (repo != null) {
        boolean enabled = isEnabledForState(repo,
            repo.getRepositoryState());
        setBaseEnabled(enabled);

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Examples of org.eclipse.core.expressions.IEvaluationContext

        workbench, null, itemAction, STYLE_PUSH);


    IWorkbenchWindow activeWorkbenchWindow = workbench
        .getActiveWorkbenchWindow();
    IHandlerService hsr = CommonUtils.getService(activeWorkbenchWindow, IHandlerService.class);
    IEvaluationContext ctx = hsr.getCurrentState();
    ctx.addVariable(ACTIVE_MENU_SELECTION_NAME, getContext().getSelection());


    return new CommandContributionItem(itemParam);
  }

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Examples of org.eclipse.core.expressions.IEvaluationContext


    IHandlerService handlerService = CommonUtils.getService(serviceLocator, IHandlerService.class);
    if (handlerService == null)
      return null;


    IEvaluationContext evaluationContext = handlerService.getCurrentState();
    return SelectionUtils.getRepository(evaluationContext);
  }

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Examples of org.eclipse.core.expressions.IEvaluationContext


    return StructuredSelection.EMPTY;
  }


  private static IEvaluationContext getEvaluationContext() {
    IEvaluationContext ctx;
    IWorkbenchWindow activeWorkbenchWindow = PlatformUI.getWorkbench()
        .getActiveWorkbenchWindow();
    // no active window during Eclipse shutdown
    if (activeWorkbenchWindow == null)
      return null;

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Examples of org.eclipse.core.expressions.IEvaluationContext

   * @param selectionListener
   */
  public static void notifySelectionChangedWithCurrentSelection(
      ISelectionListener selectionListener, IServiceLocator serviceLocator) {
    IHandlerService handlerService = CommonUtils.getService(serviceLocator, IHandlerService.class);
    IEvaluationContext state = handlerService.getCurrentState();
    // This seems to be the most reliable way to get the active part, it
    // also returns a part when it is called while creating a view that is
    // being shown.Getting the active part through the active workbench
    // window returned null in that case.
    Object partObject = state.getVariable(ISources.ACTIVE_PART_NAME);
    Object selectionObject = state
        .getVariable(ISources.ACTIVE_CURRENT_SELECTION_NAME);
    if (partObject instanceof IWorkbenchPart
        && selectionObject instanceof ISelection) {
      IWorkbenchPart part = (IWorkbenchPart) partObject;
      ISelection selection = (ISelection) selectionObject;

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Examples of org.eclipse.core.expressions.IEvaluationContext

    Object result;      
    String rawSerialization = command.getSerialization();
    try {
      String substitutedSerialization = csm.performVariableSubstitution(rawSerialization);
      selectedCommand = commandService.deserialize(substitutedSerialization);
      IEvaluationContext state = handlerService.getCurrentState();
      result = selectedCommand.executeWithChecks(null, state);
      
      String returnsAttribute = command.getReturns();
      if ((returnsAttribute != null) && (result != null)) {
        ParameterType returnType = selectedCommand.getCommand().getReturnType();

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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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