Examples of org.eclipse.core.expressions.Expression

org.eclipse.core.expressions.Expression
Abstract base class for all expressions provided by the common expression language.
An expression is evaluated by calling {@link #evaluate(IEvaluationContext)}.

This class may be subclassed to provide specific expressions.
@since 3.0

      return;
    }


    List<IAction> debugActions = getActions(menuService);
    for (IAction action : debugActions) {
      additions.addContributionItem(new ActionContributionItem(action), new Expression() {
        public EvaluationResult evaluate(IEvaluationContext context) {
          return EvaluationResult.TRUE;
        }


        public void collectExpressionInfo(ExpressionInfo info) {

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  /**
   * Initialize the slave services for this site.
   */
  private void initializeDefaultServices() {
    final Expression defaultExpression = new ActivePartExpression(
        multiPageEditor);


    final IHandlerService parentService = (IHandlerService) serviceLocator
        .getService(IHandlerService.class);
    final IHandlerService slave = new NestableHandlerService(parentService,

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   * @see org.eclipse.ui.internal.AbstractEvaluationHandler#getEnabledWhenExpression()
   */
  protected Expression getEnabledWhenExpression() {
    // TODO Auto-generated method stub
    if (enabledWhen == null) {
      enabledWhen = new Expression() {
        public EvaluationResult evaluate(IEvaluationContext context)
            throws CoreException {
          IWorkbenchPart part = InternalHandlerUtil
              .getActivePart(context);
          if (part != null) {

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  /**
   * Initialize the slave services for this site.
   */
  private void initializeDefaultServices() {
    final IWorkbenchPart parentPart = parentSite.getPart();
    final Expression defaultExpression = new ActivePartExpression(
        parentPart);


    final IHandlerService parentService = (IHandlerService) parentSite
        .getService(IHandlerService.class);
    final IHandlerService slave = new NestableHandlerService(parentService,

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          "Handlers need a class", commandId)) { //$NON-NLS-1$
        continue;
      }


      // Get the activeWhen and enabledWhen expressions.
      final Expression activeWhenExpression = readWhenElement(
          configurationElement, TAG_ACTIVE_WHEN, commandId,
          warningsToLog);
      if (activeWhenExpression == ERROR_EXPRESSION) {
        continue;
      }
      final Expression enabledWhenExpression = readWhenElement(
          configurationElement, TAG_ENABLED_WHEN, commandId,
          warningsToLog);
      if (enabledWhenExpression == ERROR_EXPRESSION) {
        continue;
      }

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      buffer.write("\thandler="); //$NON-NLS-1$
      buffer.write(handler==null?"":handler.toString()); //$NON-NLS-1$
      buffer.write(',');
      buffer.newLine();
      buffer.write("\texpression="); //$NON-NLS-1$
      Expression exp = getExpression();
      buffer.write(exp==null?"":exp.toString()); //$NON-NLS-1$
      buffer.write(",sourcePriority="); //$NON-NLS-1$
      buffer.write(Integer.toString(getSourcePriority()));
      buffer.write(')');
      buffer.flush();
    } catch (IOException e) {

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          activationsByExpression = new HashMap(
              ACTIVATIONS_BY_SOURCE_SIZE);
          activationsByExpressionBySourcePriority[i] = activationsByExpression;
        }


        final Expression expression = activation.getExpression();
        Collection activations = (Collection) activationsByExpression
            .get(expression);
        if (activations == null) {
          activations = new HashSet();
          activationsByExpression.put(expression, activations);

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        final Map activationsByExpression = activationsByExpressionBySourcePriority[i];
        if (activationsByExpression == null) {
          continue;
        }


        final Expression expression = activation.getExpression();
        final Collection activations = (Collection) activationsByExpression
            .get(expression);
        activations.remove(activation);
        if (activations.isEmpty()) {
          activationsByExpression.remove(expression);

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   * @throws CoreException
   * @since 3.3
   */
  private boolean eval(IEvaluationContext context,
      IHandlerActivation activation) throws CoreException {
    Expression expression = activation.getExpression();
    if (expression == null) {
      return true;
    }
    return expression.evaluate(context) == EvaluationResult.TRUE;
  }

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  public final IHandlerActivation activateHandler(
      final IHandlerActivation childActivation) {
    final String commandId = childActivation.getCommandId();
    final IHandler handler = childActivation.getHandler();
    final Expression childExpression = childActivation.getExpression();
    final AndExpression expression;
    if (childExpression instanceof AndExpression) {
      expression = (AndExpression) childExpression;
    } else {
      expression = new AndExpression();

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