Examples of org.eclipse.core.commands.IHandler

org.eclipse.core.commands.IHandler
A handler is the pluggable piece of a command that handles execution. Each command can have zero or more handlers associated with it (in general), of which only one will be active at any given moment in time. When the command is asked to execute, it will simply pass that request on to its active handler, if any. @see AbstractHandler @since 3.1

          warningsToLog);
      if (enabledWhenExpression == ERROR_EXPRESSION) {
        continue;
      }


      final IHandler proxy = new HandlerProxy(configurationElement,
          ATT_CLASS, enabledWhenExpression, evaluationService);
      handlerActivations.add(handlerService.activateHandler(commandId,
          proxy, activeWhenExpression));


      // Read out the help context identifier.

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    while (localActivationItr.hasNext()) {
      final Object object = localActivationItr.next();
      if (object instanceof IHandlerActivation) {
        final IHandlerActivation localActivation = (IHandlerActivation) object;
        final String commandId = localActivation.getCommandId();
        final IHandler handler = localActivation.getHandler();
        final IHandlerActivation parentActivation = parent
            .activateHandler(commandId, handler, defaultExpression);
        parentActivations.add(parentActivation);
        localActivationsToParentActivations.put(localActivation,
            parentActivation);

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   * 
   * @see org.eclipse.ui.internal.actions.CommandAction#runWithEvent(org.eclipse.swt.widgets.Event)
   */
  public void runWithEvent(Event event) {
    if (partHandler != null) {
      IHandler oldHandler = getParameterizedCommand().getCommand()
          .getHandler();
      try {
        getParameterizedCommand().getCommand().setHandler(partHandler);
        getParameterizedCommand().executeWithChecks(event, appContext);
      } catch (ExecutionException e) {

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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 {

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    service.deactivateHandlers(handlerActivations);
    final Iterator activationItr = handlerActivations.iterator();
    while (activationItr.hasNext()) {
      final IHandlerActivation activation = (IHandlerActivation) activationItr
          .next();
      final IHandler handler = activation.getHandler();
      if (handler != null) {
        handler.dispose();
      }
    }
    handlerActivations.clear();
  }

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  }


  public final IHandlerActivation activateHandler(
      final IHandlerActivation childActivation) {
    final String commandId = childActivation.getCommandId();
    final IHandler handler = childActivation.getHandler();
    final Expression expression = childActivation.getExpression();
    final int depth = childActivation.getDepth() + 1;
    final IHandlerActivation localActivation = new HandlerActivation(
        commandId, handler, expression, depth, this);
    handlerAuthority.activateHandler(localActivation);

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   */
  public final Object executeCommandInContext(
      final ParameterizedCommand command, final Event trigger,
      IEvaluationContext context) throws ExecutionException,
      NotDefinedException, NotEnabledException, NotHandledException {
    IHandler oldHandler = command.getCommand().getHandler();


    IHandler handler = findHandler(command.getId(), context);
    boolean enabled = true;
    if (handler instanceof HandlerProxy) {
      enabled = ((HandlerProxy) handler).getProxyEnabled();
    }

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        if (commandId != null) {
          actionIdByCommandId.put(commandId, actionID);
          // Register this as a handler with the given definition id.
          // the expression gives the setGlobalActionHandler() a
          // priority.
          final IHandler actionHandler = new ActionHandler(handler);
          Expression handlerExpression = EXPRESSION;
          //XXX add new API in next release to avoid down-casting (bug 137091)
          if (this instanceof EditorActionBars) {
            handlerExpression = ((EditorActionBars)this).getHandlerExpression();
          }

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         * 
         * @param action
         *            the action to register.
         */
        private void registerKeybindings(IAction action) {
            final IHandler handler = new ActionHandler(action);
            final IHandlerService handlerService = (IHandlerService) PlatformUI
                    .getWorkbench().getAdapter(IHandlerService.class);
            final IHandlerActivation activation = handlerService.activateHandler(
                    action.getActionDefinitionId(), handler);
//                    new ActiveShellExpression(dialog.getShell()),

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  private void activateHandler() {
    IHandlerService handlerService= (IHandlerService)PlatformUI.getWorkbench().getAdapter(IHandlerService.class);
    if (handlerService == null)
      return;
    
    IHandler handler= new AbstractHandler() {
      public Object execute(ExecutionEvent event) throws ExecutionException {
        if (ContentAssistHandler.this.isEnabled()) // don't call AbstractHandler#isEnabled()!
          fContentAssistant.showPossibleCompletions();
        return null;
      }

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