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

    {
        IHandlerService handlerService = ( IHandlerService ) PlatformUI.getWorkbench().getAdapter(
            IHandlerService.class );
        if ( handlerService != null )
        {
            IHandler handler = new org.eclipse.core.commands.AbstractHandler()
            {
                public Object execute( ExecutionEvent event ) throws org.eclipse.core.commands.ExecutionException
                {
                    showPossibleCompletions();
                    return null;

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    {
        ICommandService commandService = ( ICommandService ) PlatformUI.getWorkbench().getAdapter(
            ICommandService.class );
        if ( commandService != null )
        {
            IHandler handler = commandService.getCommand( action.getActionDefinitionId() ).getHandler();
            if ( handler instanceof ActionHandler )
            {
                ActionHandler actionHandler = ( ActionHandler ) handler;
                if ( actionHandler != null && actionHandler.getAction() == action )
                {

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    {
        IHandlerService handlerService = ( IHandlerService ) PlatformUI.getWorkbench().getAdapter(
            IHandlerService.class );
        if ( handlerService != null )
        {
            IHandler handler = new org.eclipse.core.commands.AbstractHandler()
            {
                public Object execute( ExecutionEvent event ) throws org.eclipse.core.commands.ExecutionException
                {
                    showPossibleCompletions();
                    return null;

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      if(handlerActivation != null) {
        handlerService.deactivateHandler(handlerActivation);
        handlerActivation = null;
      }
      IHandler handler = getHandler(textEditor);
      if(handler != null) {
        handlerActivation = handlerService.activateHandler(commandId, handler);
      }
    }

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      final Expression expression = new ActiveShellExpression(shell);
      for (Iterator iterator = handlersByCommandId.entrySet().iterator(); iterator
          .hasNext();) {
        Map.Entry entry = (Map.Entry) iterator.next();
        String commandId = (String) entry.getKey();
        IHandler handler = (IHandler) entry.getValue();
        newHandlers.add(handlerService.activateHandler(commandId,
            handler, expression));
      }
    }

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   */
  public final IHandler getHandler(String commandId) {
    if (fHandlers == null)
      throw new IllegalStateException();


    IHandler handler= (IHandler)fHandlers.get(commandId);
    if (handler != null)
      return handler;


    Assert.isLegal(false);
    return null;

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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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   * @see org.eclipse.jface.text.contentassist.ICompletionListener#assistSessionStarted(org.eclipse.jface.text.contentassist.ContentAssistEvent)
   * @since 3.4
   */
  public void assistSessionStarted(ContentAssistEvent event) {
    ICommandService commandService= (ICommandService)PlatformUI.getWorkbench().getService(ICommandService.class);
    IHandler handler= getHandler(ContentAssistant.SELECT_NEXT_PROPOSAL_COMMAND_ID);
    fReplacedCommands= new ArrayList(10);
    fReplacedCommands.add(new ReplacedCommand(ITextEditorActionDefinitionIds.LINE_DOWN, handler, commandService));
    handler= getHandler(ContentAssistant.SELECT_PREVIOUS_PROPOSAL_COMMAND_ID);
    fReplacedCommands.add(new ReplacedCommand(ITextEditorActionDefinitionIds.LINE_UP, handler, commandService));
    fReplacedCommands.add(new ReplacedCommand(ITextEditorActionDefinitionIds.LINE_START, commandService));

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  }


  private void activateHandler(CommandConfig commandConfig, String commandId)
  {
    IHandlerService handlerService = (IHandlerService) getHandlerService(getServiceLocator());
    IHandler handler = this.createHandlerForCustomCommand(commandConfig);
    IHandlerActivation handlerActivation = handlerService.activateHandler(
        commandId, handler);
    this.setHandlerActivationInCommandConfig(commandConfig, handlerActivation);
  }

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    {
        IHandlerService handlerService = ( IHandlerService ) PlatformUI.getWorkbench().getAdapter(
            IHandlerService.class );
        if ( handlerService != null )
        {
            IHandler handler = new org.eclipse.core.commands.AbstractHandler()
            {
                public Object execute( ExecutionEvent event ) throws org.eclipse.core.commands.ExecutionException
                {
                    showPossibleCompletions();
                    return null;

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