Examples of org.eclipse.core.commands.Command

org.eclipse.core.commands.Command

A command is an abstract representation for some semantic behaviour. It is not the actual implementation of this behaviour, nor is it the visual appearance of this behaviour in the user interface. Instead, it is a bridge between the two.

The concept of a command is based on the command design pattern. The notable difference is how the command delegates responsibility for execution. Rather than allowing concrete subclasses, it uses a handler mechanism (see the handlers extension point). This provides another level of indirection.

A command will exist in two states: defined and undefined. A command is defined if it is declared in the XML of a resolved plug-in. If the plug-in is unloaded or the command is simply not declared, then it is undefined. Trying to reference an undefined command will succeed, but trying to access any of its functionality will fail with a NotDefinedException. If you need to know when a command changes from defined to undefined (or vice versa), then attach a command listener.

Commands are mutable and will change as their definition changes.
@since 3.1

        if (input == null || !input.isSingleFile())
          return;


        ICommandService srv = CommonUtils.getService(site, ICommandService.class);
        IHandlerService hsrv = CommonUtils.getService(site, IHandlerService.class);
        Command cmd = srv.getCommand(HistoryViewCommands.SHOWVERSIONS);
        Parameterization[] parms;
        if (Activator.getDefault().getPreferenceStore().getBoolean(
            UIPreferences.RESOURCEHISTORY_COMPARE_MODE))
          try {
            IParameter parm = cmd
                .getParameter(HistoryViewCommands.COMPARE_MODE_PARAM);
            parms = new Parameterization[] { new Parameterization(
                parm, Boolean.TRUE.toString()) };
          } catch (NotDefinedException e) {
            Activator.handleError(e.getMessage(), e, true);

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   */
  public static boolean runCommand(String commandId,
      IStructuredSelection selection) {
    ICommandService commandService = CommonUtils.getService(PlatformUI
        .getWorkbench(), ICommandService.class);
    Command cmd = commandService.getCommand(commandId);
    if (!cmd.isDefined())
      return false;


    IHandlerService handlerService = CommonUtils.getService(PlatformUI
        .getWorkbench(), IHandlerService.class);
    EvaluationContext c = null;

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public class HighlightLayerActionHandler extends MapEditorActionHandler {


  @Override
  public void executeForEditor(ExecutionEvent event, MapEditor activeEditor) {
    Command command = event.getCommand();
    State state = command.getState("STYLE");
    state.setValue(!(Boolean) state.getValue());
    activeEditor.setHighlightCurrentLayer((Boolean) state.getValue());
  }

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 * Implements "Link With Selection" toggle
 */
public class LinkWithSelectionCommand extends
    RepositoriesViewCommandHandler<RepositoryTreeNode> {
  public Object execute(final ExecutionEvent event) throws ExecutionException {
    Command command = event.getCommand();
    HandlerUtil.toggleCommandState(command);
    @SuppressWarnings("boxing")
    boolean test = (Boolean) command.getState(RegistryToggleState.STATE_ID).getValue();
    getView(event).setReactOnSelection(test);
    return null;
  }

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    if (commandService == null)
      return;


    /* Define Command For Each Label */
    for (final ILabel label : labels) {
      Command command = commandService.getCommand(LABEL_ACTION_PREFIX + label.getOrder());
      command.define(NLS.bind(Messages.Controller_LABEL, label.getName()), NLS.bind(Messages.Controller_LABEL_MSG, label.getName()), commandService.getCategory(RSSOWL_KEYBINDING_CATEGORY));
      command.setHandler(new LabelNewsHandler(label));
    }
  }

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    if (commandService == null)
      return;


    /* Define Command For Each Share Provider */
    for (final ShareProvider provider : shareProviders) {
      Command command = commandService.getCommand(provider.getId());
      command.define(NLS.bind(Messages.Controller_SHARE, provider.getName()), NLS.bind(Messages.Controller_SHARE_MSG, provider.getName()), commandService.getCategory(RSSOWL_KEYBINDING_CATEGORY));
      command.setHandler(new ShareNewsHandler(provider));
    }
  }

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    private void executeCommand(String command, String... parameters)
    {
        try
        {
            Command cmd = commandService.getCommand(command);


            List<Parameterization> parameterizations = new ArrayList<Parameterization>();
            if (parameters != null)
            {
                for (int ii = 0; ii < parameters.length; ii++)
                {
                    IParameter p = cmd.getParameter(parameters[ii]);
                    parameterizations.add(new Parameterization(p, parameters[++ii]));
                }
            }


            ParameterizedCommand pCmd = new ParameterizedCommand(cmd,

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        return null;
    }


    private void executeCommand(String command)
    {
        Command cmd = commandService.getCommand(command);
        ParameterizedCommand pCmd = new ParameterizedCommand(cmd, null);
        if (handlerService.canExecute(pCmd))
        {
            handlerService.executeHandler(pCmd);
        }

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        final Iterator listenerItr = registeredListeners.entrySet()
            .iterator();
        while (listenerItr.hasNext()) {
          final Map.Entry entry = (Map.Entry) listenerItr.next();
          final String commandId = (String) entry.getKey();
          final Command command = commandManager
              .getCommand(commandId);
          final ParameterizedCommand parameterizedCommand = new ParameterizedCommand(
              command, null);
          if (event.isActiveBindingsChangedFor(parameterizedCommand)) {
            final IPropertyChangeListener listener = (IPropertyChangeListener) entry

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     * Calling this method with an undefined command id will generate a log
     * message.
     */
    public final boolean isActive(final String commandId) {
      if (commandId != null) {
        final Command command = commandManager.getCommand(commandId);


        if (!command.isDefined()
            && (!loggedCommandIds.contains(commandId))) {
          // The command is not yet defined, so we should log this.
          final String message = MessageFormat.format(Util
              .translateString(RESOURCE_BUNDLE,
                  "undefinedCommand.WarningMessage", null), //$NON-NLS-1$
              new String[] { command.getId() });
          IStatus status = new Status(IStatus.ERROR,
              "org.eclipse.jface", //$NON-NLS-1$
              0, message, new Exception());
          Policy.getLog().log(status);


          // And remember this item so we don't log it again.
          loggedCommandIds.add(commandId);
          command.addCommandListener(new ICommandListener() {
            /*
             * (non-Javadoc)
             * 
             * @see org.eclipse.ui.commands.ICommandListener#commandChanged(org.eclipse.ui.commands.CommandEvent)
             */
            public final void commandChanged(
                final CommandEvent commandEvent) {
              if (command.isDefined()) {
                command.removeCommandListener(this);
                loggedCommandIds.remove(commandId);
              }
            }
          });

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