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


      // Read out the help context identifier.
      final String helpContextId = readOptional(configurationElement,
          ATT_HELP_CONTEXT_ID);


      final Command command = commandService.getCommand(commandId);
      final Category category = commandService.getCategory(categoryId);
      if (!category.isDefined()) {
        addWarning(
            warningsToLog,
            "Commands should really have a category", //$NON-NLS-1$
            configurationElement, commandId,
            "categoryId", categoryId); //$NON-NLS-1$
      }


      final ParameterType returnType;
      if (returnTypeId == null) {
        returnType = null;
      } else {
        returnType = commandService.getParameterType(returnTypeId);
      }


      command.define(name, description, category, parameters, returnType,
          helpContextId);
      readState(configurationElement, warningsToLog, command);
    }


    // If there were any warnings, then log them now.

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   * @param commandService 
   * @param makeFast
   */
  private ParameterizedCommand getCommand(ICommandService commandService,
      final boolean makeFast) {
    Command c = commandService.getCommand(SHOW_VIEW_ID);
    Parameterization[] parms = null;
    if (makeFast) {
      try {
        IParameter parmDef = c.getParameter(PARAMETER_MAKE_FAST);
        parms = new Parameterization[] { 
            new Parameterization(parmDef, "true") //$NON-NLS-1$
        };
      } catch (NotDefinedException e) {
        // this should never happen

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     * All state on all commands neeeds to be disposed. This is so that the
     * state has a chance to persist any changes.
     */
    final Command[] commands = commandManager.getAllCommands();
    for (int i = 0; i < commands.length; i++) {
      final Command command = commands[i];
      final String[] stateIds = command.getStateIds();
      for (int j = 0; j < stateIds.length; j++) {
        final String stateId = stateIds[j];
        final State state = command.getState(stateId);
        if (state instanceof PersistentState) {
          final PersistentState persistentState = (PersistentState) state;
          if (persistentState.shouldPersist()) {
            persistentState.save(PrefUtil
                .getInternalPreferenceStore(),

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    return commandManager.getHelpContextId(command);
  }


  public final String getHelpContextId(final String commandId)
      throws NotDefinedException {
    final Command command = getCommand(commandId);
    return commandManager.getHelpContextId(command);
  }

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   * 
   * @see org.eclipse.ui.commands.ICommandService#refreshElements(java.lang.String,
   *      java.util.Map)
   */
  public final void refreshElements(String commandId, Map filter) {
    Command cmd = getCommand(commandId);


    if (!cmd.isDefined() || !(cmd.getHandler() instanceof IElementUpdater)) {
      return;
    }
    final IElementUpdater updater = (IElementUpdater) cmd.getHandler();


    if (commandCallbacks == null) {
      return;
    }

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    }
    parameterizedCommands.add(elementReference);


    // If the active handler wants to update the callback, it can do
    // so now
    Command command = getCommand(elementReference.getCommandId());
    if (command.isDefined()) {
      if (command.getHandler() instanceof IElementUpdater) {
        ((IElementUpdater) command.getHandler()).updateElement(
            elementReference.getElement(), elementReference
                .getParameters());
      }
    }
  }

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    // return new CategoryWrapper(commandManager.getCategory(categoryId));
    return null;
  }


  public ICommand getCommand(String commandId) {
    final Command command = commandManager.getCommand(commandId);
    return new CommandLegacyWrapper(command, bindingManager);
  }

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  /* (non-Javadoc)
   * @see org.eclipse.ui.internal.CycleBaseHandler#getBackwardCommand()
   */
  protected ParameterizedCommand getBackwardCommand() {
    final ICommandService commandService = (ICommandService) window.getWorkbench().getService(ICommandService.class);
    final Command command = commandService.getCommand("org.eclipse.ui.window.previousEditor"); //$NON-NLS-1$
    ParameterizedCommand commandBack = new ParameterizedCommand(command, null);
    return commandBack;
  }

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  /* (non-Javadoc)
   * @see org.eclipse.ui.internal.CycleBaseHandler#getForwardCommand()
   */
  protected ParameterizedCommand getForwardCommand() {
    final ICommandService commandService = (ICommandService) window.getWorkbench().getService(ICommandService.class);
    final Command command = commandService.getCommand("org.eclipse.ui.window.nextEditor"); //$NON-NLS-1$
    ParameterizedCommand commandF = new ParameterizedCommand(command, null);
    return commandF;
  }

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     */
    public void setCommandHandlers( ICommandService service ) {


        if (!handlersSet) {
            if (commandId != null) {
                Command command = service.getCommand(commandId);
                if (command != null && getHandler() != null)
                    command.setHandler(getHandler());
            }
            handlersSet = true;
        }
    }

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