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

   * Listens to changes to one or more commands, and forwards them out through
   * the property change event mechanism.
   */
  private final class CommandListener implements ICommandListener {
    public final void commandChanged(final CommandEvent commandEvent) {
      final Command baseCommand = commandEvent.getCommand();


      // Check if the name changed.
      if (commandEvent.isNameChanged()) {
        String newName = null;
        if (baseCommand.isDefined()) {
          try {
            newName = baseCommand.getName();
          } catch (final NotDefinedException e) {
            // Not defined, so leave as null.
          }
        }
        firePropertyChange(IAction.TEXT, null, newName);
      }


      // Check if the description changed.
      if (commandEvent.isDescriptionChanged()) {
        String newDescription = null;
        if (baseCommand.isDefined()) {
          try {
            newDescription = baseCommand.getDescription();
          } catch (final NotDefinedException e) {
            // Not defined, so leave as null.
          }
        }
        firePropertyChange(IAction.DESCRIPTION, null, newDescription);
        firePropertyChange(IAction.TOOL_TIP_TEXT, null, newDescription);
      }


      // Check if the handled property changed.
      if (commandEvent.isHandledChanged()) {
        if (baseCommand.isHandled()) {
          firePropertyChange(IAction.HANDLED, Boolean.FALSE,
              Boolean.TRUE);
        } else {
          firePropertyChange(IAction.HANDLED, Boolean.TRUE,
              Boolean.FALSE);

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      Map commandsByName = new HashMap();


      for (Iterator iterator = commandService.getDefinedCommandIds()
          .iterator(); iterator.hasNext();) {
        Command command = commandService.getCommand((String) iterator
            .next());
        if (!isActive(command)) {
          continue;
        }


        try {
          String name = command.getName();
          Collection commands = (Collection) commandsByName.get(name);


          if (commands == null) {
            commands = new HashSet();
            commandsByName.put(name, commands);
          }


          commands.add(command);
        } catch (NotDefinedException eNotDefined) {
          // Do nothing
        }
      }
      
      // moved here to allow us to remove any empty categories
      commandIdsByCategoryId = new HashMap();


      for (Iterator iterator = commandService.getDefinedCommandIds()
          .iterator(); iterator.hasNext();) {
        final Command command = commandService
            .getCommand((String) iterator.next());
        if (!isActive(command)) {
          continue;
        }


        try {
          String categoryId = command.getCategory().getId();
          Collection commandIds = (Collection) commandIdsByCategoryId
              .get(categoryId);


          if (commandIds == null) {
            commandIds = new HashSet();
            commandIdsByCategoryId.put(categoryId, commandIds);
          }


          commandIds.add(command.getId());
        } catch (NotDefinedException eNotDefined) {
          // Do nothing
        }
      }

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     */
    List commands = new ArrayList();
    final Iterator commandIdItr = commandIds.iterator();
    while (commandIdItr.hasNext()) {
      final String currentCommandId = (String) commandIdItr.next();
      final Command currentCommand = commandService
          .getCommand(currentCommandId);
      try {
        commands.addAll(ParameterizedCommand
            .generateCombinations(currentCommand));
      } catch (final NotDefinedException e) {

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      final Binding binding = (Binding) bindingItr.next();
      final Context context = contextService.getContext(binding
          .getContextId());
      final ParameterizedCommand parameterizedCommand = binding
          .getParameterizedCommand();
      final Command command = parameterizedCommand.getCommand();
      if ((!context.isDefined()) && (!command.isDefined())) {
        continue;
      }


      final TableItem tableItem = new TableItem(
          tableBindingsForTriggerSequence, SWT.NULL);

View Full Code Here


        /*
         * Get the category name, command name, formatted key sequence
         * and context name for the first binding.
         */
        final Command command1 = binding1.getParameterizedCommand()
            .getCommand();
        String categoryName1 = Util.ZERO_LENGTH_STRING;
        String commandName1 = Util.ZERO_LENGTH_STRING;
        try {
          commandName1 = command1.getName();
          categoryName1 = command1.getCategory().getName();
        } catch (final NotDefinedException e) {
          // Just use the zero-length string.
        }
        final String triggerSequence1 = binding1.getTriggerSequence()
            .format();
        final String contextId1 = binding1.getContextId();
        String contextName1 = Util.ZERO_LENGTH_STRING;
        if (contextId1 != null) {
          final Context context = contextService
              .getContext(contextId1);
          try {
            contextName1 = context.getName();
          } catch (final org.eclipse.core.commands.common.NotDefinedException e) {
            // Just use the zero-length string.
          }
        }


        /*
         * Get the category name, command name, formatted key sequence
         * and context name for the first binding.
         */
        final Command command2 = binding2.getParameterizedCommand()
            .getCommand();
        String categoryName2 = Util.ZERO_LENGTH_STRING;
        String commandName2 = Util.ZERO_LENGTH_STRING;
        try {
          commandName2 = command2.getName();
          categoryName2 = command2.getCategory().getName();
        } catch (final org.eclipse.core.commands.common.NotDefinedException e) {
          // Just use the zero-length string.
        }
        final String keySequence2 = binding2.getTriggerSequence()
            .format();

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        // Read out the command id.
        String commandId = readOptional(memento, ATT_COMMAND_ID);
        if (commandId == null) {
          commandId = readOptional(memento, ATT_COMMAND);
        }
        final Command command;
        if (commandId != null) {
          command = commandService.getCommand(commandId);
        } else {
          command = null;
        }

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        commandId = configurationElement.getAttribute(ATT_COMMAND);
      }
      if ((commandId != null) && (commandId.length() == 0)) {
        commandId = null;
      }
      final Command command;
      if (commandId != null) {
        command = commandService.getCommand(commandId);
        if (!command.isDefined()) {
          // Reference to an undefined command. This is invalid.
          addWarning(warningsToLog,
              "Cannot bind to an undefined command", //$NON-NLS-1$
              configurationElement, commandId);
          continue;

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  }


  public final Object executeCommand(final String commandId,
      final Event trigger) throws ExecutionException,
      NotDefinedException, NotEnabledException, NotHandledException {
    final Command command = commandService.getCommand(commandId);
    final ExecutionEvent event = new ExecutionEvent(command,
        Collections.EMPTY_MAP, trigger, getCurrentState());
    return command.executeWithChecks(event);
  }

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    if (commandId == null) {
      WorkbenchPlugin.log("Unable to create menu item \"" + getId() //$NON-NLS-1$
          + "\", no command id"); //$NON-NLS-1$
      return;
    }
    Command cmd = commandService.getCommand(commandId);
    if (!cmd.isDefined()) {
      WorkbenchPlugin.log("Unable to create menu item \"" + getId() //$NON-NLS-1$
          + "\", command \"" + commandId + "\" not defined"); //$NON-NLS-1$ //$NON-NLS-2$
      return;
    }


    if (parameters == null || parameters.size() == 0) {
      command = new ParameterizedCommand(cmd, null);
      return;
    }


    try {
      ArrayList parmList = new ArrayList();
      Iterator i = parameters.entrySet().iterator();
      while (i.hasNext()) {
        Map.Entry entry = (Map.Entry) i.next();
        String parmName = (String) entry.getKey();
        IParameter parm;
        parm = cmd.getParameter(parmName);
        if (parm == null) {
          WorkbenchPlugin
              .log("Unable to create menu item \"" + getId() //$NON-NLS-1$
                  + "\", parameter \"" + parmName + "\" for command \"" //$NON-NLS-1$ //$NON-NLS-2$
                  + commandId + "\" is not defined"); //$NON-NLS-1$

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      final Collection commandIds = commandService.getDefinedCommandIds();
      final Collection commands = new HashSet();
      final Iterator commandIdItr = commandIds.iterator();
      while (commandIdItr.hasNext()) {
        final String currentCommandId = (String) commandIdItr.next();
        final Command currentCommand = commandService
            .getCommand(currentCommandId);
        try {
          commands.addAll(ParameterizedCommand
              .generateCombinations(currentCommand));
        } catch (final NotDefinedException e) {

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