CommandHandler.java

package sk.stuba.fiit.perconik.core.resources;

import org.eclipse.core.commands.Command;
import org.eclipse.swt.widgets.Display;

import sk.stuba.fiit.perconik.core.listeners.CommandListener;
import sk.stuba.fiit.perconik.eclipse.core.commands.Commands;

enum CommandHandler implements Handler<CommandListener> {
  INSTANCE;

  public void register(final CommandListener listener) {
    final Runnable addListener = new Runnable() {
      public void run() {
        for (Command command: Commands.waitForCommandService().getDefinedCommands()) {
          command.addCommandListener(listener);
        }
      }
    };

    Display.getDefault().asyncExec(addListener);
  }

  public void unregister(final CommandListener listener) {
    final Runnable removeListener = new Runnable() {
      public void run() {
        for (Command command: Commands.waitForCommandService().getDefinedCommands()) {
          command.removeCommandListener(listener);
        }
      }
    };

    Display.getDefault().asyncExec(removeListener);
  }
}