rcp（插件开发）Command 传值的问题

有这样一个需求：如果想在command执行的时候携带一些信息，然后还想获取这些信息 这个如何实现呢？

 

一 传值部分(传递的是ExecutionEvent，通过ExecutionEvent携带的ApplicationContext传递对象，还可以传递别的类型如MAP)

//获取ICommandService

ICommandService commandService = (ICommandService) PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActivePart().getSite().getService(ICommandService.class);

//调用Command并传递对象

commandService.getCommand("CommandId").executeWithChecks(new ExecutionEvent(null, Collections.EMPTY_MAP, null, sendObject));

 

二 取值部分 这个是在command相关联的handler里取到这个ExecutionEvent，ExecutionEvent里携带相关传入的信息。

package command_test.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.jface.dialogs.MessageDialog;

/**
 * Our sample handler extends AbstractHandler, an IHandler base class.
 * @see org.eclipse.core.commands.IHandler
 * @see org.eclipse.core.commands.AbstractHandler
 */
public class SampleHandler extends AbstractHandler {
 /**
  * The constructor.
  */
 public SampleHandler() {
 }

 /**
  * the command has been executed, so extract extract the needed information
  * from the application context.
  */
 public Object execute(ExecutionEvent event) throws ExecutionException {
  IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event);
  MessageDialog.openInformation(
    window.getShell(),
    "Command_Test",
    "Hello, Eclipse world");
  return null;
 }
}