rcp（插件開發）Command 傳值的問題

有這樣一個需求：如果想在command執行的時候攜帶一些信息，然後還想獲取這些信息 這個如何實現呢？

一 傳值部分(傳遞的是ExecutionEvent，通過ExecutionEvent攜帶的ApplicationContext傳遞對象，還可以傳遞別的類型如MAP)

//獲取ICommandService

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

//調用Command並傳遞對象

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

二 取值部分 這個是在command相關聯的handler裡取到這個ExecutionEvent，ExecutionEvent裡攜帶相關傳入的信息。

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;
}
}