如何在Eclipse 4.3中使用ParameterizedCommand注入参数？ [英] How to inject parameter with ParameterizedCommand in Eclipse 4.3?

问题描述

我当前正在实现Eclipse 4.3应用程序并遇到问题。我尝试参数化命令以删除特定文件。我的方法对应于在Eclipse中获取参数化命令的参数RCP 4.2 ，但是我莫名其妙地无法正常工作。

I am currently implementing an Eclipse 4.3 application and running into a problem. I try to parametrize a command to delete specific files. My approach is corresponding to Getting parameter of parameterized command in Eclipse RCP 4.2, but i somehow don't get it working right.

在我的Application.e4xmi中，我添加了带有参数的命令：

In my Application.e4xmi I have added a command with a parameter:

<commands xmi:id="_K1MVgDGKEeOO8o2ChqdHMA" elementId="first.application.command.deleteproject" commandName="deleteProjectCommand">
<parameters xmi:id="_Hr4FEDGTEeOO8o2ChqdHMA" elementId="cmd0" name="cmd0" typeId="" optional="false"/>
</commands>

在代码的某一点上，我创建了命令，设置了参数，然后执行它：

At one point in my code I create the command, set the parameter, and execute it:

Map<String, String> parameters = new HashMap<String, String>();
parameters.put("cmd0", "test");
final Command command =commandService.getCommand("first.application.command.deleteproject");
final ParameterizedCommand pcmd = ParameterizedCommand.generateCommand(command, parameters);
pcmd.executeWithChecks(null, null);

我有一个与命令链接的处理程序，具有以下执行方法：

I have a handler that is linked with the command, that has the following execute method:

@Execute
public void execute(@Optional @Named("cmd0") String file) {
  System.out.println("delete project " + file);
}

一切正常，只有文件未注入，它保持为 null 。当我在执行前检查 pcmd 变量时，它告诉我已将参数正确设置为 {cmd0 = test} （使用 System.out.println（pcmd.getParameterMap（））; ）。当我删除 @Optional 时，根本不会调用execute方法。

Everything works fine, only the file is not injected, it stays null. When I check the pcmd variable before I execute it, it tells me that it has set the parameters correctly to {cmd0=test} (using System.out.println(pcmd.getParameterMap());). When I remove @Optional, the execute method is not called at all.

在某些地方参数 cmd0 丢失。

Somewhere the parameter cmd0 is lost. Where is the mistake in my code?

谢谢！

推荐答案

刚刚找到解决方案。使用 pcmd.executeWithChecks（null，null）; 执行似乎无法正常工作。相反，我们需要注入的 EHandlerService ：

Just found the solution. Executing with pcmd.executeWithChecks(null, null); seems not to work as expected. Instead, we need the EHandlerService that we inject:

@Inject
private EHandlerService handlerService;

现在，我们使用如下服务执行命令：

And now we execute the command with the service like this:

handlerService.executeHandler(pcmd);

Voila！

我希望这可以也可以帮助别人。

I hope this can help someone, too.

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