如何在命令中传递对象参数？

本文介绍了如何在命令中传递对象参数？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我创建了一个带有参数的新命令的eclipse-rcp项目的plugin.xml。

I created an eclipse-rcp's project's plugin.xml with a new command with a parameter.

ArrayList<parameterization> parameters = new ArrayList<parameterization>(); IParameter iparam; //get the command from plugin.xml IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow(); ICommandService cmdService = (ICommandService)window.getService(ICommandService.class); Command cmd = cmdService.getCommand("org.ipiel.demomands.click"); //get the parameter iparam = cmd.getParameter("org.ipiel.demomands.click.paramenter1"); Parameterization params = new Parameterization(iparam, "commandValue"); parameters.add(params); //build the parameterized command ParameterizedCommand pc = new ParameterizedCommand(cmd, parameters.toArray(new Parameterization[parameters.size()])); //execute the command IHandlerService handlerService = (IHandlerService)window.getService(IHandlerService.class); handlerService.executeCommand(pc, null);

我试过这个例子传递参数和它的工作。

I tried this example to pass parameters and it worked.

这个例子中的问题只能传递String类型的参数。 （因为参数化）

The issue in this example that I could pass only parameters of type String. ( because Parameterization )

我想传递哈希映射的参数，一般来说传递任何对象。

I want to pass parameter of hash map and in general to pass any object.

我试过这个代码

IServiceLocator serviceLocator = PlatformUI.getWorkbench(); ICommandService commandService = (ICommandService) serviceLocator.getService(ICommandService.class); ExecutionEvent executionEvent = new ExecutionEvent(cmd, paramArray, null, null); cmd.executeWithChecks(executionEvent);

但它没有工作，参数没有移动（它是null）

but it didn't work the parameters didn't move ( it was null)

你可以帮助将对象作为参数移动到命令中吗？

Could you please help to to move object as parameter in command ?

推荐答案

这会让我感到困惑，为我的第一个答案添加另一个解决方案，我将提供另一个解决方案。 我给出的选择是A使用执行事件的选定对象（检查它包含很多信息）B）可以使用AbstractSourceProvider，以便将对象传递给应用程序上下文。

Since it would get confusing to add another solution to my first answer, I'll provide another one for a second solution. The choices I gave were " A) use the selected object of the "Execution Event" (examine that, it contains a lot of infos). B) you can use AbstractSourceProvider, so you can pass your object to the application context."

A）可以在您的处理程序中使用，如果您的对象是像树一样的结构化对象的选择：

A) can be used in your Handler if your object is the selection of a Structured Object like a Tree:

MyObject p = (MyObject) ((IStructuredSelection) HandlerUtil.getCurrentSelection(event)).getFirstElement();

B）源提供者的使用有点棘手。主要的想法是，您将对象添加到应用程序上下文中。从我在阅读此博客之后设置的项目中，Eclipse 3.x的重要片段（注意：它是在德国，它提供的示例不起作用）：在您的plugin.xml中添加：

B) The usage of a Source provider is a bit more tricky. The main idea is, that you add your object to the application context. The important snippets for Eclipse 3.x from a project that I set up after I read this blog (note: it is in german and the example it provides doesn't work): In your plugin.xml add:

<extension point="org.eclipse.ui.services"> <sourceProvider provider="com.voo.example.sourceprovider.PersonSourceProvider"> <variable name="com.voo.example.sourceprovider.currentPerson" priorityLevel="activePartId"> </variable> </sourceProvider>

设置自己的SourceProvider。调用getCurrentState，您可以获取该SourceProvider的变量（您的 Person 对象）：

Set up your own SourceProvider. Calling the "getCurrentState" you can get the variable (your Person object in this case) of that SourceProvider:

public class PersonSourceProvider extends AbstractSourceProvider{ /** This is the variable that is used as reference to the SourceProvider */ public static final String PERSON_ID = "com.voo.example.sourceprovider.currentPerson"; private Person currentPerson; public PersonSourceProvider() { } @Override public void dispose() { currentPerson = null; } **/** * Used to get the Status of the source from the framework */ @Override public Map<String, Person> getCurrentState() { Map<String, Person> personMap = new HashMap<String, Person>(); personMap.put(PERSON_ID, currentPerson); return personMap; }** @Override public String[] getProvidedSourceNames() { return new String[]{PERSON_ID}; } public void personChanged(Person p){ if (this.currentPerson != null && this.currentPerson.equals(p)){ return; } this.currentPerson = p; fireSourceChanged(ISources.ACTIVE_PART_ID, PERSON_ID, this.currentPerson); }

}

在您的视图中，您注册到SourceProvider并将对象设置为要传输到您的处理程序的对象。

In your View you register to the SourceProvider and set the Object to the object you want to transfer to your Handler.

public void createPartControl(Composite parent) { viewer = new TreeViewer(parent); viewer.setLabelProvider(new ViewLabelProvider()); viewer.setContentProvider(new ViewContentProvider()); viewer.setInput(rootPerson); getSite().setSelectionProvider(viewer); viewer.addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { Person p = null; if (event.getSelection() instanceof TreeSelection) { TreeSelection selection = (TreeSelection) event.getSelection(); if (selection.getFirstElement() instanceof Person) { p = (Person) selection.getFirstElement(); } } if (p==null) { return; } IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow(); ISourceProviderService service = (ISourceProviderService) window.getService(ISourceProviderService.class); PersonSourceProvider sourceProvider = (PersonSourceProvider) service.getSourceProvider(PersonSourceProvider.PERSON_ID); sourceProvider.personChanged(p); } }); }

在你的处理程序中，你可以调用PersonSourceProvider＃getCurrentState获取对象

And in your Handler you can just call the PersonSourceProvider#getCurrentState to get your Objects back.

这种方法的优点是可以在任何地方使用Objectd。例如。您甚至可以设置一个PropertyTester以根据当前选定的对象启用/禁用UI元素。

Advantage of this method is, that you can use the Objectd anywhere you want. E.g. you can even set up a PropertyTester to enable/disable UI elements according to the currently selected Object.