java - 无法将 Object 或 instanceof 转换为 true 到 IProject || Java Eclipse 插件开发

Question

为什么我无法将对象类型数组(用于获取包资源管理器选择的 Eclipse 框架方法返回的内容)转换为 IProject？ instanceof 返回 false，并且未经检查的强制转换会导致异常。但调试器显示 Object[] 数组的内容，其中包含所有实例变量和 IProject 类型的所有内容:

private List<IProject> getValidSelectedProjects(IWorkbenchWindow window) {
        final ISelectionService service = window.getSelectionService();
        final IStructuredSelection structured = (IStructuredSelection) service.getSelection("org.eclipse.jdt.ui.PackageExplorer");
        if (structured == null){
            return null;
        } else {
            final Object[] selectedProjects = structured.toArray();         
            ArrayList<IProject> validatedProjects = new ArrayList<IProject>();
            for (final Object projectObj : selectedProjects){
                 if (projectObj instanceof IProject){
                    IProject project = (IProject) projectObj;
                    //do something
                    }
 //rest of the method; returning list of validated projects

我也尝试过 How to convert between an Object[] and an interface (IProject[]) in Java?

但是我在这一行遇到异常:

System.arraycopy(objectarray, 0, projectarray, 0, objectarray.length);

Answer 1

getSelection() 返回的用户界面对象通常不是 IProject、IFile 或 IResource 的直接实例.

要获取IProject ...使用IAdapterManager:

IProject project = (IProject)Platform.getAdapterManager().getAdapter(projectObj, IProject.class);

有时该对象不直接向 IProject 提供适配器，因此请尝试更通用的 IResource:

IResource resource = (IResource)Platform.getAdapterManager().adapt(projectObj, IResource.class);

if (resource instanceof IProject)
 {
   IProject project = (IProject)resource;

   ... your code
 }