java - Eclipse PDE : Mimicking IResourceChangeEvents for IJavaProject creation between PDE and developer's workspace?

Question

(注意 - 最终解决方案如下)

在我的插件中，我试图创建一个 IJavaProject (使用 Eclipse JDT，代码在最后)，它创建一个 Java 项目，几乎完全就像 IJavaProject 是由开发人员(或使用该插件的人)创建的一样。我能够从 PDE 创建 IJavaProject，并且工作正常，但我需要模仿 PDE 中创建项目时产生的 IResourceChangeEvents，以匹配在开发人员工作区中创建 Java 项目时产生的 IResourceChangeEvents。

我正在使用我的 IResourceChangeListener 测量“IResourceChangeEvents”(它使用访问者，并且应该是正确的 - 查看代码 here )。在开发人员工作区中创建 Java 项目时，我正在测量以下 IResourceChangeEvents:

CHANGE-ROOT (1 child)
    ADD-PROJECT (5 children)
        ADD-FILE ".classpath"
        ADD-FILE ".project"
        ADD-FOLDER ".settings" ADD-FILE ".prefs"
        ADD-FOLDER ".bin"
        ADD-FOLDER ".src"

当我在 PDE 中使用 Eclipse JDT 创建 IJavaProject 时(代码在最后)，我测量了这些 IResourceChangeEvents:

C-R 
    C-P 
        ADD-FILE ".project"
C-R 
    C-P "JavaProject"                       
C-R 
    C-P 
        CHANGE-FILE ".project"
C-R 
    C-P 
        ADD-FOLDER "bin"
C-R 
    C-P 
        C-F 
            ADD-FILE ".project"             
C-R 
    C-P 
        ADD-FILE ".classpath"
C-R 
    C-P 
        ADD-FOLDER "src"
C-R 
    C-P 
        CHANGED-FILE ".classpath"

其中，C-R 是 CHANGED-ROOT，C-P 是 CHANGED-PROJECT，C-F 是 CHANGED-FILE。

关于创建 IJavaProject 的其他方法有什么建议吗？

这是我的 IJavaProject 创建代码:

public static IJavaProject getJavaProject(IProject project) throws CoreException
{
    return getJavaProject(project, "src", "bin");
}


public static IJavaProject getJavaProject(IProject project, String sourceFolderPath,
                                           String binFolderPath) throws CoreException
{

    if (!project.exists())
        // This creates ADDED (.project)
        ResourceUtility.createProject(project);

    System.out.println("setting description nature id's.");
    IProjectDescription description = project.getDescription();
    description.setNatureIds(new String[] {JavaCore.NATURE_ID});
    System.out.println("setting project description.");
    // Creates CHANGED (JavaProject/.project)
    project.setDescription(description, null);
    System.out.println("Creating project.");

    // Does not do anything.
    IJavaProject javaProject = JavaCore.create(project);
    IFolder binFolder = project.getFolder(binFolderPath);
    // Creates ADDED (JavaProject/bin)
    binFolder.create(false, true, null);
    javaProject.setOutputLocation(binFolder.getFullPath(), null);
    System.out.println("Installing VM.");

    List<IClasspathEntry> entries = new ArrayList<>();
    IVMInstall vmInstall = JavaRuntime.getDefaultVMInstall();
    System.out.println("JDTUtil: vmInstall: " + vmInstall);
    LibraryLocation[] locations = JavaRuntime.getLibraryLocations(vmInstall);
    System.out.println("JDTUtil: lib locations: " + locations);
    // Creates ADDED (JavaProject/bin/.project) - ignored by RCL
    for (LibraryLocation element: locations)
    {
        entries.add(JavaCore.newLibraryEntry(element.getSystemLibraryPath(), null, null));
    }
    // add libs to project class path
    // Creates ADDED (JavaProject/.classpath)
    javaProject.setRawClasspath(entries.toArray(new IClasspathEntry[entries.size()]), null);
    //
    IFolder sourceFolder = project.getFolder(sourceFolderPath);
    // Creates ADDED (JavaProject/src)
    sourceFolder.create(false, true, null);

    IPackageFragmentRoot root = javaProject.getPackageFragmentRoot(sourceFolder);
    IClasspathEntry[] oldEntries = javaProject.getRawClasspath();
    IClasspathEntry[] newEntries = new IClasspathEntry[oldEntries.length + 1];
    System.arraycopy(oldEntries, 0, newEntries, 0, oldEntries.length);
    newEntries[oldEntries.length] = JavaCore.newSourceEntry(root.getPath());
    // Creates CHANGED (JavaProject/.classpath)
    javaProject.setRawClasspath(newEntries, null);
    return javaProject;
}

最终解决方案

正如下面的答案中提到的，我对资源更改事件进行了批处理，这导致 Eclipse 构建 IJavaProject 的方式与不进行批处理时的方式大不相同，而且效率更高。因此，我的 IJavaProject 创建现在与 Eclipse 用于 IJavaProject 创建的内部资源树表示相匹配(WOOHOO!)。

这是我的最终解决方案:

public static IJavaProject getJavaProjectBatched(final IProject project, final String sourceFolderPath,
                                                 final String binFolderPath) throws CoreException
{
    IWorkspaceRunnable r = new IWorkspaceRunnable()
    {
         @Override public void run(@Nullable IProgressMonitor monitor) throws CoreException
        {
             if (!project.exists())
                 ResourceUtility.createProject(project);

             IProjectDescription description = project.getDescription();
             description.setNatureIds(new String[] {JavaCore.NATURE_ID});
             project.setDescription(description, null);

             IFolder binFolder = project.getFolder(binFolderPath);
             binFolder.create(false, true, null);
             final IFolder sourceFolder = project.getFolder(sourceFolderPath);
             sourceFolder.create(false, true, null);

             final IJavaProject javaProject = JavaCore.create(project);
             javaProject.setOutputLocation(binFolder.getFullPath(), null);

            IPackageFragmentRoot root = javaProject.getPackageFragmentRoot(sourceFolder);
            IClasspathEntry[] newEntries = new IClasspathEntry[1];
            newEntries[0] = JavaCore.newSourceEntry(root.getPath());
            javaProject.setRawClasspath(newEntries, null); 
        }
    };

    project.getWorkspace().run(r, null,IWorkspace.AVOID_UPDATE, null);
    @SuppressWarnings("null") @NonNull IJavaProject javaProject = JavaCore.create(project);
    return javaProject;
}

这是新的资源树，它与我上面需要的资源树相匹配(不包括 .settings 文件夹 - 只是手动创建的工件)。

CHANGE-ROOT (1 child)
    ADD-PROJECT (4 children)
        ADD-FILE ".classpath"
        ADD-FILE ".project"
        ADD-FOLDER ".bin"
        ADD-FOLDER ".src"

Answer 1

尝试以下两件事:

• 使用 IWorkspaceRunnable 的实现将所有资源更改批处理到单个事务中。这应该会使更改看起来更像创建项目资源增量。

• 确保在运行代码之前已从磁盘中删除该项目。看起来您已从工作区中删除了它，但没有从文件系统中删除它。