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我目前正在开发一个 Eclipse 插件，它可以让我使用手势触发重构。我一直在尝试在 Eclipse 中以编程方式触发“提取方法”一段时间，但我经常遇到问题。我在寻找解决方案时发现的大多数建议都需要使用内部类。

我现在被困在这个代码模板上。问题是我找不到可以将要提取的代码作为 ISelection 或类似内容的地方。

RefactoringContribution rc = RefactoringCore.getRefactoringContribution(IJavaRefactorings.EXTRACT_METHOD);
ExtractMethodDescriptor rd = (ExtractMethodDescriptor) rc.createDescriptor();

rd.setProject(staticHelper.getIProject().getName());
//There should be some more rd.setXXXXX() here.

RefactoringStatus rs = new RefactoringStatus();

try {
    Refactoring r = rd.createRefactoring(rs);
    IProgressMonitor pm = new NullProgressMonitor();

    r.checkInitialConditions(pm);
    r.checkFinalConditions(pm);

    Change change = r.createChange(pm);
    change.perform(pm);
}

catch(Exception e) {e.printStackTrace();}
}

以下方法有效，但它使用内部 API：

@SuppressWarnings("restriction")    //Works but is INTERNAL USE ONLY
public static void extractMethodRefactoring() {
    ITextSelection selection = staticHelper.getITextSelection();
    int start = selection.getOffset();
    int length = selection.getLength();


    //The following line is part of the internal API
    ExtractMethodRefactoring tempR = new ExtractMethodRefactoring(staticHelper.getICompilationUnit(), start, length);

    try {
        NullProgressMonitor pm = new NullProgressMonitor();
        tempR.checkAllConditions(pm);
        Change change = tempR.createChange(pm);
        change.perform(pm);
    } catch (Exception e) {e.printStackTrace();}

}

这同样需要内部类 ExtractMethodRefactoring，但不应使用该类。

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