如何使用JDT/LTK以编程方式执行内联重构？

Question

当我需要内联一个方法时，我可以使用Refactor->Inine。

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这是我尝试过的代码框架，我在这篇Is there any eclipse refactoring API that I can call programmatically?文章中使用了代码。

// 1. Get ICompiationUnit for type "smcho.Hello"
IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
IProject project = root.getProject("Hello");
project.open(null /* IProgressMonitor */);

IJavaProject javaProject = JavaCore.create(project);
IType itype = javaProject.findType("smcho.Hello");
org.eclipse.jdt.core.ICompilationUnit icu = itype.getCompilationUnit();

// 2. Contribution and Description creation
RefactoringContribution contribution = RefactoringCore.getRefactoringContribution(IJavaRefactorings.INLINE_METHOD);
InlineMethodDescriptor descriptor = (InlineMethodDescriptor) contribution.createDescriptor();

descriptor.setProject(icu.getResource().getProject().getName( ));

// 3. executing the refactoring
RefactoringStatus status = new RefactoringStatus();
try {
    Refactoring refactoring = descriptor.createRefactoring(status);

    IProgressMonitor monitor = new NullProgressMonitor();
    refactoring.checkInitialConditions(monitor);
    refactoring.checkFinalConditions(monitor);
    Change change = refactoring.createChange(monitor);
    change.perform(monitor);
} catch (CoreException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
} 

当我执行代码时，我得到了这个错误

org.eclipse.core.runtime.CoreException: The refactoring script argument 'input' is missing 
in the refactoring script.  

我认为我需要为API提供重构后的方法名。代码中可能存在什么错误？

Answer 1

这是使用内联重构JDT API的代码。它需要内联起始位置和长度。

int[] selection= {start, length}; // getSelection();
InlineMethodRefactoring refactoring= InlineMethodRefactoring.create(this.icu, new RefactoringASTParser(ASTProvider.SHARED_AST_LEVEL).parse(this.icu, true), selection[0], selection[1]);
refactoring.setDeleteSource(true);
refactoring.setCurrentMode(Mode.INLINE_ALL); // or INLINE SINGLE based on the user's intervention

IProgressMonitor pm= new NullProgressMonitor();
RefactoringStatus res = refactoring.checkInitialConditions(pm);
res = refactoring.checkFinalConditions(pm);

final PerformRefactoringOperation op= new PerformRefactoringOperation(
refactoring, getCheckingStyle());
op.run(new NullProgressMonitor());

当您知道将要内联的方法的名称时，可以使用- Getting startPosition and length of a method invocation using JDT中的代码

Answer 2

在上面的代码中，您从来没有为重构操作提供方法，您只为它提供了项目上下文。但我不知道实现这一点所需的API。

如果您查看this source code，您会注意到JavaRefactoringDescriptorUtil.ATTRIBUTE_INPUT，的使用，这可能也是您需要设置的内容。也许您可以在refactoring.ui插件源代码中搜索对该属性的引用。