How to execute inline refactoring programmatically using JDT/LTK? - eclipse

Question

I could use Refactor->Inine when I need to inline a method.
This the code skeleton that I tried, I used the code in this post - Is there any eclipse refactoring API that I can call programmatically?.
// 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();
}
When I execute the code, I got this error
org.eclipse.core.runtime.CoreException: The refactoring script argument 'input' is missing
in the refactoring script.
I think I need to give the refactored method name to the API. What might be wrong in the code?

Answer 1

You never supply the method to the refactoring operation in the above code, you only give it the project context. But I don't know the necessary API for that.
If you look at this source code, you will notice the use of JavaRefactoringDescriptorUtil.ATTRIBUTE_INPUT, which is probably the one you also need to set. Maybe you can search the refactoring.ui plugin sources for references to that attribute.

Answer 2

This is the code that works with inline refactoring JDT API.
It requires start position and length to be inlined.
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());
When you know the name of the method that is going to be inlined, you can use the code in - Getting startPosition and length of a method invocation using JDT