how to get after state name

Now I am writing a server precondition using RTC-SDK.

When a source file renamed to the other name, I want to get it new name.

For example, a source file Test1.java was named to Test2.java, and then deliver the change to the stream.

So In my server deliver precondition trigger, how can I use IChange to get the Test2.java name?

I have try below source:

//I found RENAME value is 4, but change.kind()  get 6, so I assume change.kind()= MODIFIED(2) + RENAME(4) = 6, and

// the rename kind will get in the if condition statement.

if (change.kind() == IChange.MODIFIED || change.kind() == (IChange.MODIFIED + IChange.RENAME)) {
     IVersionableHandle versionableHandle = change.afterState();
     ServiceConfigurationProvider configProvider = ServiceConfigurationProvider.FACTORY.create(
       data.getDestWorkspace(), changeSet.getComponent());
     IVersionable item = (IVersionable) scmService.fetchState(versionableHandle, null, null);
     IAncestorReport reports[] = scmService.configurationLocateAncestors(
       configProvider, new IVersionableHandle[] {versionableHandle}, null, null);

    String path = toFullPath(item, reports[0].getNameItemPairs()) 

     IAdvisorInfo info = collector.createProblemInfo(
       "Deliver of rename or modified  files is prohibited",
       "The file " + toFullPath(item, reports[0].getNameItemPairs()) + " is not allowed to be modified or deleted.",
       "error");
     collector.addInfo(info);               
    }

private String toFullPath(IVersionable versionable, List<INameItemPair> segments) {
        StringBuffer path = new StringBuffer();
        if(segments.isEmpty()) {
         return versionable.getName();
        }
        for (INameItemPair nameItemPair : segments) {
         if(path.length() != 0) {
          path.append(Path.SEPARATOR);
         }
         // ignore the root folder which doesn't have a name
         if(nameItemPair.getName() != null)
          path.append(nameItemPair.getName());
     }
        return path.toString();
 }

question 1:

I found whatever I used  versionableHandle = change.afterState(); or change.beforeState(), the path always return Test2.java to me, I do not know why. So, How can I get Test3.java name?

question 2:

the function toFullPath only can get full path in MODIFIED and DELETED kind. If kind =ADD kind, segments.isEmpty()) will be true, so full path can not be get when ADD kind. So, How can I get Test2 or Test3 full path?

This two question confuse me so long! Please give me some advise.