How to know what imports are used in each line?

Hi all,

I'm making a pluing which needs to know what imports(for now it's java only) are being used in each line. Can someone show what's the best way to do so?

Ex: Take this code

1.  import java.io.File;
2.  import java.io.FileReader;
3.  import java.io.IOException;
4. 
5.  public class Exp {
6.     private int from;
7.     private int to;
8.
9.     public static void main(String args[]) throws IOException {
10.        FileReader fileReader = new FileReader(new File("test.java"));
11.        
12.        if (fileReader.ready()) {
13.            System.out.print("File Reader is ready");
14.        } else {
15.            System.out.print("File Reader is not ready");
16.        }
17.    }
18. }

Here:

Line 9 -> java.io.IOException
Line 10 -> java.io.File, java.io.FileReader
Line 12->  java.io.FileReader

All others no imports are used.

Is it possible through psi file??

Thanks in advance.