import java.io.File;
import java.time.Instant;

import org.eclipse.jgit.util.FS;

public class DirCacheDump {

	private void run(String fileName) throws Exception {
		File f = new File(fileName);
		Instant time = FS.DETECTED.lastModifiedInstant(f);
		System.out.println("Index has timestamp " + time); //$NON-NLS-1$
		DirCache dc = DirCache.read(f, FS.DETECTED);
		DirCacheIterator i = new DirCacheIterator(dc);
		while (!i.eof()) {
			handleEntry(i);
			i.next(1);
		}
		System.out.println("Index has timestamp " + time); //$NON-NLS-1$
	}

	private void handleEntry(DirCacheIterator i) throws Exception {
		DirCacheEntry e = i.getDirCacheEntry();
		if (e == null) {
			// Must be a subtree
			DirCacheIterator sub = (DirCacheIterator) i
					.createSubtreeIterator(null);
			while (!sub.eof()) {
				handleEntry(sub);
				sub.next(1);
			}
		} else {
			Instant time = e.getLastModifiedInstant();
			System.out.println(i.getEntryPathString() + ' ' + time);
		}
	}

	public static void main(String[] args) {
		try {
			new DirCacheDump().run(args[0]);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}