package util;

import java.io.File;

import org.apache.log4j.Logger;

public class FileSystem {

	private static final Logger LOGGER = Logger.getLogger(FileSystem.class);

	public static String getRelativePath(File absolutePath, File parentDir) {
		String file;
		String dir;
		try {
			file = absolutePath.getCanonicalPath();
			dir = parentDir.getCanonicalPath() + File.separator;
		} catch (Exception e) {
			LOGGER.error("Could not get relative path for " + absolutePath.toString(), e);
			return null;
		}
		if (!file.startsWith(dir))
			return null;
		return file.substring(dir.length());
	}
}