Method findRelativePath

code/src/java/pcgen/util/FileHelper.java:41–99

Find the relative path between two files. @param base The base file. @param relative The file to be made relative. @return relative path

(File base, File relative)

	 * @return relative path 
	 */
	public static String findRelativePath(File base, File relative)
	{
		File testFile;
		File relativeCanon;
		try
		{
			testFile = base.getCanonicalFile();
			relativeCanon = relative.getCanonicalFile();
		}
		catch (IOException e)
		{
			// The file can't be worked with so return it as is.
			return relative.getAbsolutePath();
		}
		if (!testFile.isDirectory())
		{
			testFile = testFile.getParentFile();
		}

		// Cope with files on different drives in Windows.
		if (!testFile.toPath().getRoot().equals(relativeCanon.toPath().getRoot()))
		{
			return relativeCanon.getAbsolutePath();
		}

		String relativePath = stripOffRoot(relativeCanon);

		StringBuilder dots = new StringBuilder();

		do
		{
			if (testFile.getParentFile() == null)
			{
				//we're at the root...
				return dots.append(relativePath).toString();
			}

			String testPath = stripOffRoot(testFile);

			if (relativePath.indexOf(testPath) == 0)
			{
				if (testPath.length() >= relativePath.length())
				{
					Logging.log(Logging.WARNING,
						"Unable to get path for " + relative + " relative to " + base + ". Using absolute path.");
					return relative.getAbsolutePath();
				}
				String pieceToKeep = relativePath.substring(testPath.length() + 1);

				return dots.append(pieceToKeep).toString();
			}
			dots.append("..").append(File.separator);

			testFile = testFile.getParentFile();
		}
		while (testFile != null);

		return dots + relativePath;