private static String getRelativeFilePath()

in doxia-integration-tools/src/main/java/org/apache/maven/doxia/tools/DefaultSiteTool.java [264:309]

26 lines of code
12 McCabe index (conditional complexity)


    private static String getRelativeFilePath(final String oldPath, final String newPath) {
        // normalize the path delimiters

        String fromPath = new File(oldPath).getPath();
        String toPath = new File(newPath).getPath();

        // strip any leading slashes if its a windows path
        if (toPath.matches("^\\[a-zA-Z]:")) {
            toPath = toPath.substring(1);
        }
        if (fromPath.matches("^\\[a-zA-Z]:")) {
            fromPath = fromPath.substring(1);
        }

        // lowercase windows drive letters.
        if (fromPath.startsWith(":", 1)) {
            fromPath = Character.toLowerCase(fromPath.charAt(0)) + fromPath.substring(1);
        }
        if (toPath.startsWith(":", 1)) {
            toPath = Character.toLowerCase(toPath.charAt(0)) + toPath.substring(1);
        }

        // check for the presence of windows drives. No relative way of
        // traversing from one to the other.

        if ((toPath.startsWith(":", 1) && fromPath.startsWith(":", 1))
                && (!toPath.substring(0, 1).equals(fromPath.substring(0, 1)))) {
            // they both have drive path element but they don't match, no
            // relative path

            return null;
        }

        if ((toPath.startsWith(":", 1) && !fromPath.startsWith(":", 1))
                || (!toPath.startsWith(":", 1) && fromPath.startsWith(":", 1))) {

            // one has a drive path element and the other doesn't, no relative
            // path.

            return null;
        }

        final String relativePath = buildRelativePath(toPath, fromPath, File.separatorChar);

        return relativePath.toString();
    }