long freeSpaceUnix()

in src/main/java/org/apache/commons/io/FileSystemUtils.java [296:336]
33 lines of code
9 McCabe index (conditional complexity)

    long freeSpaceUnix(final String path, final boolean kb, final boolean posix, final Duration timeout)
            throws IOException {
        if (path.isEmpty()) {
            throw new IllegalArgumentException("Path must not be empty");
        }

        // build and run the 'dir' command
        String flags = "-";
        if (kb) {
            flags += "k";
        }
        if (posix) {
            flags += "P";
        }
        final String[] cmdAttribs = flags.length() > 1 ? new String[] { DF, flags, path } : new String[] { DF, path };

        // perform the command, asking for up to 3 lines (header, interesting, overflow)
        final List<String> lines = performCommand(cmdAttribs, 3, timeout);
        if (lines.size() < 2) {
            // unknown problem, throw exception
            throw new IOException("Command line '" + DF + "' did not return info as expected for path '" + path + "'- response was " + lines);
        }
        final String line2 = lines.get(1); // the line we're interested in

        // Now, we tokenize the string. The fourth element is what we want.
        StringTokenizer tok = new StringTokenizer(line2, " ");
        if (tok.countTokens() < 4) {
            // could be long Filesystem, thus data on third line
            if (tok.countTokens() != 1 || lines.size() < 3) {
                throw new IOException("Command line '" + DF + "' did not return data as expected for path '" + path + "'- check path is valid");
            }
            final String line3 = lines.get(2); // the line may be interested in
            tok = new StringTokenizer(line3, " ");
        } else {
            tok.nextToken(); // Ignore Filesystem
        }
        tok.nextToken(); // Ignore 1K-blocks
        tok.nextToken(); // Ignore Used
        final String freeSpace = tok.nextToken();
        return parseBytes(freeSpace, path);
    }