static String autoDetectEncoding()

in src/main/java/org/apache/maven/doxia/DefaultConverter.java [690:715]

• 23 lines of code
• 4 McCabe index (conditional complexity)

    static String autoDetectEncoding(File f) {
        if (!f.isFile()) {
            throw new IllegalArgumentException(
                    "The file '" + f.getAbsolutePath() + "' is not a file, could not detect encoding.");
        }
        try {
            if (XmlUtil.isXml(f)) {
                try (XmlStreamReader reader = new XmlStreamReader(f)) {
                    return reader.getEncoding();
                }
            }

            try (InputStream is = new BufferedInputStream(new FileInputStream(f))) {
                CharsetDetector detector = new CharsetDetector();
                detector.setText(is);
                CharsetMatch match = detector.detect();

                return match.getName().toUpperCase(Locale.ENGLISH);
            }
        } catch (IOException e) {
            // nop
        }
        throw new UnsupportedOperationException(format(
                "Could not detect the encoding for file: %s\n" + "Specify explicitly the encoding.",
                f.getAbsolutePath()));
    }