Review

finding-1

/mubench/checkouts/itext/5091/build/src/main/java/com/itextpdf/text/pdf/PdfEncodings.java

addExtraEncoding(String, ExtraEncoding)

class PdfEncodings {
    /** Adds an extra encoding.
     * @param name the name of the encoding. The encoding recognition is case insensitive
     * @param enc the conversion class
     */
    @SuppressWarnings("unchecked")
    public static void addExtraEncoding(String name, ExtraEncoding enc) {
        synchronized (extraEncodings) { // This serializes concurrent updates
            HashMap<String, ExtraEncoding> newEncodings = (HashMap<String, ExtraEncoding>)extraEncodings.clone();
            newEncodings.put(name.toLowerCase(), enc);
            extraEncodings = newEncodings;  // This swap does not require synchronization with reader
        }
    }

}