*/
static public Set<String> getImageSuffixes() {
synchronized(disallowedSuffixes) {
if (cachedImageSuffixes == null) {
cachedImageSuffixes = new HashSet<String>(Arrays.asList(
new ImageReader().getSuffixes()));
cachedImageSuffixes.removeAll(disallowedSuffixes);
}
}
return cachedImageSuffixes;
}