/** Convert an ExtendedBlock to a Json map. */
private static Map<String, Object> toJsonMap(final ExtendedBlock extendedblock) {
if (extendedblock == null) {
return null;
}
final Map<String, Object> m = new TreeMap<String, Object>();
m.put("blockPoolId", extendedblock.getBlockPoolId());
m.put("blockId", extendedblock.getBlockId());
m.put("numBytes", extendedblock.getNumBytes());
m.put("generationStamp", extendedblock.getGenerationStamp());
return m;
}