protected static Header readHeader(DataInput in) throws Exception {
short magic_number = in.readShort();
Class clazz = ClassConfigurator.get(magic_number);
if (clazz == null)
throw new IllegalArgumentException(
"magic number " + magic_number + " is not available in magic map");
Header hdr = (Header) clazz.newInstance();
hdr.readFrom(in);
return hdr;
}
private static Header readHeader(DataInputStream in) throws IOException {
try {
short magic_number = in.readShort();
Class clazz = ClassConfigurator.get(magic_number);
if (clazz == null)
throw new IllegalArgumentException(
"magic number " + magic_number + " is not available in magic map");
Header hdr = (Header) clazz.newInstance();
hdr.readFrom(in);
return hdr;
} catch (Exception ex) {
IOException io_ex = new IOException("failed reading header");
io_ex.initCause(ex);
throw io_ex;
}
}
