void save() throws Exception {
ByteBuffer buffer = ByteBuffer.allocate(1);
buffer.put(rootPage.getUnique() ? (byte) 1 : (byte) 0);
buffer.position(0);
raFile.write(buffer);
((FileIndexNode) rootPage).save();
}
static FileIndex load(FileChannel raFile) throws Exception {
ByteBuffer buffer = ByteBuffer.allocate(1);
raFile.read(buffer);
buffer.position(0);
boolean unique = buffer.get() != 0;
FileIndexNode root = FileIndexNode.loadRootNode(unique, raFile, raFile.position());
return new FileIndex(root, raFile);
}