private void checkFile() throws ErrorMessage {
InputStream in = null;
try {
in = new FileInputStream(m_file);
} catch (FileNotFoundException e) {
throwError("file not found");
}
SgfReader reader = new SgfReader(in, m_file, null, 0);
GameTree tree = reader.getTree();
if (tree.getBoardSize() != m_size) throwError("size is not " + m_size);
ConstNode root = tree.getRoot();
GoColor toMove = BLACK;
for (ConstNode node = root; node != null; node = node.getChildConst()) {
if (node.hasSetup()) {
if (m_allowSetup) {
if (node == root) toMove = EMPTY;
else throw new ErrorMessage("setup stones" + " in non-root position");
} else throw new ErrorMessage("contains setup stones");
}
Move move = node.getMove();
if (move != null) {
if (toMove == EMPTY) toMove = move.getColor();
if (move.getColor() != toMove) throwError("non-alternating moves");
toMove = toMove.otherColor();
}
}
}