private synchronized void init() throws SQLException {
if (isClosed) return;
// do tables exists?
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(TABLE_NAMES_SELECT_STMT);
ArrayList<String> missingTables = new ArrayList(TABLES.keySet());
while (rs.next()) {
String tableName = rs.getString("name");
missingTables.remove(tableName);
}
for (String missingTable : missingTables) {
try {
Statement createStmt = conn.createStatement();
// System.out.println("Adding table "+ missingTable);
createStmt.executeUpdate(TABLES.get(missingTable));
createStmt.close();
} catch (Exception e) {
System.err.println(e.getClass().getName() + ": " + e.getMessage());
}
}
}
public synchronized void close() {
if (isClosed) return;
try {
if (conn != null) conn.close();
isClosed = true;
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public String getUsername(byte[] encodedKey) {
String b64key = Base64.getEncoder().encodeToString(encodedKey);
try {
try (PreparedStatement preparedStatement =
conn.prepareStatement("select name from users where publickey = ? limit 1")) {
preparedStatement.setString(1, b64key);
ResultSet resultSet = preparedStatement.executeQuery();
boolean next = resultSet.next();
if (!next) return "";
return resultSet.getString(1);
}
} catch (SQLException sqle) {
throw new IllegalStateException(sqle);
}
}
public boolean delete(String table, String deleteString) {
Statement stmt = null;
try {
stmt = conn.createStatement();
stmt.executeUpdate("delete from " + table + " where " + deleteString + ";");
return true;
} catch (SQLException sqe) {
sqe.printStackTrace();
return false;
} finally {
if (stmt != null)
try {
stmt.close();
} catch (SQLException sqe2) {
sqe2.printStackTrace();
}
}
}
@Override
public byte[] getAllUsernamesGzip() throws IOException {
try (PreparedStatement stmt = conn.prepareStatement("select name from users")) {
ResultSet rs = stmt.executeQuery();
List<String> list = new ArrayList<>();
while (rs.next()) {
String username = rs.getString("name");
list.add(username);
}
ByteArrayOutputStream bout = new ByteArrayOutputStream();
try (DataOutputStream dout = new DataOutputStream(new GZIPOutputStream(bout))) {
for (String uname : list) Serialize.serialize(uname, dout);
}
return bout.toByteArray();
} catch (SQLException sqe) {
throw new IOException(sqe);
}
}