| 0,0 → 1,327 |
|---|
| package de.viathinksoft.immortable.genX; |
| |
| // TODO: r als BigInteger |
| |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileReader; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| import java.math.BigInteger; |
| import java.util.Vector; |
| |
| /** |
| * Immortable Iterator |
| * |
| * @author Daniel Marschall, René Gruber |
| * @see http://www.matheboard.de/thread.php?postid=1259938 |
| */ |
| public class ImmortableNumberSearch { |
| |
| private static final String SIGNATURE = "Immortable Number Report File Version 2000"; |
| private static final String SIGNATURE_MINOR = "Iterator GenX Java int"; |
| private static final String END_SIG = "END OF REPORT"; |
| private static final int SOFTBREAK = 76; |
| |
| private Vector<Integer> a = null; |
| private String filename; |
| private int saveInterval = 10000; |
| private int u = -1; |
| private int r = -1; |
| private String creation_time; |
| private String backupDir = "backup"; |
| |
| public ImmortableNumberSearch(String filename) throws LoadException { |
| this.filename = filename; |
| load(); |
| } |
| |
| public String getBackupDir() { |
| return backupDir; |
| } |
| |
| public void setBackupDir(String backupDir) { |
| this.backupDir = backupDir; |
| } |
| |
| public int getSaveInterval() { |
| return this.saveInterval; |
| } |
| |
| public Vector<Integer> getA() { |
| return a; |
| } |
| |
| public int getU() { |
| return u; |
| } |
| |
| public int getR() { |
| return r; |
| } |
| |
| public String getFilename() { |
| return filename; |
| } |
| |
| public void setSaveInterval(int saveInterval) { |
| this.saveInterval = saveInterval; |
| } |
| |
| private boolean savePointExists() { |
| return new File(filename).exists(); |
| } |
| |
| private void load() throws LoadException { |
| if (!savePointExists()) { |
| return; |
| } |
| |
| BufferedReader f; |
| try { |
| f = new BufferedReader(new FileReader(filename)); |
| } catch (FileNotFoundException e) { |
| // Will not happen because of savePointExists(). |
| return; |
| } |
| |
| a = null; |
| u = -1; |
| r = -1; |
| |
| try { |
| try { |
| String s = f.readLine(); |
| if (!s.equals(SIGNATURE)) { |
| throw new LoadException("Wrong signature"); |
| } |
| |
| f.readLine(); // Minor. signature |
| f.readLine(); // "" |
| |
| f.readLine(); // "(Starting time)" |
| creation_time = f.readLine(); |
| f.readLine(); // "" |
| |
| f.readLine(); // "(Save timestamp)" |
| f.readLine(); // Timestamp |
| f.readLine(); // "" |
| |
| f.readLine(); // "(u)" |
| s = f.readLine(); |
| u = Integer.parseInt(s); |
| f.readLine(); // "" |
| |
| f.readLine(); // "(r)" |
| s = f.readLine(); |
| r = Integer.parseInt(s); // FUTURE: (1) Multi-Line-Support? |
| f.readLine(); // "" |
| |
| f.readLine(); // "(M5rev)" |
| a = new Vector<Integer>(); |
| do { |
| s = f.readLine(); |
| for (int i = 0; i < s.length(); i++) { |
| a.add(new Integer(s.substring(i, i + 1))); |
| } |
| } while (!s.equals("")); |
| |
| if (!integryTest()) { |
| throw new LoadException("Corrupt: Not immortable!"); |
| } |
| |
| if (u+1 != a.size()) { |
| throw new LoadException( |
| "Corrupt: Formal and actual length mismatch!"); |
| } |
| |
| s = f.readLine(); |
| if (!s.equals(END_SIG)) { |
| throw new LoadException("Corrupt: End-signature mismatch."); |
| } |
| } finally { |
| f.close(); |
| } |
| } catch (IOException e) { |
| throw new LoadException(e); |
| } |
| } |
| |
| private void save(boolean integrityTest) throws SaveException { |
| if (integrityTest) { |
| if (!integryTest()) { |
| throw new SaveException( |
| "Integrity test failed. Will not save."); |
| } |
| } |
| |
| String timestamp = DateUtils.now("EEE, d MMM yyyy HH:mm:ss Z"); |
| String timestamp_filename = DateUtils.now("dd-MM-yyyy_HH-mm-ss"); |
| |
| try { |
| BufferedWriter f = new BufferedWriter(new FileWriter(filename)); |
| |
| try { |
| f.write(SIGNATURE + "\r\n"); |
| |
| f.write(SIGNATURE_MINOR + "\r\n"); |
| f.write("\r\n"); |
| |
| f.write("(Starting time)\r\n"); |
| f.write(creation_time + "\r\n"); |
| f.write("\r\n"); |
| |
| f.write("(Save timestamp)\r\n"); |
| f.write(timestamp + "\r\n"); |
| f.write("\r\n"); |
| |
| f.write("(u)\r\n"); |
| f.write(u + "\r\n"); |
| f.write("\r\n"); |
| |
| f.write("(r)\r\n"); |
| f.write(r + "\r\n"); // FUTURE: (1) Multi-Line-Support? |
| f.write("\r\n"); |
| |
| f.write("(M5rev)\r\n"); |
| int i = 0; |
| for (Integer xa : a) { |
| f.write(xa.toString()); |
| if (++i % SOFTBREAK == 0) { |
| f.write("\r\n"); |
| } |
| } |
| if (++i % SOFTBREAK != 0) { |
| f.write("\r\n"); |
| } |
| f.write("\r\n"); |
| |
| f.write(END_SIG); |
| } finally { |
| f.close(); |
| } |
| } catch (IOException e) { |
| throw new SaveException("Could not save master file.", e); |
| } |
| |
| // Make backup |
| |
| new File(backupDir).mkdir(); |
| String bak_filename = backupDir + "/immortal_" + timestamp_filename + "_" + (u+1) |
| + ".txt"; |
| try { |
| FileUtils.copyFile(new File(filename), new File(bak_filename)); |
| } catch (IOException e) { |
| throw new SaveException("Could not make backup", e); |
| } |
| } |
| |
| public void calcIterate(int amount) throws SaveException { |
| int s, m, k; |
| int cnt = 0; |
| |
| // Wir führen beim ersten Speichern einen weiteren |
| // integrity-Test durch. Grund: Wäre bei einer Fortsetzung einer |
| // Datei das "r" falsch (der Datenteil aber korrekt), dann würde |
| // diese Datei beim Speichern ungültige Daten enthalten (Zahl |
| // nicht immortabel). |
| boolean firstSave = true; |
| |
| if (a == null) { |
| creation_time = DateUtils.now("EEE, d MMM yyyy HH:mm:ss Z"); |
| a = new Vector<Integer>(); |
| a.add(5); |
| a.add(2); |
| u = 1; |
| r = 2; |
| cnt += 2; |
| } |
| |
| do { |
| r = (r - a.elementAt(u)) / 10 + a.elementAt(u); |
| s = 0; |
| for (m = 1, k = u; m < k; m++, k--) { |
| s += a.elementAt(m) * a.elementAt(k); |
| } |
| r += 2 * s; |
| if (m == k) { |
| r += a.elementAt(m) * a.elementAt(m); |
| } |
| u++; |
| a.add(r % 10); |
| |
| if (cnt % saveInterval == 0) { |
| save(firstSave); |
| firstSave = false; |
| } |
| } while (++cnt != amount); |
| |
| // Wir brauchen nicht zwei Mal zu speichern |
| if (cnt-1 % saveInterval != 0) { |
| save(firstSave); |
| firstSave = false; |
| } |
| } |
| |
| public int getDigit(int u) { |
| return a.elementAt(u); |
| } |
| |
| public StringBuilder M5_StringBuilder(int u) { |
| StringBuilder s = new StringBuilder(); |
| for (Integer xa : a) { |
| s.append(xa); |
| } |
| s.reverse(); |
| return s; |
| } |
| |
| public String M5_String(int u) { |
| return M5_StringBuilder(u).toString(); |
| } |
| |
| public BigInteger M5_BigInteger(int u) { |
| return new BigInteger(M5_String(u)); |
| } |
| |
| public StringBuilder M6_StringBuilder(int u) { |
| StringBuilder s = new StringBuilder(); |
| boolean first = true; |
| for (Integer xa : a) { |
| if (first) { |
| s.append(6); // xa = 5 |
| first = false; |
| } else { |
| s.append(9 - xa); |
| } |
| } |
| s.reverse(); |
| return s; |
| } |
| |
| public String M6_String(int u) { |
| return M6_StringBuilder(u).toString(); |
| } |
| |
| public BigInteger M6_BigInteger(int u) { |
| return new BigInteger(M6_String(u)); |
| } |
| |
| private static boolean isImmortable(BigInteger num) { |
| // Ist das auch OK? |
| // return num.pow(2).toString().endsWith(num.toString()); |
| |
| // n² === n (mod 10^m) <===> n²%10^m == n%10^m |
| int m = num.toString().length(); |
| BigInteger m_pow = BigInteger.TEN.pow(m); |
| return num.pow(2).mod(m_pow).equals(num.mod(m_pow)); |
| |
| } |
| |
| public boolean integryTest() { |
| // return isImmortable(M5_BigInteger(u)); |
| return isImmortable(M6_BigInteger(u)); |
| } |
| } |
| Property changes: |
|---|
| Added: svn:mime-type |
|---|
| +text/plain |
|---|
| \ No newline at end of property |
|---|