Examples of java.math.BigInteger.signum()

java.math.BigInteger.signum()
Returns the signum function of this BigInteger. @return -1, 0 or 1 as the value of this BigInteger is negative, zero orpositive.

                result.set(Calendar.ERA, year < 0 ? GregorianCalendar.BC : GregorianCalendar.AD);
                result.set(Calendar.YEAR, Math.abs(year));
            }
            else {
                BigInteger eonAndYear = getEonAndYear();
                result.set(Calendar.ERA, eonAndYear.signum() == -1 ? GregorianCalendar.BC : GregorianCalendar.AD);
                result.set(Calendar.YEAR, eonAndYear.abs().intValue());
            }
        }


        // only set month if it is set

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                result.set(Calendar.ERA, year < 0 ? GregorianCalendar.BC : GregorianCalendar.AD);
                result.set(Calendar.YEAR, Math.abs(year));
            }
            else {
                final BigInteger eonAndYear = getEonAndYear();
                result.set(Calendar.ERA, eonAndYear.signum() == -1 ? GregorianCalendar.BC : GregorianCalendar.AD);
                result.set(Calendar.YEAR, eonAndYear.abs().intValue());
            }
        }
        else {
            // use default if set

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                        result.set(Calendar.ERA, defaultYear < 0 ? GregorianCalendar.BC : GregorianCalendar.AD);
                        result.set(Calendar.YEAR, Math.abs(defaultYear));
                    }
                    else {
                        final BigInteger defaultEonAndYear = defaults.getEonAndYear();
                        result.set(Calendar.ERA, defaultEonAndYear.signum() == -1 ? GregorianCalendar.BC : GregorianCalendar.AD);
                        result.set(Calendar.YEAR, defaultEonAndYear.abs().intValue());
                    }
                }
            }
        }

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    }


    public BigIntegerToken getRandomToken()
    {
        BigInteger token = FBUtilities.hashToBigInteger(GuidGenerator.guidAsBytes());
        if ( token.signum() == -1 )
            token = token.multiply(BigInteger.valueOf(-1L));
        return new BigIntegerToken(token);
    }


    private final Token.TokenFactory<BigInteger> tokenFactory = new Token.TokenFactory<BigInteger>() {

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    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }
  
  /**
   * modPow: negative exponent
   */

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    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }


  /**
   * modInverse: non-positive modulus
   */

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    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }


  /**
   * modInverse: positive number (another case: a < 0)
   */

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    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }


  /**
   * modInverse: negative number
   */

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    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }


  /**
   * modInverse: negative number (another case: x < 0)
   */

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    byte resBytes[] = new byte[rBytes.length];
    resBytes = result.toByteArray();
    for(int i = 0; i < resBytes.length; i++) {
      assertTrue(resBytes[i] == rBytes[i]);
    }
    assertEquals("incorrect sign", 1, result.signum());
  }
  
  /**
   * gcd: the second number is zero
   */

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