Example usage for java.math BigInteger subtract

Introduction

In this page you can find the example usage for java.math BigInteger subtract.

Prototype

public BigInteger subtract(BigInteger val) 

Source Link

Document

Returns a BigInteger whose value is (this - val) .

Usage

From source file:RSA.java

/** Generate a new public and private key set. */
public synchronized void generateKeys() {
    SecureRandom r = new SecureRandom();
    BigInteger p = new BigInteger(bitlen / 2, 100, r);
    BigInteger q = new BigInteger(bitlen / 2, 100, r);
    n = p.multiply(q);//from  w ww.  j  a  va2 s. com
    BigInteger m = (p.subtract(BigInteger.ONE)).multiply(q.subtract(BigInteger.ONE));
    e = new BigInteger("3");
    while (m.gcd(e).intValue() > 1) {
        e = e.add(new BigInteger("2"));
    }
    d = e.modInverse(m);
}

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From source file:RSA.java

/** Create an instance that can both encrypt and decrypt. */
public RSA(int bits) {
    bitlen = bits;/*  w  w  w.  java  2 s .c  om*/
    SecureRandom r = new SecureRandom();
    BigInteger p = new BigInteger(bitlen / 2, 100, r);
    BigInteger q = new BigInteger(bitlen / 2, 100, r);
    n = p.multiply(q);
    BigInteger m = (p.subtract(BigInteger.ONE)).multiply(q.subtract(BigInteger.ONE));
    e = new BigInteger("3");
    while (m.gcd(e).intValue() > 1) {
        e = e.add(new BigInteger("2"));
    }
    d = e.modInverse(m);
}

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From source file:com.google.uzaygezen.core.ranges.BigIntegerRange.java

BigInteger overlap(BigIntegerRange other) {
    if (start.compareTo(other.getEnd()) >= 0 || end.compareTo(other.getStart()) <= 0) {
        return BigInteger.ZERO;
    } else {//  w  w  w  .  j  a  v  a2s .c  o m
        if (start.compareTo(other.getStart()) < 0 || end.compareTo(other.getEnd()) > 0) {
            BigInteger x = getEnd().min(other.getEnd());
            BigInteger y = getStart().max(other.getStart());
            return x.subtract(y);
        } else {
            return end.subtract(start);
        }
    }
}

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From source file:net.sf.jasperreports.data.cache.BigIntegerStore.java

protected ColumnValues createPrimitiveValues(boolean useOffset) {
    if (primitiveStore == null) {
        primitiveStore = new LongArrayStore(rawStore.size(), true);
    } else {/*from ww w  . j a v a 2  s .co  m*/
        primitiveStore.resetValues();
    }

    int count = rawStore.count();
    Object[] values = rawStore.valuesBuffer();
    for (int i = 0; i < count; i++) {
        BigInteger value = (BigInteger) values[i];
        if (useOffset) {
            value = value.subtract(min);
        }
        primitiveStore.add(value.longValue());
    }

    ColumnValues primitiveValues = primitiveStore.createValues();
    return primitiveValues;
}

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From source file:libra.common.kmermatch.KmerJoiner.java

public float getProgress() {
    if (this.progressKey == null) {
        if (this.eof) {
            return 1.0f;
        } else {/*from w  w w . j a  v a2  s.  c  o m*/
            return 0.0f;
        }
    } else {
        BigInteger seq = SequenceHelper.convertToBigInteger(this.progressKey.getSequence());
        BigInteger prog = seq.subtract(this.beginSequence);
        int comp = this.partitionSize.compareTo(prog);
        if (comp <= 0) {
            return 1.0f;
        } else {
            BigDecimal progDecimal = new BigDecimal(prog);
            BigDecimal rate = progDecimal.divide(new BigDecimal(this.partitionSize), 3,
                    BigDecimal.ROUND_HALF_UP);

            float f = rate.floatValue();
            return Math.min(1.0f, f);
        }
    }
}

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From source file:org.apache.hama.util.Bytes.java

/**
 * Split passed range. Expensive operation relatively. Uses BigInteger math.
 * //  w  ww.  j a v a2  s . c  o m
 * @param a Beginning of range
 * @param b End of range
 * @param num Number of times to split range. Pass 1 if you want to split the
 *          range in two; i.e. one split.
 * @return Array of dividing values
 */
public static byte[][] split(final byte[] a, final byte[] b, final int num) {
    byte[] aPadded;
    byte[] bPadded;
    if (a.length < b.length) {
        aPadded = padTail(a, b.length - a.length);
        bPadded = b;
    } else if (b.length < a.length) {
        aPadded = a;
        bPadded = padTail(b, a.length - b.length);
    } else {
        aPadded = a;
        bPadded = b;
    }
    if (compareTo(aPadded, bPadded) >= 0) {
        throw new IllegalArgumentException("b <= a");
    }
    if (num <= 0) {
        throw new IllegalArgumentException("num cannot be < 0");
    }
    byte[] prependHeader = { 1, 0 };
    BigInteger startBI = new BigInteger(add(prependHeader, aPadded));
    BigInteger stopBI = new BigInteger(add(prependHeader, bPadded));
    BigInteger diffBI = stopBI.subtract(startBI);
    BigInteger splitsBI = BigInteger.valueOf(num + 1);
    if (diffBI.compareTo(splitsBI) < 0) {
        return null;
    }
    BigInteger intervalBI;
    try {
        intervalBI = diffBI.divide(splitsBI);
    } catch (Exception e) {
        LOG.error("Exception caught during division", e);
        return null;
    }

    byte[][] result = new byte[num + 2][];
    result[0] = a;

    for (int i = 1; i <= num; i++) {
        BigInteger curBI = startBI.add(intervalBI.multiply(BigInteger.valueOf(i)));
        byte[] padded = curBI.toByteArray();
        if (padded[1] == 0)
            padded = tail(padded, padded.length - 2);
        else
            padded = tail(padded, padded.length - 1);
        result[i] = padded;
    }
    result[num + 1] = b;
    return result;
}

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From source file:org.techytax.digipoort.XbrlNtp8Helper.java

public void addBalanceData(VatDeclarationData vatDeclarationData, VatBalanceWithinEu vatBalanceWithinEu)
        throws Exception {
    BigInteger totaleKosten = AmountHelper.roundToInteger(vatBalanceWithinEu.getTotaleKosten());
    BigInteger correction = AmountHelper.roundToInteger(vatBalanceWithinEu.getCorrection());
    BigInteger turnover = vatBalanceWithinEu.getNettoOmzet();
    BigInteger totaleBaten = AmountHelper.roundDownToInteger(
            new BigDecimal(turnover).multiply(BigDecimal.valueOf(VatType.HIGH.getValue(new Date()))));
    BigInteger vatOutEu = vatBalanceWithinEu.getVatOutEu();
    BigInteger owed = totaleBaten.add(correction).add(vatOutEu);
    BigInteger owedToBePaidBack = owed.subtract(totaleKosten.add(vatOutEu));
    vatDeclarationData.setValueAddedTaxOwed(owed);
    vatDeclarationData.setValueAddedTaxOnInput(totaleKosten.add(vatOutEu));
    vatDeclarationData.setValueAddedTaxOwedToBePaidBack(owedToBePaidBack);
    vatDeclarationData.setValueAddedTaxPrivateUse(correction);
    vatDeclarationData.setValueAddedTaxSuppliesServicesGeneralTariff(totaleBaten);
    vatDeclarationData.setTaxedTurnoverSuppliesServicesGeneralTariff(turnover);
    vatDeclarationData/*from  www.j  ava 2 s.  c o  m*/
            .setTurnoverFromTaxedSuppliesFromCountriesWithinTheEC(vatBalanceWithinEu.getTurnoverNetEu());
    vatDeclarationData.setValueAddedTaxOnSuppliesFromCountriesWithinTheEC(vatOutEu);
}

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From source file:com.twitter.elephantbird.pig.load.HBaseSlice.java

@Override
public float getProgress() throws IOException {

    // No way to know max.. just return 0. Sorry, reporting on the last slice is janky.
    // So is reporting on the first slice, by the way -- it will start out too high, possibly at 100%.
    if (endRow_.length == 0)
        return 0;
    byte[] lastPadded = m_lastRow_;
    if (m_lastRow_.length < endRow_.length) {
        lastPadded = Bytes.padTail(m_lastRow_, endRow_.length - m_lastRow_.length);
    }//from  w ww .  jav  a 2s. c om
    if (m_lastRow_.length < startRow_.length) {
        lastPadded = Bytes.padTail(m_lastRow_, startRow_.length - m_lastRow_.length);
    }
    byte[] prependHeader = { 1, 0 };
    BigInteger bigLastRow = new BigInteger(Bytes.add(prependHeader, lastPadded));
    BigDecimal processed = new BigDecimal(bigLastRow.subtract(bigStart_));
    try {
        BigDecimal progress = processed.setScale(3).divide(bigRange_, BigDecimal.ROUND_HALF_DOWN);
        return progress.floatValue();
    } catch (java.lang.ArithmeticException e) {
        return 0;
    }
}

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From source file:org.apache.accumulo.pig.Bytes.java

/**
 * Iterate over keys within the passed inclusive range.
 *//*from  w w w .ja v  a 2  s  .  co m*/
public static Iterable<byte[]> iterateOnSplits(final byte[] a, final byte[] b, final int num) {
    byte[] aPadded;
    byte[] bPadded;
    if (a.length < b.length) {
        aPadded = padTail(a, b.length - a.length);
        bPadded = b;
    } else if (b.length < a.length) {
        aPadded = a;
        bPadded = padTail(b, a.length - b.length);
    } else {
        aPadded = a;
        bPadded = b;
    }
    if (compareTo(aPadded, bPadded) >= 0) {
        throw new IllegalArgumentException("b <= a");
    }
    if (num <= 0) {
        throw new IllegalArgumentException("num cannot be < 0");
    }
    byte[] prependHeader = { 1, 0 };
    final BigInteger startBI = new BigInteger(add(prependHeader, aPadded));
    final BigInteger stopBI = new BigInteger(add(prependHeader, bPadded));
    final BigInteger diffBI = stopBI.subtract(startBI);
    final BigInteger splitsBI = BigInteger.valueOf(num + 1);
    if (diffBI.compareTo(splitsBI) < 0) {
        return null;
    }
    final BigInteger intervalBI;
    try {
        intervalBI = diffBI.divide(splitsBI);
    } catch (Exception e) {
        LOG.error("Exception caught during division", e);
        return null;
    }

    final Iterator<byte[]> iterator = new Iterator<byte[]>() {
        private int i = -1;

        @Override
        public boolean hasNext() {
            return i < num + 1;
        }

        @Override
        public byte[] next() {
            i++;
            if (i == 0) {
                return a;
            }
            if (i == num + 1) {
                return b;
            }

            BigInteger curBI = startBI.add(intervalBI.multiply(BigInteger.valueOf(i)));
            byte[] padded = curBI.toByteArray();
            if (padded[1] == 0) {
                padded = tail(padded, padded.length - 2);
            } else {
                padded = tail(padded, padded.length - 1);
            }
            return padded;
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    };

    return new Iterable<byte[]>() {
        @Override
        public Iterator<byte[]> iterator() {
            return iterator;
        }
    };
}

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From source file:localSPs.BearDataShareAPI.java

public double getStorageSize() throws IOException {
    BigInteger num = new BigInteger("1024");
    String ans = "";
    BigInteger totalMemory = new BigInteger("21474836480");
    BigInteger used;/*from www .  j av  a 2  s  .c o  m*/
    File dir = new File(ROOT_PATH);
    long totalUsed = 0; // total bytes
    List<File> files = (List<File>) FileUtils.listFiles(dir, TrueFileFilter.INSTANCE, TrueFileFilter.INSTANCE);
    for (File file : files) {
        totalUsed += file.length();
    }
    used = new BigInteger(String.valueOf(totalUsed));
    ans = totalMemory.subtract(used).divide(num).divide(num).toString();//MB
    return (Double.parseDouble(ans));
}

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