Example usage for java.math BigInteger ONE

Introduction

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

Prototype

BigInteger ONE

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Document

The BigInteger constant one.

Usage

From source file:cc.redberry.core.number.Exponentiation.java

static BigInteger findIntegerRoot(BigInteger base, BigInteger power) {
    BigInteger maxBits = BigInteger.valueOf(base.bitLength() + 1); // base < 2 ^ (maxBits + 1)
    // => base ^ ( 1 / power ) < 2 ^ ( (maxBits + 1) / power )

    BigInteger[] divResult = maxBits.divideAndRemainder(power);
    if (divResult[1].signum() == 0) // i.e. divResult[1] == 0
        maxBits = divResult[0];/*from www  . j a v  a  2s.  c o m*/
    else
        maxBits = divResult[0].add(BigInteger.ONE);

    if (maxBits.bitLength() > 31)
        throw new RuntimeException("Too many bits...");

    int targetBitsNumber = maxBits.intValue();
    int resultLengthM1 = targetBitsNumber / 8 + 1; //resultLength minus one
    byte[] result = new byte[resultLengthM1];
    resultLengthM1--;

    int bitNumber = targetBitsNumber;

    int cValue;
    BigInteger testValue;

    while ((--bitNumber) >= 0) {
        //setting bit
        result[resultLengthM1 - (bitNumber >> 3)] |= 1 << (bitNumber & 0x7);

        //Testing
        testValue = new BigInteger(result);
        cValue = ArithmeticUtils.pow(testValue, power).compareTo(base);
        if (cValue == 0)
            return testValue;
        if (cValue > 0)
            result[resultLengthM1 - (bitNumber >> 3)] &= ~(1 << (bitNumber & 0x7));
    }

    return null;
}

From source file:cherry.foundation.type.SecureBigIntegerTest.java

@Test
public void testNoneEncoder() {
    Encoder<BigInteger> encoder = new SecureBigInteger.NoneEncoder();
    assertThat(encoder.encode(null), is(nullValue()));
    assertThat(encoder.encode(BigInteger.ONE), is("1"));
    assertThat(encoder.decode(null), is(nullValue()));
    assertThat(encoder.decode("1"), is(BigInteger.ONE));
}

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  w  w .jav  a2s . c  o m
    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);
}

From source file:org.apache.accumulo.server.master.tableOps.Utils.java

static String getNextTableId(String tableName, Instance instance) throws ThriftTableOperationException {

    String tableId = null;//from   www  . j  a v  a 2s.  c  o  m
    try {
        IZooReaderWriter zoo = ZooReaderWriter.getRetryingInstance();
        final String ntp = ZooUtil.getRoot(instance) + Constants.ZTABLES;
        byte[] nid = zoo.mutate(ntp, "0".getBytes(), ZooUtil.PUBLIC, new Mutator() {
            @Override
            public byte[] mutate(byte[] currentValue) throws Exception {
                BigInteger nextId = new BigInteger(new String(currentValue), Character.MAX_RADIX);
                nextId = nextId.add(BigInteger.ONE);
                return nextId.toString(Character.MAX_RADIX).getBytes();
            }
        });
        return new String(nid);
    } catch (Exception e1) {
        Logger.getLogger(CreateTable.class).error("Failed to assign tableId to " + tableName, e1);
        throw new ThriftTableOperationException(tableId, tableName, TableOperation.CREATE,
                TableOperationExceptionType.OTHER, e1.getMessage());
    }
}

From source file:co.rsk.remasc.RemascStorageProviderTest.java

@Test
public void setAndGetRewardBalance() {
    String accountAddress = randomAddress();
    Repository repository = new RepositoryImpl();

    RemascStorageProvider provider = new RemascStorageProvider(repository, accountAddress);

    provider.setRewardBalance(BigInteger.ONE);

    Assert.assertEquals(BigInteger.ONE, provider.getRewardBalance());
}

From source file:org.eclipse.equinox.p2.cudf.solver.TrendyOptimizationFunction.java

public List<WeightedObject<Object>> createOptimizationFunction(InstallableUnit metaIu) {
    List<WeightedObject<Object>> weightedObjects = new ArrayList<WeightedObject<Object>>();
    BigInteger weight = BigInteger.valueOf(slice.size() + 1);
    removed(weightedObjects, weight.multiply(weight).multiply(weight), metaIu);
    notuptodate(weightedObjects, weight.multiply(weight), metaIu);
    optional(weightedObjects, weight, metaIu);
    niou(weightedObjects, BigInteger.ONE, metaIu);
    if (!weightedObjects.isEmpty()) {
        return weightedObjects;
    }/*from w  w  w. jav a2 s  . c  om*/
    return null;
}

From source file:org.spring.cache.CachingWithGeodeIntegrationTest.java

@Test
public void aCacheMisses() {
    assertThat(mathService.factorial(BigInteger.valueOf(0)), is(equalTo(BigInteger.ONE)));
    assertThat(mathService.wasCacheMiss(), is(true));
    assertThat(mathService.factorial(BigInteger.valueOf(1)), is(equalTo(BigInteger.ONE)));
    assertThat(mathService.wasCacheMiss(), is(true));
    assertThat(mathService.factorial(BigInteger.valueOf(2)), is(equalTo(MathService.TWO)));
    assertThat(mathService.wasCacheMiss(), is(true));
    assertThat(mathService.factorial(BigInteger.valueOf(4)), is(equalTo(BigInteger.valueOf(24))));
    assertThat(mathService.wasCacheMiss(), is(true));
    assertThat(mathService.factorial(BigInteger.valueOf(8)), is(equalTo(BigInteger.valueOf(40320))));
    assertThat(mathService.wasCacheMiss(), is(true));
}

From source file:cc.redberry.core.number.NumberUtils.java

private static boolean isSqrtXXX(BigInteger n, BigInteger root) {
    final BigInteger lowerBound = root.pow(2);
    final BigInteger upperBound = root.add(BigInteger.ONE).pow(2);
    return lowerBound.compareTo(n) <= 0 && n.compareTo(upperBound) < 0;
}

From source file:Mersenne.java

public Mersenne(int index) {
    this.index = index;
    value = two.pow(Integer.parseInt(primes[index - 1]));
    value = value.subtract(BigInteger.ONE);
}

From source file:org.apache.accumulo.master.tableOps.Utils.java

static String getNextTableId(String tableName, Instance instance) throws ThriftTableOperationException {

    String tableId = null;//  w  ww.j  a  v a2s. c o m
    try {
        IZooReaderWriter zoo = ZooReaderWriter.getRetryingInstance();
        final String ntp = ZooUtil.getRoot(instance) + Constants.ZTABLES;
        byte[] nid = zoo.mutate(ntp, ZERO_BYTE, ZooUtil.PUBLIC, new Mutator() {
            @Override
            public byte[] mutate(byte[] currentValue) throws Exception {
                BigInteger nextId = new BigInteger(new String(currentValue, Constants.UTF8),
                        Character.MAX_RADIX);
                nextId = nextId.add(BigInteger.ONE);
                return nextId.toString(Character.MAX_RADIX).getBytes(Constants.UTF8);
            }
        });
        return new String(nid, Constants.UTF8);
    } catch (Exception e1) {
        Logger.getLogger(CreateTable.class).error("Failed to assign tableId to " + tableName, e1);
        throw new ThriftTableOperationException(tableId, tableName, TableOperation.CREATE,
                TableOperationExceptionType.OTHER, e1.getMessage());
    }
}