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package org.psjava.ds.numbersystrem;

import java.math.BigInteger;

public class BigIntegerNumberSystem implements IntegerDivisableNumberSystem {

	private static final BigIntegerNumberSystem INSTANCE = new BigIntegerNumberSystem();

	public static BigIntegerNumberSystem getInstance() {
		return INSTANCE;
	}

	private BigIntegerNumberSystem() {
	}

	@Override
	public BigInteger getZero() {
		return BigInteger.ZERO;
	}

	@Override
	public BigInteger getByInt(int v) {
		return BigInteger.valueOf(v);
	}

	@Override
	public boolean isPositive(BigInteger v) {
		return v.signum() > 0;
	}

	@Override
	public boolean isZero(BigInteger v) {
		return v.signum() == 0;
	}

	@Override
	public boolean isNegative(BigInteger v) {
		return v.signum() < 0;
	}

	@Override
	public int getSign(BigInteger v) {
		return v.signum();
	}

	@Override
	public boolean areEqual(BigInteger o1, BigInteger o2) {
		return o1.equals(o2);
	}

	@Override
	public BigInteger getOne() {
		return BigInteger.ONE;
	}

	@Override
	public boolean isOne(BigInteger v) {
		return v.equals(BigInteger.ONE);
	}

	@Override
	public BigInteger add(BigInteger v1, BigInteger v2) {
		return v1.add(v2);
	}

	@Override
	public BigInteger subtract(BigInteger minuend, BigInteger subtrahend) {
		return minuend.subtract(subtrahend);
	}

	@Override
	public BigInteger multiply(BigInteger v1, BigInteger v2) {
		return v1.multiply(v2);
	}

	@Override
	public BigInteger integerDivide(BigInteger dividend, BigInteger divisor) {
		return dividend.divide(divisor);
	}

	@Override
	public BigInteger integerRemainder(BigInteger dividend, BigInteger divisor) {
		return dividend.remainder(divisor);
	}

	@Override
	public int compare(BigInteger o1, BigInteger o2) {
		return o1.compareTo(o2);
	}

}