com.matthewmitchell.peercoinj.shapeshift.ShapeShiftMonetary.java Source code

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Here is the source code for com.matthewmitchell.peercoinj.shapeshift.ShapeShiftMonetary.java

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/*
 * Copyright (C) 2015 NuBits Developers
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.matthewmitchell.peercoinj.shapeshift;

import static com.google.common.math.IntMath.pow;
import com.google.common.math.LongMath;
import com.matthewmitchell.peercoinj.core.Coin;
import com.matthewmitchell.peercoinj.core.Monetary;
import com.matthewmitchell.peercoinj.utils.MonetaryFormat;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;

/**
 * A ShapeShiftMonetary is a {@link com.matthewmitchell.peercoinj.core.Monetary} implementation for ShapeShift coins
 *
 * @author Matthew Mitchell
 */
public class ShapeShiftMonetary implements Monetary {

    private final int smallestUnitExponent;
    private long value;
    private transient MonetaryFormat plainFormat;

    private void setFormat() {
        plainFormat = new MonetaryFormat().shift(0).minDecimals(0).repeatOptionalDecimals(1, smallestUnitExponent)
                .noCode();
    }

    /**
     * Constructs a ShapeShiftMonetary instance given a monetary amount and the number of decimal places.
     */
    public ShapeShiftMonetary(long value, int smallestUnitExponent) {
        this.value = value;
        this.smallestUnitExponent = smallestUnitExponent;
        setFormat();
    }

    public ShapeShiftMonetary(Coin coin, Coin rate, int smallestUnitExponent) {
        this(coin.value * pow(10, smallestUnitExponent) / rate.value, smallestUnitExponent);
    }

    public ShapeShiftMonetary(Coin coin, ShapeShiftMonetary rate, int smallestUnitExponent) {
        this(coin.value * rate.value / pow(10, coin.smallestUnitExponent()), smallestUnitExponent);
    }

    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        in.defaultReadObject();
        setFormat();
    }

    @Override
    public int smallestUnitExponent() {
        return smallestUnitExponent;
    }

    @Override
    public long getValue() {
        return value;
    }

    @Override
    public int signum() {
        if (this.value == 0)
            return 0;
        return this.value < 0 ? -1 : 1;
    }

    @Override
    public String toPlainString() {
        return plainFormat.format(this).toString();
    }

    public void subEqual(ShapeShiftMonetary operand) {
        this.value -= operand.value;
    }

    private BigInteger getBigIntegerOne() {
        return BigInteger.valueOf(LongMath.pow(10, smallestUnitExponent));
    }

    private BigInteger toBigInteger() {
        return BigInteger.valueOf(value);
    }

    private Coin convertedToCoin(BigInteger converted) {

        if (converted.compareTo(BigInteger.valueOf(Long.MAX_VALUE)) > 0
                || converted.compareTo(BigInteger.valueOf(0)) < 0)
            throw new ArithmeticException("Out of range");
        try {
            return Coin.valueOf(converted.longValue());
        } catch (IllegalArgumentException x) {
            throw new ArithmeticException("Out of range: " + x.getMessage());
        }

    }

    public Coin toCoinRate() {

        final BigInteger converted = getBigIntegerOne().multiply(BigInteger.valueOf(Coin.COIN.value))
                .divide(BigInteger.valueOf(value));
        return convertedToCoin(converted);

    }

    public Coin toCoinUsingRate(Coin rate) {

        final BigInteger converted = toBigInteger().multiply(BigInteger.valueOf(rate.value))
                .divide(getBigIntegerOne());
        return convertedToCoin(converted);

    }

}