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jBasics is a collection of useful utility classes for Java. This includes helper for XML, mathematic functions, restful web services helper, pattern oriented programming interfaces and more. Currently Java7 and up is supported. Version 1.0 will required at leaset Java8.

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/*
 * Copyright (c) 2009-2015
 * 	IT-Consulting Stephan Schloepke (http://www.schloepke.de/)
 * 	klemm software consulting Mirko Klemm (http://www.klemm-scs.com/)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.jbasics.math;

import org.jbasics.types.tuples.Pair;

import java.math.BigDecimal;
import java.math.BigInteger;

public class NumberConverter {

	public static BigRational toBigRational(final Number number) {
		return BigRational.valueOf(number);
	}

	public static BigDecimal toBigDecimal(final Number number) {
		BigDecimal result = null;
		if (number == null) {
			return null;
		} else if (number instanceof BigDecimal) {
			result = (BigDecimal) number;
		} else if (number instanceof BigRational) {
			result = ((BigRational) number).decimalValue();
		} else if (number instanceof Double || number instanceof Float) {
			result = BigDecimal.valueOf(number.doubleValue());
		} else if (number instanceof BigInteger) {
			result = new BigDecimal((BigInteger) number);
		} else if (number instanceof Long || number instanceof Integer || number instanceof Byte) {
			result = BigDecimal.valueOf(number.longValue());
		} else if (number != null) {
			result = BigDecimal.valueOf(number.doubleValue());
		}
		if (BigDecimal.ZERO.compareTo(result) == 0) {
			return BigDecimal.ZERO;
		} else if (BigDecimal.ONE.compareTo(result) == 0) {
			return BigDecimal.ONE;
		} else {
			return result;
		}
	}

	public static BigInteger toBigInteger(final Number number) {
		if (number == null) {
			return null;
		} else if (number instanceof BigInteger) {
			return (BigInteger) number;
		} else if (number instanceof BigDecimal) {
			return ((BigDecimal) number).toBigInteger();
		} else if (number instanceof BigRational) {
			return ((BigRational) number).toBigInteger();
		} else {
			return BigInteger.valueOf(number.longValue());
		}
	}

	public static BigInteger toBigInteger(final String number) {
		if (number == null) {
			return null;
		}
		final Pair trimedRadixPair = NumberConverter.trimAndDetachRadixPrefix(number);
		return new BigInteger(trimedRadixPair.first(), trimedRadixPair.second().intValue());
	}

	public static Pair trimAndDetachRadixPrefix(final String input) {
		if (input == null) {
			return null;
		}
		final String temp = input.trim();
		if (temp.startsWith("0x")) {
			return new Pair(temp.substring(2), 16);
			//		} else if (temp.length() > 1 && temp.startsWith("0")) {
			//			return new Pair(temp.substring(1), 8);
		} else if (temp.startsWith("0b")) {
			return new Pair(temp.substring(2), 2);
		} else {
			return new Pair(temp, 10);
		}
	}
}