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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.arbitrary.constants;

import org.jbasics.math.arbitrary.ArbitraryInteger;
import org.jbasics.math.arbitrary.ArbitraryNumber;
import org.jbasics.math.arbitrary.ArbitraryRational;

public class One implements ArbitraryNumber {
	public static final One INSTANCE = new One();

	private One() {
		// To disallow instantiation
	}

	// Converting

	@SuppressWarnings("boxing")
	public Integer toNumber() {
		return 1;
	}

	// Checking

	public int signum() {
		return 1;
	}

	public boolean isNegativ() {
		return false;
	}

	public boolean isPositiv() {
		return true;
	}

	public boolean isZero() {
		return false;
	}

	// Unary operations

	public ArbitraryNumber abs() {
		return this;
	}

	public ArbitraryNumber negate() {
		return MinusOne.INSTANCE;
	}

	public ArbitraryNumber reciprocal() {
		throw new ArithmeticException("Division by zero");
	}

	public ArbitraryNumber square() {
		return this;
	}

	public ArbitraryNumber increment() {
		return ArbitraryInteger.valueOf(2);
	}

	public ArbitraryNumber decrement() {
		return Zero.INSTANCE;
	}

	// Binary Operations

	public ArbitraryNumber add(ArbitraryInteger summand) {
		return summand.increment();
	}

	public ArbitraryNumber subtract(ArbitraryInteger subtrahend) {
		return subtrahend.negate().increment();
	}

	public ArbitraryNumber multiply(ArbitraryInteger factor) {
		return factor;
	}

	public ArbitraryNumber divide(ArbitraryInteger divisor) {
		return divisor.reciprocal();
	}

	public ArbitraryNumber add(ArbitraryRational summand) {
		return summand.increment();
	}

	public ArbitraryNumber subtract(ArbitraryRational subtrahend) {
		return subtrahend.negate().increment();
	}

	public ArbitraryNumber multiply(ArbitraryRational factor) {
		return factor;
	}

	public ArbitraryNumber divide(ArbitraryRational divisor) {
		return divisor.reciprocal();
	}
}