149 lines
3.9 KiB
Java
149 lines
3.9 KiB
Java
/**
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* Serene (simple) - A PoC lisp to collect data on Serenes concepts
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* Copyright (C) 2019-2020 Sameer Rahmani <lxsameer@gnu.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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package serene.simple;
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import serene.simple.SereneException;
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public class SNumber {
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public static interface IOps {
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public IOps add(Object x);
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public IOps add(Double x);
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public IOps add(Long x);
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public IOps subtract(Object x);
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public IOps subtract(Double x);
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public IOps subtract(Long x);
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public Object value();
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}
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public static class LongNumber implements IOps {
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private long v;
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public LongNumber() {
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this.v = 0;
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}
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public LongNumber(long v) {
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this.v = v;
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}
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public IOps add(Object x) throws SereneException {
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if (x instanceof Long) {
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return this.add((long) x);
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}
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else if (x instanceof Double) {
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return this.add((Double) x);
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}
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throw new SereneException("Can't cast anything beside Long and Double");
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}
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public IOps add(Long x) {
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return new LongNumber(this.v + x);
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}
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public IOps add(Double x) {
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DoubleNumber y = new DoubleNumber(x);
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return y.add(this.v);
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}
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public IOps subtract(Object x) throws SereneException {
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if (x instanceof Long) {
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return this.subtract((long) x);
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}
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else if (x instanceof Double) {
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return this.subtract((Double) x);
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}
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throw new SereneException("Can't cast anything beside Long and Double");
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}
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public IOps subtract(Long x) {
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return new LongNumber(this.v - x);
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}
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public IOps subtract(Double x) {
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DoubleNumber y = new DoubleNumber(x);
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return y.subtract(this.v);
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}
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public Object value() {
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return this.v;
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}
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}
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public static class DoubleNumber implements IOps {
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private Double v;
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public DoubleNumber(Double v) {
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this.v = v;
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}
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public IOps add(Object x) throws SereneException {
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if (x instanceof Long) {
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return this.add((long) x);
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}
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else if (x instanceof Double) {
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return this.add((Double) x);
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}
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throw new SereneException("Can't cast anything beside Long and Double");
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}
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public IOps add(Double x) {
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return new DoubleNumber(this.v + x);
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}
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public IOps add(Long x) {
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return new DoubleNumber(this.v + x.doubleValue());
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}
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public IOps subtract(Object x) throws SereneException {
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if (x instanceof Long) {
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return this.subtract((long) x);
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}
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else if (x instanceof Double) {
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return this.subtract((Double) x);
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}
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throw new SereneException("Can't cast anything beside Long and Double");
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}
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public IOps subtract(Double x) {
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return new DoubleNumber(this.v - x);
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}
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public IOps subtract(Long x) {
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return new DoubleNumber(this.v - x.doubleValue());
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}
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public Object value() {
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return this.v;
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}
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}
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public static IOps createNumber(Object num) {
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if (num instanceof Long) {
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return new SNumber.LongNumber((long) num);
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}
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else if (num instanceof Double) {
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return new SNumber.DoubleNumber((Double) num);
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}
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throw new SereneException("Can't cast anything beside Long and Double");
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}
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}
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