io.vertx.sqlclient.data.Numeric Maven / Gradle / Ivy
/*
* Copyright (C) 2018 Julien Viet
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package io.vertx.sqlclient.data;
import java.math.BigDecimal;
import java.math.BigInteger;
/**
* An arbitrary number that supports NaN.
*/
public final class Numeric extends Number {
/**
* Constant for the {@code NaN} value.
*/
public static final Numeric NaN = new Numeric(Double.NaN);
private final Number value;
/**
* Return a {@code Numeric} instance for the given {@code number}.
*
* Null values or infinite {@code Double} or {@code Float} are rejected.
*
* @param number the number
* @return the {@code Numeric} value
* @throws NumberFormatException when the number is infinite
*/
public static Numeric create(Number number) {
if (number == null) {
throw new NullPointerException();
}
if (number instanceof Double && ((Double)number).isInfinite() || number instanceof Float && ((Float)number).isInfinite()) {
throw new NumberFormatException("Infinite numbers are not valid numerics");
}
return new Numeric(number);
}
/**
* Parse and return a {@code Numeric} instance for the given {@code s}.
*
* The string {@code "Nan"} will return the {@link #NaN} instance.
*
* @param s the string
* @return the {@code Numeric} value
*/
public static Numeric parse(String s) {
switch (s) {
case "NaN":
return NaN;
default:
return new Numeric(new BigDecimal(s));
}
}
private Numeric(Number value) {
this.value = value;
}
@Override
public short shortValue() {
return value.shortValue();
}
@Override
public int intValue() {
return value.intValue();
}
@Override
public long longValue() {
return value.longValue();
}
@Override
public float floatValue() {
return value.floatValue();
}
@Override
public double doubleValue() {
return value.doubleValue();
}
/**
* @return {@code true} when this number represents {@code NaN}
*/
public boolean isNaN() {
return value instanceof Double && ((Double)value).isNaN() || value instanceof Float && ((Float)value).isNaN();
}
/**
* @return the numeric value represented by this object after conversion
* to type {@code BigDecimal}. It can be {@code null} when this instance
* represents the {@code NaN} value.
*/
public BigDecimal bigDecimalValue() {
if (value instanceof BigDecimal) {
return (BigDecimal) value;
} else if (value instanceof BigInteger) {
return new BigDecimal((BigInteger)value);
} else if (isNaN()) {
return null;
} else {
return new BigDecimal(value.toString());
}
}
/**
* @return the numeric value represented by this object after conversion
* to type {@code BigInteger}. It can be {@code null} when this instance
* represents the {@code NaN} value.
*/
public BigInteger bigIntegerValue() {
if (value instanceof BigInteger) {
return (BigInteger) value;
} else if (value instanceof BigDecimal) {
return ((BigDecimal)value).toBigInteger();
} else if (isNaN()) {
return null;
} else {
return new BigInteger(Long.toString(value.longValue()));
}
}
@Override
public boolean equals(Object obj) {
if (obj instanceof Numeric) {
Numeric that = (Numeric) obj;
if (value.getClass() == that.value.getClass()) {
return value.equals(that.value);
} else {
BigDecimal l = bigDecimalValue();
BigDecimal r = that.bigDecimalValue();
if (l == null) {
return r == null;
} else if (r == null) {
return false;
}
return l.compareTo(r) == 0;
}
}
return false;
}
@Override
public int hashCode() {
return intValue();
}
@Override
public String toString() {
return value.toString();
}
}