org.decimal4j.arithmetic.JDKSupport Maven / Gradle / Ivy
Show all versions of decimal4j Show documentation
/**
* The MIT License (MIT)
*
* Copyright (c) 2015-2016 decimal4j (tools4j), Marco Terzer
*
* 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.decimal4j.arithmetic;
import java.math.BigInteger;
/**
* Provides ports of methods that are available in JDK 1.8 to make code run in
* earlier JDK's.
*/
public final class JDKSupport {
/**
* Copied from {@code BigInteger.longValueExact()} added in Java 1.8.
*
* Converts the {@code BigInteger} argument to a {@code long}, checking for lost
* information. If the value of this {@code BigInteger} is out of the range
* of the {@code long} type, then an {@code ArithmeticException} is thrown.
*
* @param value the {@code BigInteger} value to convert to a long
* @return {@code value} converted to a {@code long}.
* @throws ArithmeticException
* if the {@code value} will not exactly fit in a {@code long}.
* @since JDK 1.8
*/
public static final long bigIntegerToLongValueExact(BigInteger value) {
if (value.bitLength() <= 63) return value.longValue();
else throw new ArithmeticException("BigInteger out of long range: " + value);
}
// no instances
private JDKSupport() {
}
}