/*

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

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import static java.math.BigInteger.ONE;

import java.math.BigInteger;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

import java.util.Random;

/**

 * @test

 * @bug 7131192

 * @summary This test ensures that BigInteger.floatValue() and

 *          BigInteger.doubleValue() behave correctly.

 * @author Louis Wasserman

 */

public class PrimitiveConversionTests {

    static final List<BigInteger> ALL_BIGINTEGER_CANDIDATES;

    static {

        List<BigInteger> samples = new ArrayList<>();

        // Now add values near 2^N for lots of values of N.

        for (int exponent : Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7, 31, 32, 33,

                34, 62, 63, 64, 65, 71, 72, 73, 79, 80, 81, 255, 256, 257, 511,

                512, 513, Double.MAX_EXPONENT - 1, Double.MAX_EXPONENT,

                Double.MAX_EXPONENT + 1, 2000, 2001, 2002)) {

            BigInteger x = ONE.shiftLeft(exponent);

            for (BigInteger y : Arrays.asList(x, x.add(ONE), x.subtract(ONE))) {

                samples.add(y);

                samples.add(y.negate());

            }

        }

        Random rng = new Random(1234567);

        for (int i = 0; i < 2000; i++) {

            samples.add(new BigInteger(rng.nextInt(2000), rng));

        }

        ALL_BIGINTEGER_CANDIDATES = Collections.unmodifiableList(samples);

    }

    public static int testDoubleValue() {

        int failures = 0;

        for (BigInteger big : ALL_BIGINTEGER_CANDIDATES) {

            double expected = Double.parseDouble(big.toString());

            double actual = big.doubleValue();

            // should be bitwise identical

            if (Double.doubleToRawLongBits(expected) != Double

                    .doubleToRawLongBits(actual)) {

                System.out.println(big);

                failures++;

            }

        }

        return failures;

    }

    public static int testFloatValue() {

        int failures = 0;

        for (BigInteger big : ALL_BIGINTEGER_CANDIDATES) {

            float expected = Float.parseFloat(big.toString());

            float actual = big.floatValue();

            // should be bitwise identical

            if (Float.floatToRawIntBits(expected) != Float

                    .floatToRawIntBits(actual)) {

                System.out.println(big + " " + expected + " " + actual);

                failures++;

            }

        }

        return failures;

    }

    public static void main(String[] args) {

        int failures = testDoubleValue();

        failures += testFloatValue();

        if (failures > 0) {

            throw new RuntimeException("Incurred " + failures

                    + " failures while testing primitive conversions.");

        }

    }

}