jdk-24/jdk/test/java/lang/invoke/MaxTest.java

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/* @test
 * @summary BoundMethodHandle tests with primitive types
 * @compile MaxTest.java
 * @run junit/othervm test.java.lang.invoke.MaxTest
 */

package test.java.lang.invoke;

import static org.junit.Assert.assertEquals;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;

import org.junit.Test;

public class MaxTest {

    static MethodHandles.Lookup LOOKUP = MethodHandles.lookup();

    private MethodHandle getMax(Class<?> t) throws Throwable {
        return LOOKUP.findStatic(Math.class, "max", MethodType.methodType(t, t, t));
    }

    static int ITERATION_COUNT = 40000;
    static {
        String iterations = System.getProperty(MaxTest.class.getSimpleName() + ".ITERATION_COUNT");
        if (iterations == null) {
            iterations = System.getProperty(MaxTest.class.getName() + ".ITERATION_COUNT");
        }
        if (iterations != null) {
            ITERATION_COUNT = Integer.parseInt(iterations);
        }
    }

    @Test
    public void testMaxLong() throws Throwable {
        final Class<?> C = long.class;
        final long P = 23L;
        final long Q = 42L;
        final long R = Math.max(P, Q);
        for (int i = 0; i < ITERATION_COUNT; ++i) {
            MethodHandle h = getMax(C);
            assertEquals((long) h.invokeExact(P, Q), R);
            MethodHandle bh = MethodHandles.insertArguments(h, 0, P);
            assertEquals((long) bh.invokeExact(Q), R);
            MethodHandle bbh = MethodHandles.insertArguments(bh, 0, Q);
            assertEquals((long) bbh.invokeExact(), R);
            MethodHandle b2h = MethodHandles.insertArguments(h, 1, Q);
            assertEquals((long) b2h.invokeExact(P), R);
            MethodHandle bb2h = MethodHandles.insertArguments(b2h, 0, P);
            assertEquals((long) bb2h.invokeExact(), R);
        }
    }

    @Test
    public void testMaxInt() throws Throwable {
        final Class<?> C = int.class;
        final int P = 23;
        final int Q = 42;
        final int R = Math.max(P, Q);
        for (int i = 0; i < ITERATION_COUNT; ++i) {
            MethodHandle h = getMax(C);
            assertEquals((int) h.invokeExact(P, Q), R);
            MethodHandle bh = MethodHandles.insertArguments(h, 0, P);
            assertEquals((int) bh.invokeExact(Q), R);
            MethodHandle bbh = MethodHandles.insertArguments(bh, 0, Q);
            assertEquals((int) bbh.invokeExact(), R);
            MethodHandle b2h = MethodHandles.insertArguments(h, 1, Q);
            assertEquals((int) b2h.invokeExact(P), R);
            MethodHandle bb2h = MethodHandles.insertArguments(b2h, 0, P);
            assertEquals((int) bb2h.invokeExact(), R);
        }
    }

    @Test
    public void testMaxFloat() throws Throwable {
        final Class<?> C = float.class;
        final float P = 23F;
        final float Q = 42F;
        final float R = Math.max(P, Q);
        final float D = 0.1F;
        for (int i = 0; i < ITERATION_COUNT; ++i) {
            MethodHandle h = getMax(C);
            assertEquals((float) h.invokeExact(P, Q), R, D);
            MethodHandle bh = MethodHandles.insertArguments(h, 0, P);
            assertEquals((float) bh.invokeExact(Q), R, D);
            MethodHandle bbh = MethodHandles.insertArguments(bh, 0, Q);
            assertEquals((float) bbh.invokeExact(), R, D);
            MethodHandle b2h = MethodHandles.insertArguments(h, 1, Q);
            assertEquals((float) b2h.invokeExact(P), R, D);
            MethodHandle bb2h = MethodHandles.insertArguments(b2h, 0, P);
            assertEquals((float) bb2h.invokeExact(), R, D);
        }
    }

    @Test
    public void testMaxDouble() throws Throwable {
        final Class<?> C = double.class;
        final double P = 23F;
        final double Q = 42F;
        final double R = Math.max(P, Q);
        final double D = 0.1;
        for (int i = 0; i < ITERATION_COUNT; ++i) {
            MethodHandle h = getMax(C);
            assertEquals((double) h.invokeExact(P, Q), R, D);
            MethodHandle bh = MethodHandles.insertArguments(h, 0, P);
            assertEquals((double) bh.invokeExact(Q), R, D);
            MethodHandle bbh = MethodHandles.insertArguments(bh, 0, Q);
            assertEquals((double) bbh.invokeExact(), R, D);
            MethodHandle b2h = MethodHandles.insertArguments(h, 1, Q);
            assertEquals((double) b2h.invokeExact(P), R, D);
            MethodHandle bb2h = MethodHandles.insertArguments(b2h, 0, P);
            assertEquals((double) bb2h.invokeExact(), R, D);
        }
    }

}