jdk/test/java/lang/invoke/MethodHandles/TestCatchException.java

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 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/**
 * @test
 * @bug 8027823
 * @run junit test.java.lang.invoke.TestCatchException
 */
package test.java.lang.invoke;

import java.lang.invoke.*;
import org.junit.*;
import static org.junit.Assert.*;

public class TestCatchException {
    final static MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
    final static MethodType M_TYPE = MethodType.methodType(int.class, Object.class, Object.class, int.class, int.class, int.class, int.class, int.class, int.class, int.class);

    private static int noThrow(Object o1, Object o2, int i1, int i2, int i3, int i4, int i5, int i6, int i7) {
        return 42;
    }

    private static int throwEx(Object o1, Object o2, int i1, int i2, int i3, int i4, int i5, int i6, int i7) throws Exception {
        throw new Exception();
    }

    private static int handler(Exception e) {
        return 17;
    }

    @Test
    public void testNoThrowPath() throws Throwable {
        MethodHandle target = LOOKUP.findStatic(TestCatchException.class, "noThrow", M_TYPE);
        MethodHandle handler = LOOKUP.findStatic(TestCatchException.class, "handler", MethodType.methodType(int.class, Exception.class));

        MethodHandle h = MethodHandles.catchException(target, Exception.class, handler);

        int x = (int)h.invokeExact(new Object(), new Object(), 1, 2, 3, 4, 5, 6, 7);
        assertEquals(x, 42);
    }

    @Test
    public void testThrowPath() throws Throwable {
        MethodHandle target = LOOKUP.findStatic(TestCatchException.class, "throwEx", M_TYPE);
        MethodHandle handler = LOOKUP.findStatic(TestCatchException.class, "handler", MethodType.methodType(int.class, Exception.class));

        MethodHandle h = MethodHandles.catchException(target, Exception.class, handler);

        int x = (int)h.invokeExact(new Object(), new Object(), 1, 2, 3, 4, 5, 6, 7);
        assertEquals(x, 17);
    }


    public static Object m1(Object o1, Object o2, Object o3, Object o4, Object o5,
                            Object o6, Object o7, Object o8, Object... tail) {
        return tail;
    }

    public static Object m2(Exception e, Object o1, Object o2, Object o3, Object o4,
                            Object o5, Object o6, Object o7, Object o8, Object... tail) {
        return tail;
    }

    @Test
    public void testVarargsCollector() throws Throwable {
        MethodType t1 = MethodType.methodType(Object.class, Object.class, Object.class, Object.class, Object.class,
                Object.class, Object.class, Object.class, Object.class, Object[].class);

        MethodType t2 = t1.insertParameterTypes(0, Exception.class);

        MethodHandle target = LOOKUP.findStatic(TestCatchException.class, "m1", t1)
                                    .asVarargsCollector(Object[].class);

        MethodHandle catcher = LOOKUP.findStatic(TestCatchException.class, "m2", t2);

        MethodHandle gwc = MethodHandles.catchException(target, Exception.class, catcher);

        Object o = new Object();
        Object[] obj1 = new Object[] { "str" };

        Object r1 = target.invokeExact(o, o, o, o, o, o, o, o, obj1);
        Object r2 = gwc.invokeExact(o, o, o, o, o, o, o, o, obj1);
        assertEquals(r1, obj1);
        assertEquals(r2, obj1);
    }

    public static void main(String[] args) throws Throwable {
        TestCatchException test = new TestCatchException();
        test.testNoThrowPath();
        test.testThrowPath();
        test.testVarargsCollector();
        System.out.println("TEST PASSED");
    }
}