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/*
* @test
* @bug 8246774
* @summary Basic tests for ObjectMethods
* @run testng ObjectMethodsTest
* @run testng/othervm/java.security.policy=empty.policy ObjectMethodsTest
*/
import java.util.List;
import java.lang.invoke.CallSite;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.runtime.ObjectMethods;
import org.testng.annotations.Test;
import static java.lang.invoke.MethodType.methodType;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertThrows;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;
@Test
public class ObjectMethodsTest {
public static class C {
static final MethodType EQUALS_DESC = methodType(boolean.class, C.class, Object.class);
static final MethodType HASHCODE_DESC = methodType(int.class, C.class);
static final MethodType TO_STRING_DESC = methodType(String.class, C.class);
static final MethodHandle[] ACCESSORS = accessors();
static final String NAME_LIST = "x;y";
private static MethodHandle[] accessors() {
try {
return new MethodHandle[]{
MethodHandles.lookup().findGetter(C.class, "x", int.class),
MethodHandles.lookup().findGetter(C.class, "y", int.class),
};
} catch (Exception e) {
throw new AssertionError(e);
}
}
private final int x;
private final int y;
C (int x, int y) { this.x = x; this.y = y; }
public int x() { return x; }
public int y() { return y; }
}
static class Empty {
static final MethodType EQUALS_DESC = methodType(boolean.class, Empty.class, Object.class);
static final MethodType HASHCODE_DESC = methodType(int.class, Empty.class);
static final MethodType TO_STRING_DESC = methodType(String.class, Empty.class);
static final MethodHandle[] ACCESSORS = new MethodHandle[] { };
static final String NAME_LIST = "";
Empty () { }
}
static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
public void testEqualsC() throws Throwable {
CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "equals", C.EQUALS_DESC, C.class, C.NAME_LIST, C.ACCESSORS);
MethodHandle handle = cs.dynamicInvoker();
C c = new C(5, 5);
assertTrue((boolean)handle.invokeExact(c, (Object)c));
assertTrue((boolean)handle.invokeExact(c, (Object)new C(5, 5)));
assertFalse((boolean)handle.invokeExact(c, (Object)new C(5, 4)));
assertFalse((boolean)handle.invokeExact(c, (Object)new C(4, 5)));
assertFalse((boolean)handle.invokeExact(c, (Object)null));
assertFalse((boolean)handle.invokeExact(c, new Object()));
}
public void testEqualsEmpty() throws Throwable {
CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "equals", Empty.EQUALS_DESC, Empty.class, Empty.NAME_LIST, Empty.ACCESSORS);
MethodHandle handle = cs.dynamicInvoker();
Empty e = new Empty();
assertTrue((boolean)handle.invokeExact(e, (Object)e));
assertTrue((boolean)handle.invokeExact(e, (Object)new Empty()));
assertFalse((boolean)handle.invokeExact(e, (Object)null));
assertFalse((boolean)handle.invokeExact(e, new Object()));
}
public void testHashCodeC() throws Throwable {
CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "hashCode", C.HASHCODE_DESC, C.class, "x;y", C.ACCESSORS);
MethodHandle handle = cs.dynamicInvoker();
C c = new C(6, 7);
int hc = (int)handle.invokeExact(c);
assertEquals(hc, hashCombiner(c.x(), c.y()));
assertEquals((int)handle.invokeExact(new C(100, 1)), hashCombiner(100, 1));
assertEquals((int)handle.invokeExact(new C(0, 0)), hashCombiner(0, 0));
assertEquals((int)handle.invokeExact(new C(-1, 100)), hashCombiner(-1, 100));
assertEquals((int)handle.invokeExact(new C(100, 1)), hashCombiner(100, 1));
assertEquals((int)handle.invokeExact(new C(100, -1)), hashCombiner(100, -1));
}
public void testHashCodeEmpty() throws Throwable {
CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "hashCode", Empty.HASHCODE_DESC, Empty.class, "", Empty.ACCESSORS);
MethodHandle handle = cs.dynamicInvoker();
Empty e = new Empty();
assertEquals((int)handle.invokeExact(e), 0);
}
public void testToStringC() throws Throwable {
CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "toString", C.TO_STRING_DESC, C.class, C.NAME_LIST, C.ACCESSORS);
MethodHandle handle = cs.dynamicInvoker();
assertEquals((String)handle.invokeExact(new C(8, 9)), "C[x=8, y=9]" );
assertEquals((String)handle.invokeExact(new C(10, 11)), "C[x=10, y=11]" );
assertEquals((String)handle.invokeExact(new C(100, -9)), "C[x=100, y=-9]");
assertEquals((String)handle.invokeExact(new C(0, 0)), "C[x=0, y=0]" );
}
public void testToStringEmpty() throws Throwable {
CallSite cs = (CallSite)ObjectMethods.bootstrap(LOOKUP, "toString", Empty.TO_STRING_DESC, Empty.class, Empty.NAME_LIST, Empty.ACCESSORS);
MethodHandle handle = cs.dynamicInvoker();
assertEquals((String)handle.invokeExact(new Empty()), "Empty[]");
}
Class<NullPointerException> NPE = NullPointerException.class;
Class<IllegalArgumentException> IAE = IllegalArgumentException.class;
public void exceptions() {
assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "badName", C.EQUALS_DESC, C.class, C.NAME_LIST, C.ACCESSORS));
assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "toString", C.TO_STRING_DESC, C.class, "x;y;z", C.ACCESSORS));
assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "toString", C.TO_STRING_DESC, C.class, "x;y", new MethodHandle[]{}));
assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "toString", C.TO_STRING_DESC, this.getClass(), "x;y", C.ACCESSORS));
assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "toString", C.EQUALS_DESC, C.class, "x;y", C.ACCESSORS));
assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "hashCode", C.TO_STRING_DESC, C.class, "x;y", C.ACCESSORS));
assertThrows(IAE, () -> ObjectMethods.bootstrap(LOOKUP, "equals", C.HASHCODE_DESC, C.class, "x;y", C.ACCESSORS));
record NamePlusType(String mn, MethodType mt) {}
List<NamePlusType> namePlusTypeList = List.of(
new NamePlusType("toString", C.TO_STRING_DESC),
new NamePlusType("equals", C.EQUALS_DESC),
new NamePlusType("hashCode", C.HASHCODE_DESC)
);
for (NamePlusType npt : namePlusTypeList) {
assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), npt.mt(), C.class, "x;y", null));
assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), npt.mt(), C.class, "x;y", new MethodHandle[]{null}));
assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), npt.mt(), C.class, null, C.ACCESSORS));
assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), npt.mt(), null, "x;y", C.ACCESSORS));
assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, npt.mn(), null, C.class, "x;y", C.ACCESSORS));
assertThrows(NPE, () -> ObjectMethods.bootstrap(LOOKUP, null, npt.mt(), C.class, "x;y", C.ACCESSORS));
assertThrows(NPE, () -> ObjectMethods.bootstrap(null, npt.mn(), npt.mt(), C.class, "x;y", C.ACCESSORS));
}
}
// Based on the ObjectMethods internal implementation
private static int hashCombiner(int x, int y) {
return x*31 + y;
}
}