Quelle ClassSpecializerTest.java Sprache: JAVA

/*
* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
* 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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*/

/* @test
* @summary Smoke-test class specializer, used to create BoundMethodHandle classes
* @compile/module=java.base java/lang/invoke/ClassSpecializerHelper.java
* @run testng/othervm/timeout=250 -ea -esa ClassSpecializerTest
*/

// Useful diagnostics to try:
//   -Djava.lang.invoke.MethodHandle.TRACE_RESOLVE=true
//   -Djava.lang.invoke.MethodHandle.DUMP_CLASS_FILES=true

import org.testng.annotations.*;
import java.lang.invoke.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static java.lang.invoke.ClassSpecializerHelper.*;

public class ClassSpecializerTest {
    @Test
    public void testFindSpecies() throws Throwable {
        System.out.println("testFindSpecies");
        System.out.println("test = " + SPEC_TEST);
        ArrayList<Object> args = new ArrayList<>();
        for (int key = 0; key <= Kind.MAX_KEY; key++) {
            Kind k = SpecTest.kind(key);
            System.out.println("k = " + k);
            MethodHandle mh = k.factory();
            System.out.println("k.f = " + mh);
            args.clear();
            for (Class<?> pt : mh.type().parameterList()) {
                args.add(coughUpA(pt));
            }
            args.set(0, key * 1000 + 42);
            Frob f = (Frob) mh.invokeWithArguments(args.toArray());
            assert(f.kind() == k);
            System.out.println("k.f(...) = " + f.toString());
            List<Object> l = f.asList();
            System.out.println("f.l = " + l);
            args.subList(0,1).clear();  // drop label
            assert(args.equals(l));
        }
    }
    private static Object coughUpA(Class<?> pt) throws Throwable {
        if (pt == String.class)  return "foo";
        if (pt.isArray()) return java.lang.reflect.Array.newInstance(pt.getComponentType(), 2);
        if (pt == Integer.class)  return 42;
        if (pt == Double.class)  return 3.14;
        if (pt.isAssignableFrom(List.class))
            return Arrays.asList("hello", "world", "from", pt.getSimpleName());
        return MethodHandles.zero(pt).invoke();
    }
    public static void main(String... av) throws Throwable {
        System.out.println("TEST: ClassSpecializerTest");
        new ClassSpecializerTest().testFindSpecies();
    }
}

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