/*

 * Copyright (c) 2015, 2016, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

/* @test

 */

package test.java.lang.invoke;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.MethodHandles;

import java.lang.invoke.MethodHandles.Lookup;

import java.lang.invoke.MethodType;

import static java.lang.invoke.MethodType.methodType;

import static org.testng.AssertJUnit.*;

import org.testng.annotations.*;

/**

 * Tests for the tryFinally method handle combinator introduced in JEP 274.

 */

public class TryFinallyTest {

    static final Lookup LOOKUP = MethodHandles.lookup();

    @Test

    public static void testTryFinally() throws Throwable {

        MethodHandle hello = MethodHandles.tryFinally(TryFinally.MH_greet, TryFinally.MH_exclaim);

        assertEquals(TryFinally.MT_hello, hello.type());

        assertEquals("Hello, world!", hello.invoke("world"));

    }

    @Test

    public static void testTryFinallyVoid() throws Throwable {

        MethodHandle tfVoid = MethodHandles.tryFinally(TryFinally.MH_print, TryFinally.MH_printMore);

        assertEquals(TryFinally.MT_printHello, tfVoid.type());

        tfVoid.invoke("world");

    }

    @Test

    public static void testTryFinallySublist() throws Throwable {

        MethodHandle helloMore = MethodHandles.tryFinally(TryFinally.MH_greetMore, TryFinally.MH_exclaimMore);

        assertEquals(TryFinally.MT_moreHello, helloMore.type());

        assertEquals("Hello, world and universe (but world first)!", helloMore.invoke("world", "universe"));

    }

    @DataProvider

    static Object[][] omitTrailingArguments() {

        MethodHandle c = TryFinally.MH_voidCleanup;

        return new Object[][]{

                {c},

                {MethodHandles.dropArguments(c, 1, int.class)},

                {MethodHandles.dropArguments(c, 1, int.class, long.class)},

                {MethodHandles.dropArguments(c, 1, int.class, long.class, Object.class, int.class)},

                {MethodHandles.dropArguments(c, 1, int.class, long.class, Object.class, int.class, long.class)}

        };

    }

    @Test(dataProvider = "omitTrailingArguments")

    public static void testTryFinallyOmitTrailingArguments(MethodHandle cleanup) throws Throwable {

        MethodHandle tf = MethodHandles.tryFinally(TryFinally.MH_dummyTarget, cleanup);

        tf.invoke(1, 2L, "a", 23, 42L, "b");

    }

    @DataProvider

    static Object[][] negativeTestData() {

        MethodHandle intid = MethodHandles.identity(int.class);

        MethodHandle intco = MethodHandles.constant(int.class, 0);

        MethodHandle errTarget = MethodHandles.dropArguments(intco, 0, int.class, double.class, String.class, int.class);

        MethodHandle errCleanup = MethodHandles.dropArguments(MethodHandles.constant(int.class, 0), 0, Throwable.class,

                int.class, double.class, Object.class);

        MethodHandle voidTarget = TryFinally.MH_voidTarget;

        MethodHandle voidICleanup = MethodHandles.dropArguments(TryFinally.MH_voidCleanup, 1, int.class);

        return new Object[][]{

                {intid, MethodHandles.identity(double.class),

                        "target and return types must match: double != int"},

                {intid, MethodHandles.dropArguments(intid, 0, String.class),

                        "cleanup first argument and Throwable must match: (String,int)int != class java.lang.Throwable"},

                {intid, MethodHandles.dropArguments(intid, 0, Throwable.class, double.class),

                        "cleanup second argument and target return type must match: (Throwable,double,int)int != int"},

                {errTarget, errCleanup,

                        "cleanup parameters after (Throwable,result) and target parameter list prefix must match: " +

                                errCleanup.type() + " != " + errTarget.type()},

                {voidTarget, voidICleanup,

                        "cleanup parameters after (Throwable,result) and target parameter list prefix must match: " +

                                voidICleanup.type() + " != " + voidTarget.type()}

        };

    }

    @Test(dataProvider = "negativeTestData")

    public static void testTryFinallyNegative(MethodHandle target, MethodHandle cleanup, String expectedMessage) {

        boolean caught = false;

        try {

            MethodHandles.tryFinally(target, cleanup);

        } catch (IllegalArgumentException iae) {

            assertEquals(expectedMessage, iae.getMessage());

            caught = true;

        }

        assertTrue(caught);

    }

    @Test

    public static void testTryFinallyThrowableCheck() {

        MethodHandle mh = MethodHandles.tryFinally(TryFinally.MH_throwingTarget,

                                                   TryFinally.MH_catchingCleanup);

        try {

            mh.invoke();

            fail("ClassCastException expected");

        } catch (Throwable t) {

            assertTrue("Throwable not assignable to ClassCastException: " + t,

                       ClassCastException.class.isAssignableFrom(t.getClass()));

        }

    }

    static class TryFinally {

        static String greet(String whom) {

            return "Hello, " + whom;

        }

        static String exclaim(Throwable t, String r, String whom) {

            return r + "!";

        }

        static void print(String what) {

            System.out.print("Hello, " + what);

        }

        static void printMore(Throwable t, String what) {

            System.out.println("!");

        }

        static String greetMore(String first, String second) {

            return "Hello, " + first + " and " + second;

        }

        static String exclaimMore(Throwable t, String r, String first) {

            return r + " (but " + first + " first)!";

        }

        static void voidTarget() {}

        static void voidCleanup(Throwable t) {}

        static class T1 extends Throwable {}

        static class T2 extends Throwable {}

        static void throwingTarget() throws Throwable {

            throw new T1();

        }

        static void catchingCleanup(T2 t) throws Throwable {

        }

        static final Class<TryFinally> TRY_FINALLY = TryFinally.class;

        static final MethodType MT_greet = methodType(String.class, String.class);

        static final MethodType MT_exclaim = methodType(String.class, Throwable.class, String.class, String.class);

        static final MethodType MT_print = methodType(void.class, String.class);

        static final MethodType MT_printMore = methodType(void.class, Throwable.class, String.class);

        static final MethodType MT_greetMore = methodType(String.class, String.class, String.class);

        static final MethodType MT_exclaimMore = methodType(String.class, Throwable.class, String.class, String.class);

        static final MethodType MT_voidTarget = methodType(void.class);

        static final MethodType MT_voidCleanup = methodType(void.class, Throwable.class);

        static final MethodType MT_throwingTarget = methodType(void.class);

        static final MethodType MT_catchingCleanup = methodType(void.class, T2.class);

        static final MethodHandle MH_greet;

        static final MethodHandle MH_exclaim;

        static final MethodHandle MH_print;

        static final MethodHandle MH_printMore;

        static final MethodHandle MH_greetMore;

        static final MethodHandle MH_exclaimMore;

        static final MethodHandle MH_voidTarget;

        static final MethodHandle MH_voidCleanup;

        static final MethodHandle MH_throwingTarget;

        static final MethodHandle MH_catchingCleanup;

        static final MethodHandle MH_dummyTarget;

        static final MethodType MT_hello = methodType(String.class, String.class);

        static final MethodType MT_printHello = methodType(void.class, String.class);

        static final MethodType MT_moreHello = methodType(String.class, String.class, String.class);

        static {

            try {

                MH_greet = LOOKUP.findStatic(TRY_FINALLY, "greet", MT_greet);

                MH_exclaim = LOOKUP.findStatic(TRY_FINALLY, "exclaim", MT_exclaim);

                MH_print = LOOKUP.findStatic(TRY_FINALLY, "print", MT_print);

                MH_printMore = LOOKUP.findStatic(TRY_FINALLY, "printMore", MT_printMore);

                MH_greetMore = LOOKUP.findStatic(TRY_FINALLY, "greetMore", MT_greetMore);

                MH_exclaimMore = LOOKUP.findStatic(TRY_FINALLY, "exclaimMore", MT_exclaimMore);

                MH_voidTarget = LOOKUP.findStatic(TRY_FINALLY, "voidTarget", MT_voidTarget);

                MH_voidCleanup = LOOKUP.findStatic(TRY_FINALLY, "voidCleanup", MT_voidCleanup);

                MH_throwingTarget = LOOKUP.findStatic(TRY_FINALLY, "throwingTarget", MT_throwingTarget);

                MH_catchingCleanup = LOOKUP.findStatic(TRY_FINALLY, "catchingCleanup", MT_catchingCleanup);

                MH_dummyTarget = MethodHandles.dropArguments(MH_voidTarget, 0, int.class, long.class, Object.class,

                        int.class, long.class, Object.class);

            } catch (Exception e) {

                throw new ExceptionInInitializerError(e);

            }

        }

    }

}