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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * 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 unit tests for arity limits of methods in java.lang.invoke.MethodHandles

 * @run junit/othervm test.java.lang.invoke.MethodHandlesArityLimitsTest

 **/

package test.java.lang.invoke;

import org.junit.*;

import java.lang.invoke.MethodHandles;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.WrongMethodTypeException;

import java.lang.invoke.MethodType;

import java.lang.invoke.VarHandle;

import java.util.List;

import java.util.stream.IntStream;

import static org.junit.Assert.*;

public class MethodHandlesArityLimitsTest {

    private static MethodType mt254 = null;

    private static MethodType mt255 = null;

    static {

        Class<?>[] classes254 = IntStream.range(0, 254)

                                         .mapToObj(i -> int.class)

                                         .toArray(Class[]::new);

        mt254 = MethodType.methodType(void.class, classes254);

        mt255 = mt254.appendParameterTypes(int.class);

    }

    @Test(expected = IllegalArgumentException.class)

    public void testDropArgumentsToMatch() {

        MethodHandles.dropArgumentsToMatch(MethodHandles.empty(mt254), 0, mt255.parameterList(), 0);

    }

    @Test(expected = IllegalArgumentException.class)

    public void testEmpty() {

        MethodHandles.empty(mt255);

    }

    @Test(expected = IllegalArgumentException.class)

    public void testExplicitCastArguments() {

        MethodHandles.explicitCastArguments(

                                         MethodHandles.empty(mt254),

                                         mt254.dropParameterTypes(0, 1).insertParameterTypes(0, long.class) );

    }

    @Test(expected = IllegalArgumentException.class)

    public void testPermuteArguments() {

        MethodHandles.permuteArguments(

                                    MethodHandles.empty(MethodType.methodType(void.class)),

                                    mt255);

    }

    @Test(expected = IllegalArgumentException.class)

    public void testVarHandleInvoker() {

        MethodHandles.varHandleInvoker(VarHandle.AccessMode.GET, mt254);

    }

    @Test(expected = IllegalArgumentException.class)

    public void testVarHandleExactInvoker() {

        MethodHandles.varHandleExactInvoker(VarHandle.AccessMode.GET, mt254);

    }

    @Test(expected = IllegalArgumentException.class)

    public void testMHExactInvoker() {

        MethodHandles.exactInvoker(mt255);

    }

    @Test(expected = IllegalArgumentException.class)

    public void testMHInvoker() {

        MethodHandles.invoker(mt255);

    }

    @Test(expected = IllegalArgumentException.class)

    public void testMHSpreadInvoker() {

        MethodHandles.spreadInvoker(mt255, 255);

    }

    @Test(expected = WrongMethodTypeException.class)

    public void testAsType() throws ReflectiveOperationException {

        MethodHandle asList = MethodHandles.lookup().findStatic(

                                                java.util.Arrays.class,

                                                "asList",

                                                MethodType.methodType(List.class, Object[].class));

        try {

           asList.asType(MethodType.genericMethodType(254));//does not throw IAE or WMTE

        }

        catch(WrongMethodTypeException wmte) {

           Assert.fail("Unexpected WrongMethodTypeException thrown");

        }

        asList.asType(MethodType.genericMethodType(255));//throws WMTE

    }

}