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 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.

 * 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

 * @bug 8003280

 * @summary Add lambda tests

 *   Test bridge methods for certain SAM conversions

 * @compile LambdaTest6.java

 * @run main LambdaTest6

 */

import java.lang.reflect.Method;

import java.util.HashSet;

import java.util.Set;

public class LambdaTest6<T> {

    interface H {Object m();}

    interface K<U> {void m(U element);}

    interface L extends K<String> {} //generic substitution

    interface M {void m(String s);}

    interface KM extends K<String>, M{} //generic substitution

    interface N extends H {String m();} //covariant return

    private static void assertTrue(boolean b) {

        if(!b)

            throw new AssertionError();

    }

    private Set<String> setOfStringObject() {

        Set<String> s = new HashSet<>();

        s.add("java.lang.String");

        s.add("java.lang.Object");

        return s;

    }

    private void test1()

    {

        L la = s -> { };

        la.m("hi");

        Class<? extends L> c1 = la.getClass();

        Method[] methods = c1.getDeclaredMethods();

        Set<String> types = setOfStringObject();

        for(Method m : methods) {

            assertTrue(m.getName().equals("m"));

            Class[] parameterTypes = m.getParameterTypes();

            assertTrue(parameterTypes.length == 1);

            assertTrue(types.remove(parameterTypes[0].getName()));

        }

        assertTrue(types.isEmpty() || (types.size() == 1 && types.contains("java.lang.String")));

    }

    private void test2()

    {

        KM km = s -> { };

        //km.m("hi");

        Class<? extends KM> c2 = km.getClass();

        Method[] methods = c2.getDeclaredMethods();

        Set<String> types = setOfStringObject();

        for(Method m : methods) {

            assertTrue(m.getName().equals("m"));

            Class[] parameterTypes = m.getParameterTypes();

            assertTrue(parameterTypes.length == 1);

            assertTrue(types.remove(parameterTypes[0].getName()));

        }

        assertTrue(types.isEmpty());

    }

    private void test3()

    {

        N na = ()-> "hi";

        assertTrue( na.m().equals("hi") );

        assertTrue( ((H)na).m().equals("hi") );

        Class<? extends N> c3 = na.getClass();

        Method[] methods = c3.getDeclaredMethods();

        Set<String> types = setOfStringObject();

        for(Method m : methods) {

            assertTrue(m.getName().equals("m"));

            Class returnType = m.getReturnType();

            assertTrue(types.remove(returnType.getName()));

        }

    }

    public static void main(String[] args) {

        LambdaTest6 test = new LambdaTest6();

        test.test1();

        test.test2();

        test.test3();

    }

}