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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

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 *

 * 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

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 *

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 * 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

 *  basic test for lambda conversion

 * @author  Brian Goetz

 * @author  Maurizio Cimadamore

 * @run main LambdaConv01

 */

public class LambdaConv01 {

    static int assertionCount = 0;

    static void assertTrue(boolean cond) {

        assertionCount++;

        if (!cond)

            throw new AssertionError();

    }

    interface IntToInt {

      public int foo(int x);

    }

    interface IntToVoid {

      public void foo(int x);

    }

    interface VoidToInt {

      public int foo();

    }

    interface TU<T, U> {

      public T foo(U u);

    }

    public static <T, U> T exec(TU<T, U> lambda, U x) {

        return lambda.foo(x);

    }

    static {

        //Assignment conversion:

        VoidToInt f1 = ()-> 3;

        assertTrue(3 == f1.foo());

        //Covariant returns:

        TU<Number, Integer> f2 = (Integer x) -> x;

        assertTrue(3 == f2.foo(3));

        //Method resolution with boxing:

        int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);

        assertTrue(3 == res);

        //Runtime exception transparency:

        try {

            LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);

        }

        catch (RuntimeException e) {

            assertTrue(true);

        }

    }

    {

        //Assignment conversion:

        VoidToInt f1 = ()-> 3;

        assertTrue(3 == f1.foo());

        //Covariant returns:

        TU<Number, Integer> f2 = (Integer x) -> x;

        assertTrue(3 == f2.foo(3));

        //Method resolution with boxing:

        int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);

        assertTrue(3 == res);

        //Runtime exception transparency:

        try {

            LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);

        }

        catch (RuntimeException e) {

            assertTrue(true);

        }

    }

    public static void test1() {

        //Assignment conversion:

        VoidToInt f1 = ()-> 3;

        assertTrue(3 == f1.foo());

        //Covariant returns:

        TU<Number, Integer> f2 = (Integer x) -> x;

        assertTrue(3 == f2.foo(3));

        //Method resolution with boxing:

        int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);

        assertTrue(3 == res);

        //Runtime exception transparency:

        try {

            LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);

        }

        catch (RuntimeException e) {

            assertTrue(true);

        }

    }

    public void test2() {

        //Assignment conversion:

        VoidToInt f1 = ()-> 3;

        assertTrue(3 == f1.foo());

        //Covariant returns:

        TU<Number, Integer> f2 = (Integer x) -> x;

        assertTrue(3 == f2.foo(3));

        //Method resolution with boxing:

        int res = LambdaConv01.<Integer,Integer>exec((Integer x) -> x, 3);

        assertTrue(3 == res);

        //Runtime exception transparency:

        try {

            LambdaConv01.<Integer,Object>exec((Object x) -> x.hashCode(), null);

        }

        catch (RuntimeException e) {

            assertTrue(true);

        }

    }

    public static void main(String[] args) {

        test1();

        new LambdaConv01().test2();

        assertTrue(assertionCount == 16);

    }

}