jdk8-mips64-public/langtools: test/tools/javac/lambda/methodReference/BridgeMethod.java@39ec5d8a691b

8016281: The SAM method should be passed to the metafactory as a MethodType not a MethodHandle
8020010: Move lambda bridge creation from metafactory and VM to compiler
Summary: langtools/javac component of the bridge support and MethodType vs. MethodHandle changes.
Reviewed-by: jjg, vromero, briangoetz, forax
Contributed-by: robert.field@oracle.com

     1 /*

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

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

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

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

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    24 /**

    25  * @test

    26  * @bug 8003280

    27  * @summary Add lambda tests

    28  *   Test bridge methods in certain SAM conversion

    29  * @compile BridgeMethod.java

    30  * @run main BridgeMethod

    31  */

    33 import java.lang.reflect.Method;

    34 import java.util.HashSet;

    35 import java.util.Set;

    37 public class BridgeMethod {

    39     interface H {Object m();}

    41     interface K<T> {void m(T t);}

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

    45     interface M {void m(String s);}

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

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

    51     private static void assertTrue(boolean cond) {

    52         if (!cond)

    53             throw new AssertionError();

    54     }

    56     static void bar(String s) {

    57         System.out.println("BridgeMethod.bar(String) " + s);

    58     }

    60     String moo() {

    61         return "moo";

    62     }

    64     private static Set<String> setOfStringObject() {

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

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

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

    68         return s;

    69     }

    71     public static void main(String[] args) {

    72         L la = BridgeMethod::bar; //static reference

    73         la.m("hi");

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

    75         Method[] methods = c1.getDeclaredMethods();

    76         Set<String> types = setOfStringObject();

    77         System.out.println("methods in SAM conversion of L:");

    78         for(Method m : methods) {

    79             System.out.println(m.toGenericString());

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

    81             Class[] parameterTypes = m.getParameterTypes();

    82             assertTrue(parameterTypes.length == 1);

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

    84         }

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

    87         KM km = BridgeMethod::bar;

    88         //km.m("hi"); //will be uncommented when CR7028808 fixed

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

    90         methods = c2.getDeclaredMethods();

    91         types = setOfStringObject();

    92         System.out.println("methods in SAM conversion of KM:");

    93         for(Method m : methods) {

    94             System.out.println(m.toGenericString());

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

    96             Class<?>[] parameterTypes = m.getParameterTypes();

    97             assertTrue(parameterTypes.length == 1);

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

    99         }

   100         assertTrue(types.isEmpty());

   102         N n = new BridgeMethod()::moo; //instance reference

   103         assertTrue( n.m().equals("moo") );

   104         assertTrue( ((H)n).m().equals("moo") );

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

   106         methods = c3.getDeclaredMethods();

   107         types = setOfStringObject();

   108         System.out.println("methods in SAM conversion of N:");

   109         for(Method m : methods) {

   110             System.out.println(m.toGenericString());

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

   112             Class<?> returnType = m.getReturnType();

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

   114         }

   115         assertTrue(types.size() == 1); //there's a bridge

   116     }

   117 }

Mercurial > jdk8-mips64-public > langtools / file revision

test/tools/javac/lambda/methodReference/BridgeMethod.java@39ec5d8a691b

test/tools/javac/lambda/methodReference/BridgeMethod.java