Fri, 30 Nov 2012 15:14:25 +0000
8004102: Add support for generic functional descriptors
Summary: Method references are allowed to have a generic functional interface descriptor target
Reviewed-by: jjg
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.isEmpty());
116 }
117 }