1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/test/tools/javac/lambda/methodReference/BridgeMethod.java Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,118 @@
1.4 +/*
1.5 + * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + */
1.26 +
1.27 +/**
1.28 + * @test
1.29 + * @bug 8003280
1.30 + * @summary Add lambda tests
1.31 + * Test bridge methods in certain SAM conversion
1.32 + * @compile BridgeMethod.java
1.33 + * @run main BridgeMethod
1.34 + */
1.35 +
1.36 +import java.lang.reflect.Method;
1.37 +import java.util.HashSet;
1.38 +import java.util.Set;
1.39 +
1.40 +public class BridgeMethod {
1.41 +
1.42 + interface H {Object m();}
1.43 +
1.44 + interface K<T> {void m(T t);}
1.45 +
1.46 + interface L extends K<String> {} //generic substitution
1.47 +
1.48 + interface M {void m(String s);}
1.49 +
1.50 + interface KM extends K<String>, M{} //generic substitution
1.51 +
1.52 + interface N extends H {String m();} //covariant return
1.53 +
1.54 + private static void assertTrue(boolean cond) {
1.55 + if (!cond)
1.56 + throw new AssertionError();
1.57 + }
1.58 +
1.59 + static void bar(String s) {
1.60 + System.out.println("BridgeMethod.bar(String) " + s);
1.61 + }
1.62 +
1.63 + String moo() {
1.64 + return "moo";
1.65 + }
1.66 +
1.67 + private static Set<String> setOfStringObject() {
1.68 + Set<String> s = new HashSet<>();
1.69 + s.add("java.lang.String");
1.70 + s.add("java.lang.Object");
1.71 + return s;
1.72 + }
1.73 +
1.74 + public static void main(String[] args) {
1.75 + L la = BridgeMethod::bar; //static reference
1.76 + la.m("hi");
1.77 + Class<? extends L> c1 = la.getClass();
1.78 + Method[] methods = c1.getDeclaredMethods();
1.79 + Set<String> types = setOfStringObject();
1.80 + System.out.println("methods in SAM conversion of L:");
1.81 + for(Method m : methods) {
1.82 + System.out.println(m.toGenericString());
1.83 + assertTrue(m.getName().equals("m"));
1.84 + Class[] parameterTypes = m.getParameterTypes();
1.85 + assertTrue(parameterTypes.length == 1);
1.86 + assertTrue(types.remove(parameterTypes[0].getName()));
1.87 + }
1.88 + assertTrue(types.isEmpty() || (types.size() == 1 && types.contains("java.lang.String")));
1.89 +
1.90 + KM km = BridgeMethod::bar;
1.91 + //km.m("hi"); //will be uncommented when CR7028808 fixed
1.92 + Class<? extends KM> c2 = km.getClass();
1.93 + methods = c2.getDeclaredMethods();
1.94 + types = setOfStringObject();
1.95 + System.out.println("methods in SAM conversion of KM:");
1.96 + for(Method m : methods) {
1.97 + System.out.println(m.toGenericString());
1.98 + assertTrue(m.getName().equals("m"));
1.99 + Class<?>[] parameterTypes = m.getParameterTypes();
1.100 + assertTrue(parameterTypes.length == 1);
1.101 + assertTrue(types.remove(parameterTypes[0].getName()));
1.102 + }
1.103 + assertTrue(types.isEmpty());
1.104 +
1.105 + N n = new BridgeMethod()::moo; //instance reference
1.106 + assertTrue( n.m().equals("moo") );
1.107 + assertTrue( ((H)n).m().equals("moo") );
1.108 + Class<? extends N> c3 = n.getClass();
1.109 + methods = c3.getDeclaredMethods();
1.110 + types = setOfStringObject();
1.111 + System.out.println("methods in SAM conversion of N:");
1.112 + for(Method m : methods) {
1.113 + System.out.println(m.toGenericString());
1.114 + if (m.getName().equals("m")) {
1.115 + Class<?> returnType = m.getReturnType();
1.116 + assertTrue(types.remove(returnType.getName()));
1.117 + }
1.118 + }
1.119 + assertTrue(types.size() == 1); //there's a bridge
1.120 + }
1.121 +}
