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23
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 */
32
33import java.lang.reflect.Method;
34import java.util.HashSet;
35import java.util.Set;
36
37public class BridgeMethod {
38
39    interface H {Object m();}
40
41    interface K<T> {void m(T t);}
42
43    interface L extends K<String> {} //generic substitution
44
45    interface M {void m(String s);}
46
47    interface KM extends K<String>, M{} //generic substitution
48
49    interface N extends H {String m();} //covariant return
50
51    private static void assertTrue(boolean cond) {
52        if (!cond)
53            throw new AssertionError();
54    }
55
56    static void bar(String s) {
57        System.out.println("BridgeMethod.bar(String) " + s);
58    }
59
60    String moo() {
61        return "moo";
62    }
63
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    }
70
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")));
86
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());
101
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            if (m.getName().equals("m")) {
112                Class<?> returnType = m.getReturnType();
113                assertTrue(types.remove(returnType.getName()));
114            }
115        }
116        assertTrue(types.size() == 1); //there's a bridge
117    }
118}
119