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23 
24 /*
25  * @test
26  * @bug 6298888 6992705 8161500
27  * @summary Check Class.toGenericString()
28  * @author Joseph D. Darcy
29  */
30 
31 import java.lang.reflect.*;
32 import java.lang.annotation.*;
33 import java.util.*;
34 
35 @ExpectedGenericString("public class GenericStringTest")
36 public class GenericStringTest {
37     public Map<String, Integer>[] mixed = null;
38     public Map<String, Integer>[][] mixed2 = null;
39 
main(String... args)40     public static void main(String... args) throws ReflectiveOperationException {
41         int failures = 0;
42 
43         String[][] nested = {{""}};
44         int[][]    intArray = {{1}};
45 
46         failures += checkToGenericString(int.class, "int");
47         failures += checkToGenericString(void.class, "void");
48         failures += checkToGenericString(args.getClass(), "java.lang.String[]");
49         failures += checkToGenericString(nested.getClass(), "java.lang.String[][]");
50         failures += checkToGenericString(intArray.getClass(), "int[][]");
51         failures += checkToGenericString(java.util.Map.class, "public abstract interface java.util.Map<K,V>");
52 
53         Field f = GenericStringTest.class.getDeclaredField("mixed");
54         // The expected value includes "<K,V>" rather than
55         // "<...String,...Integer>" since the Class object rather than
56         // Type objects is being queried.
57         failures += checkToGenericString(f.getType(), "java.util.Map<K,V>[]");
58         f = GenericStringTest.class.getDeclaredField("mixed2");
59         failures += checkToGenericString(f.getType(), "java.util.Map<K,V>[][]");
60 
61         for(Class<?> clazz : List.of(GenericStringTest.class,
62                                      AnInterface.class,
63                                      LocalMap.class,
64                                      AnEnum.class,
65                                      AnotherEnum.class)) {
66             failures += checkToGenericString(clazz, clazz.getAnnotation(ExpectedGenericString.class).value());
67         }
68 
69         if (failures > 0) {
70             throw new RuntimeException();
71         }
72     }
73 
checkToGenericString(Class<?> clazz, String expected)74     private static int checkToGenericString(Class<?> clazz, String expected) {
75         String genericString = clazz.toGenericString();
76         if (!genericString.equals(expected)) {
77             System.err.printf("Unexpected Class.toGenericString output; expected '%s', got '%s'.%n",
78                               expected,
79                               genericString);
80             return 1;
81         } else
82             return 0;
83     }
84 }
85 
86 @Retention(RetentionPolicy.RUNTIME)
87 @interface ExpectedGenericString {
value()88     String value();
89 }
90 
91 @ExpectedGenericString("abstract interface AnInterface")
92 strictfp interface AnInterface {}
93 
94 @ExpectedGenericString("abstract interface LocalMap<K,V>")
95 interface LocalMap<K,V> {}
96 
97 @ExpectedGenericString("final enum AnEnum")
98 enum AnEnum {
99     FOO;
100 }
101 
102 @ExpectedGenericString("enum AnotherEnum")
103 enum AnotherEnum {
104     BAR{};
105 }
106