1 /*
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  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
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  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
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 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
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 22  */
 23 
 24 /*
 25  * @test
 26  * @bug 6298888 6992705 8161500 6304578
 27  * @summary Check Class.toGenericString()
 28  * @author Joseph D. Darcy
 29  * @enablePreview
 30  * @compile GenericStringTest.java
 31  * @run main/othervm GenericStringTest
 32  */
 33 
 34 import java.lang.reflect.*;
 35 import java.lang.annotation.*;
 36 import java.util.*;
 37 
 38 @ExpectedGenericString("public class GenericStringTest")
 39 public class GenericStringTest {
 40     public Map<String, Integer>[] mixed = null;
 41     public Map<String, Integer>[][] mixed2 = null;
 42 
 43     public static void main(String... args) throws ReflectiveOperationException {
 44         int failures = 0;
 45 
 46         String[][] nested = {{""}};
 47         int[][]    intArray = {{1}};
 48 
 49         Map<Class<?>, String> testCases =
 50             Map.of(int.class,                          "int",
 51                    void.class,                         "void",
 52                    args.getClass(),                    "java.lang.String[]",
 53                    nested.getClass(),                  "java.lang.String[][]",
 54                    intArray.getClass(),                "int[][]",
 55                    java.lang.Enum.class,               "public abstract class java.lang.Enum<E extends java.lang.Enum<E>>",
 56                    java.util.Map.class,                "public abstract interface java.util.Map<K,V>",
 57                    java.util.EnumMap.class,            "public class java.util.EnumMap<K extends java.lang.Enum<K>,V>",
 58                    java.util.EventListenerProxy.class, "public abstract class java.util.EventListenerProxy<T extends java.util.EventListener>");
 59 
 60         for (Map.Entry<Class<?>, String> testCase : testCases.entrySet()) {
 61             failures += checkToGenericString(testCase.getKey(), testCase.getValue());
 62         }
 63 
 64         Field f = GenericStringTest.class.getDeclaredField("mixed");
 65         // The expected value includes "<K,V>" rather than
 66         // "<...String,...Integer>" since the Class object rather than
 67         // Type objects is being queried.
 68         failures += checkToGenericString(f.getType(), "java.util.Map<K,V>[]");
 69         f = GenericStringTest.class.getDeclaredField("mixed2");
 70         failures += checkToGenericString(f.getType(), "java.util.Map<K,V>[][]");
 71 
 72         for(Class<?> clazz : List.of(GenericStringTest.class,
 73                                      AnInterface.class,
 74                                      LocalMap.class,
 75                                      AnEnum.class,
 76                                      AnotherEnum.class,
 77                                      AValueClass.class)) {
 78             failures += checkToGenericString(clazz, clazz.getAnnotation(ExpectedGenericString.class).value());
 79         }
 80 
 81         if (failures > 0) {
 82             throw new RuntimeException();
 83         }
 84     }
 85 
 86     private static int checkToGenericString(Class<?> clazz, String expected) {
 87         String genericString = clazz.toGenericString();
 88         if (!genericString.equals(expected)) {
 89             System.err.printf("Unexpected Class.toGenericString output; expected %n\t'%s',%n got %n\t'%s'.%n",
 90                               expected,
 91                               genericString);
 92             return 1;
 93         } else
 94             return 0;
 95     }
 96 }
 97 
 98 @Retention(RetentionPolicy.RUNTIME)
 99 @interface ExpectedGenericString {
100     String value();
101 }
102 
103 @ExpectedGenericString("abstract interface AnInterface")
104 strictfp interface AnInterface {}
105 
106 @ExpectedGenericString("abstract interface LocalMap<K,V>")
107 interface LocalMap<K,V> {}
108 
109 @ExpectedGenericString("final enum AnEnum")
110 enum AnEnum {
111     FOO;
112 }
113 
114 @ExpectedGenericString("enum AnotherEnum")
115 enum AnotherEnum {
116     BAR{};
117 }
118 
119 @ExpectedGenericString("final value class AValueClass<E>")
120 value class AValueClass<E> {}