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23 
24 /*
25  * @test
26  * @bug     6453386
27  * @summary Verify that example code in Elements.overrides works as spec'ed.
28  * @author  Scott Seligman
29  * @library /tools/javac/lib
30  * @modules java.compiler
31  *          jdk.compiler
32  * @build JavacTestingAbstractProcessor
33  * @compile -g OverridesSpecEx.java
34  * @compile -processor OverridesSpecEx -proc:only OverridesSpecEx.java
35  */
36 
37 import java.util.Set;
38 import javax.annotation.processing.*;
39 import javax.lang.model.SourceVersion;
40 import javax.lang.model.element.*;
41 import javax.lang.model.type.*;
42 import javax.lang.model.util.*;
43 
44 import static javax.lang.model.util.ElementFilter.*;
45 
46 public class OverridesSpecEx extends JavacTestingAbstractProcessor {
process(Set<? extends TypeElement> annoTypes, RoundEnvironment round)47     public boolean process(Set<? extends TypeElement> annoTypes,
48                            RoundEnvironment round) {
49         if (!round.processingOver())
50             doit(annoTypes, round);
51         return true;
52     }
53 
doit(Set<? extends TypeElement> annoTypes, RoundEnvironment round)54     private void doit(Set<? extends TypeElement> annoTypes,
55                       RoundEnvironment round) {
56         TypeElement string = elements.getTypeElement("java.lang.String");
57         TypeElement object = elements.getTypeElement("java.lang.Object");
58 
59         ExecutableElement m1 = null;
60         ExecutableElement m2 = null;
61         for (ExecutableElement m : methodsIn(string.getEnclosedElements())) {
62             if (m.getSimpleName().contentEquals("hashCode")) {
63                 m1 = m;
64                 break;
65             }
66         }
67         for (ExecutableElement m : methodsIn(object.getEnclosedElements())) {
68             if (m.getSimpleName().contentEquals("hashCode")) {
69                 m2 = m;
70                 break;
71             }
72         }
73 
74         boolean res =
75             elements.overrides(m1, m2, (TypeElement) m1.getEnclosingElement());
76         System.out.println("String.hashCode overrides Object.hashCode?  " + res);
77         checkResult(res);
78 
79         TypeElement a = elements.getTypeElement("OverridesSpecEx.A");
80         TypeElement b = elements.getTypeElement("OverridesSpecEx.B");
81         TypeElement c = elements.getTypeElement("OverridesSpecEx.C");
82 
83         m1 = null;
84         m2 = null;
85         for (ExecutableElement m : methodsIn(a.getEnclosedElements()))
86             m1 = m;
87         for (ExecutableElement m : methodsIn(b.getEnclosedElements()))
88             m2 = m;
89 
90         res = elements.overrides(m1, m2, a);
91         System.out.println("A.m overrides B.m in B?  " + res);
92         checkResult(!res);
93         res = elements.overrides(m1, m2, c);
94         System.out.println("A.m overrides B.m in C?  " + res);
95         checkResult(res);
96     }
97 
checkResult(boolean truthiness)98     private static void checkResult(boolean truthiness) {
99         if (!truthiness)
100             throw new AssertionError("Bogus result");
101     }
102 
103     // Fodder for the processor
104     class A {
m()105         public void m() {}
106     }
107     interface B {
m()108         void m();
109     }
110     class C extends A implements B {
111     }
112 }
113