1 /*
   2  * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   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
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  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
  21  * questions.
  22  */
  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  * @compile -g OverridesSpecEx.java
  30  * @compile -processor OverridesSpecEx -proc:only OverridesSpecEx.java
  31  */
  32 
  33 import java.util.Set;
  34 import javax.annotation.processing.*;
  35 import javax.lang.model.SourceVersion;
  36 import javax.lang.model.element.*;
  37 import javax.lang.model.type.*;
  38 import javax.lang.model.util.*;
  39 
  40 import static javax.lang.model.util.ElementFilter.*;
  41 
  42 
  43 @SupportedAnnotationTypes("*")
  44 public class OverridesSpecEx extends AbstractProcessor {
  45 
  46     Elements elements;
  47     Types types;
  48 
  49     public void init(ProcessingEnvironment penv) {
  50         super.init(penv);
  51         elements = penv.getElementUtils();
  52         types =  penv.getTypeUtils();
  53     }
  54 
  55     public boolean process(Set<? extends TypeElement> annoTypes,
  56                            RoundEnvironment round) {
  57         if (!round.processingOver())
  58             doit(annoTypes, round);
  59         return true;
  60     }
  61 
  62     @Override
  63     public SourceVersion getSupportedSourceVersion() {
  64         return SourceVersion.latest();
  65     }
  66 
  67     private void doit(Set<? extends TypeElement> annoTypes,
  68                       RoundEnvironment round) {
  69         TypeElement string = elements.getTypeElement("java.lang.String");
  70         TypeElement object = elements.getTypeElement("java.lang.Object");
  71 
  72         ExecutableElement m1 = null;
  73         ExecutableElement m2 = null;
  74         for (ExecutableElement m : methodsIn(string.getEnclosedElements())) {
  75             if (m.getSimpleName().contentEquals("hashCode")) {
  76                 m1 = m;
  77                 break;
  78             }
  79         }
  80         for (ExecutableElement m : methodsIn(object.getEnclosedElements())) {
  81             if (m.getSimpleName().contentEquals("hashCode")) {
  82                 m2 = m;
  83                 break;
  84             }
  85         }
  86 
  87         boolean res =
  88             elements.overrides(m1, m2, (TypeElement) m1.getEnclosingElement());
  89         System.out.println("String.hashCode overrides Object.hashCode?  " + res);
  90         checkResult(res);
  91 
  92         TypeElement a = elements.getTypeElement("OverridesSpecEx.A");
  93         TypeElement b = elements.getTypeElement("OverridesSpecEx.B");
  94         TypeElement c = elements.getTypeElement("OverridesSpecEx.C");
  95 
  96         m1 = null;
  97         m2 = null;
  98         for (ExecutableElement m : methodsIn(a.getEnclosedElements()))
  99             m1 = m;
 100         for (ExecutableElement m : methodsIn(b.getEnclosedElements()))
 101             m2 = m;
 102 
 103         res = elements.overrides(m1, m2, a);
 104         System.out.println("A.m overrides B.m in B?  " + res);
 105         checkResult(!res);
 106         res = elements.overrides(m1, m2, c);
 107         System.out.println("A.m overrides B.m in C?  " + res);
 108         checkResult(res);
 109     }
 110 
 111     private static void checkResult(boolean truthiness) {
 112         if (!truthiness)
 113             throw new AssertionError("Bogus result");
 114     }
 115 
 116 
 117     // Fodder for the processor
 118 
 119     class A {
 120         public void m() {}
 121     }
 122     interface B {
 123         void m();
 124     }
 125     class C extends A implements B {
 126     }
 127 }