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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 public class Main {
     18   public static void main(String[] args) {
     19     System.loadLibrary(args[0]);
     20     testRegistration1();
     21     testRegistration2();
     22     testRegistration3();
     23   }
     24 
     25   // Test that a subclass' method is registered instead of a superclass' method.
     26   private static void testRegistration1() {
     27     registerNatives(TestSub.class);
     28 
     29     expectNotThrows(new TestSub());
     30     expectThrows(new TestSuper());
     31   }
     32 
     33   // Test that a superclass' method is registered if the subclass doesn't have a matching method.
     34   private static void testRegistration2() {
     35     registerNatives(TestSub2.class);
     36 
     37     expectNotThrows(new TestSub2());
     38     expectNotThrows(new TestSuper2());
     39   }
     40 
     41   // Test that registration fails if the subclass has a matching non-native method.
     42   private static void testRegistration3() {
     43     try {
     44       registerNatives(TestSub3.class);
     45       System.out.println("Expected exception for registerNatives(TestSub3.class)");
     46     } catch (NoSuchMethodError ignored) {
     47     }
     48   }
     49 
     50   private native static int registerNatives(Class c);
     51 
     52   private static void expectThrows(Base b) {
     53     try {
     54       b.callMyFoo();
     55       System.out.println("Expected exception for " + b.getClass().getName());
     56     } catch (Throwable ignored) {
     57     }
     58   }
     59 
     60   private static void expectNotThrows(Base b) {
     61     try {
     62       b.callMyFoo();
     63     } catch (Throwable t) {
     64       System.out.println("Did not expect an exception for " + b.getClass().getName());
     65       t.printStackTrace(System.out);
     66     }
     67   }
     68 }
     69 
     70 abstract class Base {
     71   public abstract void callMyFoo();
     72 }
     73 
     74 class TestSuper extends Base {
     75   private native void foo();
     76 
     77   @Override
     78   public void callMyFoo() {
     79     foo();
     80   }
     81 }
     82 
     83 class TestSub extends TestSuper {
     84   public native void foo();
     85 
     86   @Override
     87   public void callMyFoo() {
     88     foo();
     89   }
     90 }
     91 
     92 class TestSuper2 extends Base{
     93   public native void foo();
     94 
     95   @Override
     96   public void callMyFoo() {
     97     foo();
     98   }
     99 }
    100 
    101 class TestSub2 extends TestSuper2 {
    102 }
    103 
    104 class TestSuper3 extends Base {
    105   public native void foo();
    106 
    107   @Override
    108   public void callMyFoo() {
    109     foo();
    110   }
    111 }
    112 
    113 class TestSub3 extends TestSuper3 {
    114   public void foo() {
    115     System.out.println("TestSub3.foo()");
    116   }
    117 }
    118