test/910-methods/src/Main.java

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;

public class Main {
  public static void main(String[] args) throws Exception {
    System.loadLibrary(args[1]);

    doTest();
  }

  public static void doTest() throws Exception {
    testMethod("java.lang.Object", "toString");
    testMethod("java.lang.String", "charAt", int.class);
    testMethod("java.lang.Math", "sqrt", double.class);
    testMethod("java.util.List", "add", Object.class);

    testMethod(getProxyClass(), "run");
  }

  private static Class<?> proxyClass = null;

  private static Class<?> getProxyClass() throws Exception {
    if (proxyClass != null) {
      return proxyClass;
    }

    proxyClass = Proxy.getProxyClass(Main.class.getClassLoader(), new Class[] { Runnable.class });
    return proxyClass;
  }

  private static void testMethod(String className, String methodName, Class<?>... types)
      throws Exception {
    Class<?> base = Class.forName(className);
    testMethod(base, methodName, types);
  }

  private static void testMethod(Class<?> base, String methodName, Class<?>... types)
      throws Exception {
    Method m = base.getDeclaredMethod(methodName, types);
    String[] result = getMethodName(m);
    System.out.println(Arrays.toString(result));

    Class<?> declClass = getMethodDeclaringClass(m);
    if (base != declClass) {
      throw new RuntimeException("Declaring class not equal: " + base + " vs " + declClass);
    }
    System.out.println(declClass);
  }

  private static native String[] getMethodName(Method m);
  private static native Class<?> getMethodDeclaringClass(Method m);
}