content: /*
   * Copyright (C) 2017 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.Constructor;
  import java.lang.reflect.Method;
  
  public class Main {
      public static String TEST_NAME = "155-java-set-resolved-type";
  
      public static void main(String[] args) {
          try {
              Class<?> class_loader_class = Class.forName("dalvik.system.PathClassLoader");
              System.loadLibrary(args[0]);
          } catch (ClassNotFoundException e) {
              usingRI = true;
              // Add expected JNI_OnLoad log line to match expected.txt.
              System.out.println("JNI_OnLoad called");
          }
          try {
              String dex_location = System.getenv("DEX_LOCATION");
              ClassLoader systemLoader = ClassLoader.getSystemClassLoader().getParent();
              ClassLoader exLoader = getClassLoaderFor(dex_location, systemLoader, /* ex */ true);
              ClassLoader mainLoader = getClassLoaderFor(dex_location, exLoader, /* ex */ false);
  
              // Resolve TestParameter class. It shall be defined by mainLoader.
              // This does not resolve method parameter types.
              Class<?> tpc = Class.forName("TestParameter", false, mainLoader);
              // Get declared methods of TestParameter.
              // This still does not resolve method parameter types.
              Method[] ms = tpc.getDeclaredMethods();
              if (ms == null || ms.length != 1) { throw new Error("Unexpected methods"); };
              // Call getParameterTypes() to resolve parameter types. The parameter type
              // TestInterface shall be defined by the exLoader. This used to store the
              // TestInterface class in the dex cache resolved types for the mainLoader
              // but not in the mainLoader's class table. This discrepancy used to cause
              // a crash further down.
              ms[0].getParameterTypes();
  
              // Resolve but do not initialize TestImplementation. During the resolution,
              // we see the TestInterface in the dex cache, so we do not try to look it up
              // or resolve it using the mainLoader.
              Class<?> timpl = Class.forName("TestImplementation", false, mainLoader);
              // Clear the dex cache resolved types to force a proper lookup the next time
              // we need to find TestInterface.
              clearResolvedTypes(timpl);
  
              // Force intialization of TestImplementation. This expects the interface type
              // to be resolved and found through simple lookup.
              timpl.newInstance();
          } catch (Throwable t) {
              t.printStackTrace();
          }
      }
  
      public static ClassLoader getClassLoaderFor(String location, ClassLoader parent, boolean ex)
              throws Exception {
          try {
              Class<?> class_loader_class = Class.forName("dalvik.system.PathClassLoader");
              Constructor<?> ctor =
                      class_loader_class.getConstructor(String.class, ClassLoader.class);
              /* on Dalvik, this is a DexFile; otherwise, it's null */
              String path = location + "/" + TEST_NAME + (ex ? "-ex.jar" : ".jar");
              return (ClassLoader)ctor.newInstance(path, parent);
          } catch (ClassNotFoundException e) {
              // Running on RI. Use URLClassLoader.
              String url = "file://" + location + (ex ? "/classes-ex/" : "/classes/");
              return new java.net.URLClassLoader(
                      new java.net.URL[] { new java.net.URL(url) }, parent);
          }
      }
  
      public static void clearResolvedTypes(Class<?> c) {
          if (!usingRI) {
              nativeClearResolvedTypes(c);
          }
      }
  
      private static boolean usingRI = false;
  
      public static native void nativeClearResolvedTypes(Class<?> c);
  }
  