content: /*
   * Copyright (C) 2010 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;
  import java.lang.reflect.InvocationTargetException;
  
  /**
   * Class loader test.
   */
  public class Main {
      /**
       * Thrown when an unexpected Exception is caught internally.
       */
      static class TestFailed extends Exception {
          public TestFailed(Throwable cause) {
              super(cause);
          }
      }
  
      /**
       * A class loader which loads classes from the dex file
       * "test.jar". However, it will return null when asked to load the
       * class InaccessibleSuper.
       *
       * When testing code calls BrokenDexLoader's findBrokenClass(),
       * a BrokenDexLoader will be the defining loader for the class
       * Inaccessible.  The VM will call the defining loader for
       * "InaccessibleSuper", which will return null, which the VM
       * should be able to deal with gracefully.
       *
       * Note that this depends heavily on the Dalvik test harness.
       */
      static class BrokenDexLoader extends ClassLoader {
  
          /** We return null when asked to load InaccessibleSuper. */
          private static class InaccessibleSuper {}
          private static class Inaccessible extends InaccessibleSuper {}
  
          private static final String SUPERCLASS_NAME =
                  "Main$BrokenDexLoader$InaccessibleSuper";
          private static final String CLASS_NAME =
                  "Main$BrokenDexLoader$Inaccessible";
  
          private static final String DEX_FILE = System.getenv("DEX_LOCATION") + "/086-null-super.jar";
  
          public BrokenDexLoader(ClassLoader parent) {
              super(parent);
          }
  
          /**
           * Finds the class with the specified binary name, from DEX_FILE.
           *
           * If we don't find a match, we throw an exception.
           */
          private Class<?> findDexClass(String name)
                  throws TestFailed, InvocationTargetException
          {
  
              try {
                  /*
                   * Find the DexFile class, and construct a DexFile object
                   * through reflection, then call loadCLass on it.
                   */
                  Class mDexClass = ClassLoader.getSystemClassLoader().
                          loadClass("dalvik.system.DexFile");
                  Constructor ctor = mDexClass.
                          getConstructor(new Class[] {String.class});
                  Object mDexFile = ctor.newInstance(DEX_FILE);
                  Method meth = mDexClass.
                          getMethod("loadClass",
                              new Class[] { String.class, ClassLoader.class });
                  /*
                   * Invoking loadClass on CLASS_NAME is expected to
                   * throw an InvocationTargetException. Anything else
                   * is an error we can't recover from.
                   */
                  meth.invoke(mDexFile, name, this);
              } catch (NoSuchMethodException nsme) {
                  throw new TestFailed(nsme);
              } catch (InstantiationException ie) {
                  throw new TestFailed(ie);
              } catch (IllegalAccessException iae) {
                  throw new TestFailed(iae);
              } catch (ClassNotFoundException cnfe) {
                  throw new TestFailed(cnfe);
              }
  
              return null;
          }
  
          /**
           * Load a class.
           *
           * Return null if the class's name is SUPERCLASS_NAME;
           * otherwise invoke the super's loadClass method.
           */
          public Class<?> loadClass(String name, boolean resolve)
                  throws ClassNotFoundException
          {
              if (SUPERCLASS_NAME.equals(name)) {
                  return null;
              }
  
              return super.loadClass(name, resolve);
          }
  
          /**
           * Attempt to find the class with the superclass we refuse to
           * load.  This is expected to throw an
           * InvocationTargetException, with a NullPointerException as
           * its cause.
           */
          public void findBrokenClass()
                  throws TestFailed, InvocationTargetException
          {
              findDexClass(CLASS_NAME);
          }
      }
  
      /**
       * Main entry point.
       */
      public static void main(String[] args)
              throws TestFailed, ClassNotFoundException {
          /*
           * Run test.
           */
          testFailLoadAndGc();
      }
  
      /**
       * See if we can GC after a failed load.
       */
      static void testFailLoadAndGc() throws TestFailed {
          try {
              BrokenDexLoader loader;
  
              loader = new BrokenDexLoader(ClassLoader.getSystemClassLoader());
              loader.findBrokenClass();
              System.err.println("ERROR: Inaccessible was accessible");
          } catch (InvocationTargetException ite) {
              Throwable cause = ite.getCause();
              if (cause instanceof NullPointerException) {
                  System.err.println("Got expected ITE/NPE");
              } else {
                  System.err.println("Got unexpected ITE");
                  ite.printStackTrace();
              }
          }
      }
  }
  