content: /*
   * Copyright (C) 2021 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.
   */
  
  package androidx.test.internal.runner;
  
  import android.util.Log;
  import org.junit.runner.Runner;
  import org.junit.runners.model.RunnerBuilder;
  
  /**
   * A class for loading JUnit3 and JUnit4 test classes given a set of class names.
   *
   * <p>This variant of TestLoader will strictly report any errors loading the class.
   */
  class DirectTestLoader extends TestLoader {
  
    private static final String LOG_TAG = "DirectTestLoader";
  
    private final ClassLoader classLoader;
    private final RunnerBuilder runnerBuilder;
  
    DirectTestLoader(ClassLoader classLoader, RunnerBuilder runnerBuilder) {
      this.classLoader = classLoader;
      this.runnerBuilder = runnerBuilder;
    }
  
    @Override
    protected Runner doCreateRunner(String className) {
      // this method should always return a non-null runner.
      try {
        Class<?> loadedClass = Class.forName(className, false, classLoader);
        return runnerBuilder.safeRunnerForClass(loadedClass);
        // Can get NoClassDefFoundError on Android L when a class extends a non-existent class.
      } catch (ClassNotFoundException | LinkageError e) {
        String msg = String.format("Failed loading specified test class '%s'", className);
        Log.e(LOG_TAG, msg, e);
        return new ErrorReportingRunner(className, new RuntimeException(msg, e));
      }
    }
  }
  