content: /*
   * 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.
   *
   *
   */
  
  package androidx.test.internal.runner.junit4.statement;
  
  import java.util.List;
  import java.util.concurrent.atomic.AtomicReference;
  import org.junit.runners.model.FrameworkMethod;
  import org.junit.runners.model.Statement;
  
  /** <code>@UiThreadTest</code> aware implementation of {@link RunBefores}. */
  public class RunBefores extends UiThreadStatement {
    private final Statement next;
  
    private final Object target;
  
    private final List<FrameworkMethod> befores;
  
    /**
     * Run all non-overridden {@code @Before} methods on this class and superclasses before running
     * {@code next}; if any throws an Exception, stop execution and pass the exception on.
     *
     * <p>{@code @Before} methods that also annotated with <code>@UiThreadTest</code> will be executed
     * on the UI Thread.
     *
     * @param next the original statement
     * @param befores methods annotated with {@code @Before}
     * @param target the test case instance
     */
    public RunBefores(
        FrameworkMethod method, Statement next, List<FrameworkMethod> befores, Object target) {
      super(next, shouldRunOnUiThread(method));
      this.next = next;
      this.befores = befores;
      this.target = target;
    }
  
    @Override
    public void evaluate() throws Throwable {
      final AtomicReference<Throwable> exceptionRef = new AtomicReference<>();
      for (final FrameworkMethod before : befores) {
        if (shouldRunOnUiThread(before)) {
          runOnUiThread(
              new Runnable() {
                @Override
                public void run() {
                  try {
                    before.invokeExplosively(target);
                  } catch (Throwable throwable) {
                    exceptionRef.set(throwable);
                  }
                }
              });
  
          // if any Exception thrown, stop execution and pass the exception on.
          Throwable throwable = exceptionRef.get();
          if (throwable != null) {
            throw throwable;
          }
        } else {
          before.invokeExplosively(target);
        }
      }
  
      next.evaluate();
    }
  }
  