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.runner.suites;
  
  import static androidx.test.internal.runner.ClassPathScanner.getDefaultClasspaths;
  import static androidx.test.platform.app.InstrumentationRegistry.getInstrumentation;
  
  import androidx.annotation.RestrictTo;
  import androidx.annotation.RestrictTo.Scope;
  import androidx.test.internal.runner.ClassPathScanner;
  import androidx.test.internal.runner.ClassPathScanner.ChainedClassNameFilter;
  import androidx.test.internal.runner.ClassPathScanner.ExternalClassNameFilter;
  import androidx.test.internal.runner.ClassPathScanner.InclusivePackageNamesFilter;
  import androidx.test.internal.runner.ErrorReportingRunner;
  import androidx.test.internal.runner.TestLoader;
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.List;
  import org.junit.runner.Runner;
  import org.junit.runners.Suite;
  import org.junit.runners.model.InitializationError;
  import org.junit.runners.model.RunnerBuilder;
  
  /**
   * An alternative to {@link AndroidClasspathSuite} that ignores classes whose java package is not
   * within the current class's java package.
   *
   * <p>Example usage: * *
   *
   * <pre>
   * package com.example.foo;
   *
   * {@literal @}RunWith(PackagePrefixClasspathSuite.class)
   * public class AllTests {
   * }
   * </pre>
   *
   * <p>This class was intended for large applications using {@link AndroidClasspathSuite} results in
   * LinearAlloc errors (b/36936369) and performance overhead when scanning the entire classpath.
   */
  public final class PackagePrefixClasspathSuite extends Suite {
  
    /**
     * Only called reflectively. Do not use programmatically.
     *
     * @hide
     */
    @RestrictTo(Scope.LIBRARY)
    public PackagePrefixClasspathSuite(Class<?> klass, RunnerBuilder builder)
        throws InitializationError {
      super(klass, getRunnersForClasses(klass, builder));
    }
  
    private static List<Runner> getRunnersForClasses(Class<?> klass, RunnerBuilder builder) {
      try {
        ChainedClassNameFilter filter = new ChainedClassNameFilter();
        filter.add(new InclusivePackageNamesFilter(Arrays.asList(klass.getPackage().getName())));
        filter.add(new ExternalClassNameFilter());
        Collection<String> classNames =
            new ClassPathScanner(getDefaultClasspaths(getInstrumentation()))
                .getClassPathEntries(filter);
        classNames.remove(klass.getName());
        return TestLoader.Factory.create(null, builder, true).getRunnersFor(classNames);
      } catch (IOException e) {
        return Arrays.asList(
            new ErrorReportingRunner(
                getInstrumentation().getContext().getPackageName(),
                new RuntimeException(
                    "Failed to perform classpath scanning to determine tests to run", e)));
      }
    }
  }
  