Package org.junit.runners

Source Code of org.junit.runners.ParentRunner

package org.junit.runners;

import static org.junit.internal.runners.rules.RuleFieldValidator.CLASS_RULE_VALIDATOR;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.ClassRule;
import org.junit.Rule;
import org.junit.internal.AssumptionViolatedException;
import org.junit.internal.runners.model.EachTestNotifier;
import org.junit.internal.runners.statements.RunAfters;
import org.junit.internal.runners.statements.RunBefores;
import org.junit.rules.RunRules;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runner.Runner;
import org.junit.runner.manipulation.Filter;
import org.junit.runner.manipulation.Filterable;
import org.junit.runner.manipulation.NoTestsRemainException;
import org.junit.runner.manipulation.Sortable;
import org.junit.runner.manipulation.Sorter;
import org.junit.runner.notification.RunNotifier;
import org.junit.runner.notification.StoppedByUserException;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.MultipleFailureException;
import org.junit.runners.model.RunnerScheduler;
import org.junit.runners.model.Statement;
import org.junit.runners.model.TestClass;

/**
* Provides most of the functionality specific to a Runner that implements a
* "parent node" in the test tree, with children defined by objects of some data
* type {@code T}. (For {@link BlockJUnit4ClassRunner}, {@code T} is
* {@link Method} . For {@link Suite}, {@code T} is {@link Class}.) Subclasses
* must implement finding the children of the node, describing each child, and
* running each child. ParentRunner will filter and sort children, handle
* {@code @BeforeClass} and {@code @AfterClass} methods,
* handle annotated {@link ClassRule}s, create a composite
* {@link Description}, and run children sequentially.
*/
public abstract class ParentRunner<T> extends Runner implements Filterable,
    Sortable {
  private final TestClass fTestClass;

  private Sorter fSorter= Sorter.NULL;

  private List<T> fFilteredChildren= null;
 
  private RunnerScheduler fScheduler= new RunnerScheduler() { 
    public void schedule(Runnable childStatement) {
      childStatement.run();
    }
 
    public void finished() {
      // do nothing
    }
  };

  /**
   * Constructs a new {@code ParentRunner} that will run {@code @TestClass}
   * @throws InitializationError
   */
  protected ParentRunner(Class<?> testClass) throws InitializationError {
    fTestClass= new TestClass(testClass);
    validate();
  }

  //
  // Must be overridden
  //

  /**
   * Returns a list of objects that define the children of this Runner.
   */
  protected abstract List<T> getChildren();

  /**
   * Returns a {@link Description} for {@code child}, which can be assumed to
   * be an element of the list returned by {@link ParentRunner#getChildren()}
   */
  protected abstract Description describeChild(T child);

  /**
   * Runs the test corresponding to {@code child}, which can be assumed to be
   * an element of the list returned by {@link ParentRunner#getChildren()}.
   * Subclasses are responsible for making sure that relevant test events are
   * reported through {@code notifier}
   */
  protected abstract void runChild(T child, RunNotifier notifier);
   
  //
  // May be overridden
  //
 
  /**
   * Adds to {@code errors} a throwable for each problem noted with the test class (available from {@link #getTestClass()}).
   * Default implementation adds an error for each method annotated with
   * {@code @BeforeClass} or {@code @AfterClass} that is not
   * {@code public static void} with no arguments.
   */
  protected void collectInitializationErrors(List<Throwable> errors) {
    validatePublicVoidNoArgMethods(BeforeClass.class, true, errors);
    validatePublicVoidNoArgMethods(AfterClass.class, true, errors);
    validateClassRules(errors);
  }

  /**
   * Adds to {@code errors} if any method in this class is annotated with
   * {@code annotation}, but:
   * <ul>
   * <li>is not public, or
   * <li>takes parameters, or
   * <li>returns something other than void, or
   * <li>is static (given {@code isStatic is false}), or
   * <li>is not static (given {@code isStatic is true}).
   */
  protected void validatePublicVoidNoArgMethods(Class<? extends Annotation> annotation,
      boolean isStatic, List<Throwable> errors) {
    List<FrameworkMethod> methods= getTestClass().getAnnotatedMethods(annotation);

    for (FrameworkMethod eachTestMethod : methods)
      eachTestMethod.validatePublicVoidNoArg(isStatic, errors);
  }

  private void validateClassRules(List<Throwable> errors) {
    CLASS_RULE_VALIDATOR.validate(getTestClass(), errors);
  }

  /**
   * Constructs a {@code Statement} to run all of the tests in the test class. Override to add pre-/post-processing.
   * Here is an outline of the implementation:
   * <ul>
   * <li>Call {@link #runChild(Object, RunNotifier)} on each object returned by {@link #getChildren()} (subject to any imposed filter and sort).</li>
   * <li>ALWAYS run all non-overridden {@code @BeforeClass} methods on this class
   * and superclasses before the previous step; if any throws an
   * Exception, stop execution and pass the exception on.
   * <li>ALWAYS run all non-overridden {@code @AfterClass} methods on this class
   * and superclasses before any of the previous steps; all AfterClass methods are
   * always executed: exceptions thrown by previous steps are combined, if
   * necessary, with exceptions from AfterClass methods into a
   * {@link MultipleFailureException}.
   * </ul>
   * @param notifier
   * @return {@code Statement}
   */
  protected Statement classBlock(final RunNotifier notifier) {
    Statement statement= childrenInvoker(notifier);
    statement= withBeforeClasses(statement);
    statement= withAfterClasses(statement);
    statement= withClassRules(statement);
    return statement;
  }

  /**
   * Returns a {@link Statement}: run all non-overridden {@code @BeforeClass} methods on this class
   * and superclasses before executing {@code statement}; if any throws an
   * Exception, stop execution and pass the exception on.
   */
  protected Statement withBeforeClasses(Statement statement) {
    List<FrameworkMethod> befores= fTestClass
        .getAnnotatedMethods(BeforeClass.class);
    return befores.isEmpty() ? statement :
      new RunBefores(statement, befores, null);
  }

  /**
   * Returns a {@link Statement}: run all non-overridden {@code @AfterClass} methods on this class
   * and superclasses before executing {@code statement}; all AfterClass methods are
   * always executed: exceptions thrown by previous steps are combined, if
   * necessary, with exceptions from AfterClass methods into a
   * {@link MultipleFailureException}.
   */
  protected Statement withAfterClasses(Statement statement) {
    List<FrameworkMethod> afters= fTestClass
        .getAnnotatedMethods(AfterClass.class);
    return afters.isEmpty() ? statement :
      new RunAfters(statement, afters, null);
  }

  /**
   * Returns a {@link Statement}: apply all
   * static fields assignable to {@link TestRule}
   * annotated with {@link ClassRule}.
   *
   * @param statement
   *            the base statement
   * @return a RunRules statement if any class-level {@link Rule}s are
   *         found, or the base statement
   */
  private Statement withClassRules(Statement statement) {
    List<TestRule> classRules= classRules();
    return classRules.isEmpty() ? statement :
        new RunRules(statement, classRules, getDescription());
  }

  /**
   * @return the {@code ClassRule}s that can transform the block that runs
   *         each method in the tested class.
   */
  protected List<TestRule> classRules() {
    return fTestClass.getAnnotatedFieldValues(null, ClassRule.class, TestRule.class);
  }

  /**
   * Returns a {@link Statement}: Call {@link #runChild(Object, RunNotifier)}
   * on each object returned by {@link #getChildren()} (subject to any imposed
   * filter and sort)
   */
  protected Statement childrenInvoker(final RunNotifier notifier) {
    return new Statement() {
      @Override
      public void evaluate() {
        runChildren(notifier);
      }
    };
  }

  private void runChildren(final RunNotifier notifier) {
    for (final T each : getFilteredChildren())
       fScheduler.schedule(new Runnable() {     
        public void run() {
          ParentRunner.this.runChild(each, notifier);
        }
      });
    fScheduler.finished();
  }

  /**
   * Returns a name used to describe this Runner
   */
  protected String getName() {
    return fTestClass.getName();
  }

  //
  // Available for subclasses
  //

  /**
   * Returns a {@link TestClass} object wrapping the class to be executed.
   */
  public final TestClass getTestClass() {
    return fTestClass;
  }

  /**
   * Runs a {@link Statement} that represents a leaf (aka atomic) test.
   */
  protected final void runLeaf(Statement statement, Description description,
      RunNotifier notifier) {
    EachTestNotifier eachNotifier= new EachTestNotifier(notifier, description);
    eachNotifier.fireTestStarted();
    try {
        statement.evaluate();
    } catch (AssumptionViolatedException e) {
      eachNotifier.addFailedAssumption(e);
    } catch (Throwable e) {
      eachNotifier.addFailure(e);
    } finally {
      eachNotifier.fireTestFinished();
    }
  }
 
  //
  // Implementation of Runner
  //
 
  @Override
  public Description getDescription() {
    Description description= Description.createSuiteDescription(getName(),
        fTestClass.getAnnotations());
    for (T child : getFilteredChildren())
      description.addChild(describeChild(child));
    return description;
  }

  @Override
  public void run(final RunNotifier notifier) {
    EachTestNotifier testNotifier= new EachTestNotifier(notifier,
        getDescription());
    try {
      Statement statement= classBlock(notifier);
      statement.evaluate();
    } catch (AssumptionViolatedException e) {
      testNotifier.fireTestIgnored();
    } catch (StoppedByUserException e) {
      throw e;
    } catch (Throwable e) {
      testNotifier.addFailure(e);
    }
  }

  //
  // Implementation of Filterable and Sortable
  //

  public void filter(Filter filter) throws NoTestsRemainException {
    for (Iterator<T> iter = getFilteredChildren().iterator(); iter.hasNext(); ) {
      T each = iter.next();
      if (shouldRun(filter, each))
        try {
          filter.apply(each);
        } catch (NoTestsRemainException e) {
          iter.remove();
        }
      else
        iter.remove();
    }
      if (getFilteredChildren().isEmpty()) {
          throw new NoTestsRemainException();
      }
  }

  public void sort(Sorter sorter) {
    fSorter= sorter;
    for (T each : getFilteredChildren())
      sortChild(each);
    Collections.sort(getFilteredChildren(), comparator());
  }

  //
  // Private implementation
  //

  private void validate() throws InitializationError {
    List<Throwable> errors= new ArrayList<Throwable>();
    collectInitializationErrors(errors);
    if (!errors.isEmpty())
      throw new InitializationError(errors);
  }

  private List<T> getFilteredChildren() {
    if (fFilteredChildren == null)
      fFilteredChildren = new ArrayList<T>(getChildren());
    return fFilteredChildren;
  }

  private void sortChild(T child) {
    fSorter.apply(child);
  }

  private boolean shouldRun(Filter filter, T each) {
    return filter.shouldRun(describeChild(each));
  }

  private Comparator<? super T> comparator() {
    return new Comparator<T>() {
      public int compare(T o1, T o2) {
        return fSorter.compare(describeChild(o1), describeChild(o2));
      }
    };
  }

  /**
   * Sets a scheduler that determines the order and parallelization
   * of children.  Highly experimental feature that may change.
   */
  public void setScheduler(RunnerScheduler scheduler) {
    this.fScheduler = scheduler;
  }
}
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