/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.maven.surefire.common.junit4;
  
  import java.lang.annotation.Annotation;
  import java.lang.reflect.Method;
  
  import org.apache.maven.surefire.api.filter.NonAbstractClassFilter;
  import org.apache.maven.surefire.api.util.ScannerFilter;
  import org.apache.maven.surefire.common.junit3.JUnit3TestChecker;
  
  import static org.apache.maven.surefire.api.util.ReflectionUtils.tryLoadClass;
  
  /**
   * @author Kristian Rosenvold
   */
  public class JUnit4TestChecker implements ScannerFilter {
      private final NonAbstractClassFilter nonAbstractClassFilter;
  
      private final Class runWith;
  
      private final JUnit3TestChecker jUnit3TestChecker;
  
      public JUnit4TestChecker(ClassLoader testClassLoader) {
          jUnit3TestChecker = new JUnit3TestChecker(testClassLoader);
          runWith = tryLoadClass(testClassLoader, org.junit.runner.RunWith.class.getName());
          nonAbstractClassFilter = new NonAbstractClassFilter();
      }
  
      @Override
      public boolean accept(Class testClass) {
          return jUnit3TestChecker.accept(testClass) || isValidJUnit4Test(testClass);
      }
  
      @SuppressWarnings({"unchecked"})
      private boolean isValidJUnit4Test(Class testClass) {
          if (!nonAbstractClassFilter.accept(testClass)) {
              return false;
          }
  
          if (isRunWithPresentInClassLoader()) {
              Annotation runWithAnnotation = testClass.getAnnotation(runWith);
              if (runWithAnnotation != null) {
                  return true;
              }
          }
  
          return lookForTestAnnotatedMethods(testClass);
      }
  
      private boolean lookForTestAnnotatedMethods(Class testClass) {
          Class classToCheck = testClass;
          while (classToCheck != null) {
              if (checkforTestAnnotatedMethod(classToCheck)) {
                  return true;
              }
              classToCheck = classToCheck.getSuperclass();
          }
          return false;
      }
  
      public boolean checkforTestAnnotatedMethod(Class testClass) {
          for (Method lMethod : testClass.getDeclaredMethods()) {
              for (Annotation lAnnotation : lMethod.getAnnotations()) {
                  if (org.junit.Test.class.isAssignableFrom(lAnnotation.annotationType())) {
                      return true;
                  }
              }
          }
          return false;
      }
  
      public boolean isRunWithPresentInClassLoader() {
          return runWith != null;
      }
  }