package org.apache.maven.surefire.common.junit4;
   
   /*
    * 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.
   */
  
  import java.lang.annotation.Annotation;
  import java.lang.reflect.Method;
  import org.apache.maven.surefire.NonAbstractClassFilter;
  import org.apache.maven.surefire.common.junit3.JUnit3TestChecker;
  import org.apache.maven.surefire.util.ReflectionUtils;
  import org.apache.maven.surefire.util.ScannerFilter;
  
  /**
   * @author Kristian Rosenvold
   */
  public class JUnit4TestChecker
      implements ScannerFilter
  {
      private final NonAbstractClassFilter nonAbstractClassFilter;
  
      private final Class runWith;
  
      private final JUnit3TestChecker jUnit3TestChecker;
  
  
      public JUnit4TestChecker( ClassLoader testClassLoader )
      {
          this.jUnit3TestChecker = new JUnit3TestChecker( testClassLoader );
          this.runWith = getJUnitClass( testClassLoader, org.junit.runner.RunWith.class.getName() );
          this.nonAbstractClassFilter = new NonAbstractClassFilter();
      }
  
      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 ( runWith != null )
          {
              Annotation runWithAnnotation = testClass.getAnnotation( runWith );
              if ( runWithAnnotation != null )
              {
                  return true;
              }
          }
  
          Class classToCheck = testClass;
          while ( classToCheck != null )
          {
              if ( checkforTestAnnotatedMethod( classToCheck ) )
              {
                  return true;
              }
              classToCheck = classToCheck.getSuperclass();
          }
          return false;
      }
  
      private 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;
      }
  
      private Class getJUnitClass( ClassLoader classLoader, String className )
      {
         return ReflectionUtils.tryLoadClass( classLoader, className );
     }
 
 }