package org.apache.maven.surefire.common.junit48;
   
   /*
    * 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.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Properties;
  import java.util.Set;
  
  import org.apache.maven.shared.utils.io.SelectorUtils;
  import org.apache.maven.surefire.booter.ProviderParameterNames;
  import org.apache.maven.surefire.group.match.AndGroupMatcher;
  import org.apache.maven.surefire.group.match.GroupMatcher;
  import org.apache.maven.surefire.group.match.InverseGroupMatcher;
  import org.apache.maven.surefire.group.parse.GroupMatcherParser;
  import org.apache.maven.surefire.group.parse.ParseException;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.Description;
  import org.junit.runner.manipulation.Filter;
  
  /**
   * @author Todd Lipcon
   */
  public class FilterFactory
  {
      private final ClassLoader testClassLoader;
  
      public FilterFactory( ClassLoader testClassLoader )
      {
          this.testClassLoader = testClassLoader;
      }
  
      public Filter createGroupFilter( Properties providerProperties )
      {
          String groups = providerProperties.getProperty( ProviderParameterNames.TESTNG_GROUPS_PROP );
          String excludedGroups = providerProperties.getProperty( ProviderParameterNames.TESTNG_EXCLUDEDGROUPS_PROP );
  
          GroupMatcher included = null;
          if ( groups != null && groups.trim().length() > 0 )
          {
              try
              {
                  included = new GroupMatcherParser( groups ).parse();
              }
              catch ( ParseException e )
              {
                  throw new IllegalArgumentException( "Invalid group expression: '" + groups + "'. Reason: "
                      + e.getMessage(), e );
              }
          }
  
          GroupMatcher excluded = null;
          if ( excludedGroups != null && excludedGroups.trim().length() > 0 )
          {
              try
              {
                  excluded = new GroupMatcherParser( excludedGroups ).parse();
              }
              catch ( ParseException e )
              {
                  throw new IllegalArgumentException( "Invalid group expression: '" + excludedGroups + "'. Reason: "
                      + e.getMessage(), e );
              }
          }
  
          if ( included != null && testClassLoader != null )
          {
              included.loadGroupClasses( testClassLoader );
          }
  
          if ( excluded != null && testClassLoader != null )
          {
              excluded.loadGroupClasses( testClassLoader );
          }
  
          return new GroupMatcherCategoryFilter( included, excluded );
      }
  
     public Filter createMethodFilter( String requestedTestMethod )
     {
         return new MethodFilter( requestedTestMethod );
     }
 
     public Filter and( Filter filter1, Filter filter2 )
     {
         return new AndFilter( filter1, filter2 );
     }
 
     private static class MethodFilter
         extends Filter
     {
         private final String requestedTestMethod;
 
         public MethodFilter( String requestedTestMethod )
         {
             this.requestedTestMethod = requestedTestMethod;
         }
 
         @Override
         public boolean shouldRun( Description description )
         {
             for ( Description o : description.getChildren() )
             {
                 if ( isDescriptionMatch( o ) )
                 {
                     return true;
                 }
 
             }
             return isDescriptionMatch( description );
         }
 
         private boolean isDescriptionMatch( Description description )
         {
             return description.getMethodName() != null
                 && SelectorUtils.match( requestedTestMethod, description.getMethodName() );
         }
 
         @Override
         public String describe()
         {
             return "By method" + requestedTestMethod;
         }
     }
 
     private static class GroupMatcherCategoryFilter
         extends Filter
     {
 
         private AndGroupMatcher matcher;
 
         public GroupMatcherCategoryFilter( GroupMatcher included, GroupMatcher excluded )
         {
             GroupMatcher invertedExclude = excluded == null ? null : new InverseGroupMatcher( excluded );
             if ( included != null || invertedExclude != null )
             {
                 matcher = new AndGroupMatcher();
                 if ( included != null )
                 {
                     matcher.addMatcher( included );
                 }
 
                 if ( invertedExclude != null )
                 {
                     matcher.addMatcher( invertedExclude );
                 }
             }
         }
 
         @Override
         public boolean shouldRun( Description description )
         {
             if ( description.getMethodName() == null || description.getTestClass() == null )
             {
                 return shouldRun( description, null, null );
             }
             else
             {
                 return shouldRun( description, Description.createSuiteDescription( description.getTestClass() ),
                                   description.getTestClass() );
             }
         }
 
         private Collection<Class<?>> findSuperclassCategories( Class<?> clazz )
         {
             if ( clazz != null && clazz.getSuperclass() != null )
             {
                 Category cat = clazz.getSuperclass().getAnnotation( Category.class );
                 if ( cat != null )
                 {
                     return new HashSet<Class<?>>( Arrays.asList( cat.value() ) );
                 }
                 else
                 {
                     return findSuperclassCategories( clazz.getSuperclass() );
                 }
             }
 
             return Collections.emptySet();
         }
 
         private boolean shouldRun( Description description, Description parent, Class<?> parentClass )
         {
             if ( matcher == null )
             {
                 return true;
             }
 
             Set<Class<?>> cats = new HashSet<Class<?>>();
             Category cat = description.getAnnotation( Category.class );
             if ( cat != null )
             {
                 cats.addAll( Arrays.asList( cat.value() ) );
             }
 
             if ( parent != null )
             {
                 cat = parent.getAnnotation( Category.class );
                 if ( cat != null )
                 {
                     cats.addAll( Arrays.asList( cat.value() ) );
                 }
             }
 
             if ( parentClass != null )
             {
                 cats.addAll( findSuperclassCategories( parentClass ) );
             }
 
             boolean result = matcher.enabled( cats.toArray( new Class<?>[] {} ) );
 
             if ( parent == null )
             {
                 if ( cats.size() == 0 )
                 {
                     result = true;
                 }
                 else if ( !result )
                 {
                     ArrayList<Description> children = description.getChildren();
                     if ( children != null )
                     {
                         for ( Description child : children )
                         {
                             if ( shouldRun( child, description, null ) )
                             {
                                 result = true;
                                 break;
                             }
                         }
                     }
                 }
             }
 
             return result;
         }
 
         @Override
         public String describe()
         {
             return matcher == null ? "ANY" : matcher.toString();
         }
 
     }
 
     private static class AndFilter
         extends Filter
     {
         private final Filter filter1;
 
         private final Filter filter2;
 
         public AndFilter( Filter filter1, Filter filter2 )
         {
             this.filter1 = filter1;
             this.filter2 = filter2;
         }
 
         @Override
         public boolean shouldRun( Description description )
         {
             return filter1.shouldRun( description ) && filter2.shouldRun( description );
         }
 
         @Override
         public String describe()
         {
             return filter1.describe() + " AND " + filter2.describe();
         }
     }
 
     @SuppressWarnings( "unused" )
     private static class CombinedCategoryFilter
         extends Filter
     {
         private final List<Filter> includedFilters;
 
         private final List<Filter> excludedFilters;
 
         public CombinedCategoryFilter( List<Filter> includedFilters, List<Filter> excludedFilters )
         {
             this.includedFilters = includedFilters;
             this.excludedFilters = excludedFilters;
         }
 
         @Override
         public boolean shouldRun( Description description )
         {
             return ( includedFilters.isEmpty() || inOneOfFilters( includedFilters, description ) )
                 && ( excludedFilters.isEmpty() || !inOneOfFilters( excludedFilters, description ) );
         }
 
         private boolean inOneOfFilters( List<Filter> filters, Description description )
         {
             for ( Filter f : filters )
             {
                 if ( f.shouldRun( description ) )
                 {
                     return true;
                 }
             }
             return false;
         }
 
         @Override
         public String describe()
         {
             StringBuilder sb = new StringBuilder();
             if ( !includedFilters.isEmpty() )
             {
                 sb.append( "(" );
                 sb.append( joinFilters( includedFilters, " OR " ) );
                 sb.append( ")" );
                 if ( !excludedFilters.isEmpty() )
                 {
                     sb.append( " AND " );
                 }
             }
             if ( !excludedFilters.isEmpty() )
             {
                 sb.append( "NOT (" );
                 sb.append( joinFilters( includedFilters, " OR " ) );
                 sb.append( ")" );
             }
 
             return sb.toString();
         }
 
         private String joinFilters( List<Filter> filters, String sep )
         {
             int i = 0;
             StringBuilder sb = new StringBuilder();
             for ( Filter f : filters )
             {
                 if ( i++ > 0 )
                 {
                     sb.append( sep );
                 }
                 sb.append( f.describe() );
             }
             return sb.toString();
         }
     }
 
 }