package org.apache.maven.model.profile;
   
   /*
    * 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.Collection;
  import java.util.HashSet;
  import java.util.List;
  
  import org.apache.maven.model.Activation;
  import org.apache.maven.model.Profile;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.building.ModelProblem.Severity;
  import org.apache.maven.model.building.ModelProblem.Version;
  import org.apache.maven.model.building.ModelProblemCollectorRequest;
  import org.apache.maven.model.profile.activation.ProfileActivator;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  
  /**
   * Calculates the active profiles among a given collection of profiles.
   * 
   * @author Benjamin Bentmann
   */
  @Component( role = ProfileSelector.class )
  public class DefaultProfileSelector
      implements ProfileSelector
  {
  
      @Requirement( role = ProfileActivator.class )
      private List<ProfileActivator> activators = new ArrayList<ProfileActivator>();
  
      public DefaultProfileSelector addProfileActivator( ProfileActivator profileActivator )
      {
          if ( profileActivator != null )
          {
              activators.add( profileActivator );
          }
          return this;
      }
  
      public List<Profile> getActiveProfiles( Collection<Profile> profiles, ProfileActivationContext context,
                                              ModelProblemCollector problems )
      {
          Collection<String> activatedIds = new HashSet<String>( context.getActiveProfileIds() );
          Collection<String> deactivatedIds = new HashSet<String>( context.getInactiveProfileIds() );
  
          List<Profile> activeProfiles = new ArrayList<Profile>( profiles.size() );
          List<Profile> activePomProfilesByDefault = new ArrayList<Profile>();
          boolean activatedPomProfileNotByDefault = false;
  
          for ( Profile profile : profiles )
          {
              if ( !deactivatedIds.contains( profile.getId() ) )
              {
                  if ( activatedIds.contains( profile.getId() ) || isActive( profile, context, problems ) )
                  {
                      activeProfiles.add( profile );
  
                      if ( Profile.SOURCE_POM.equals( profile.getSource() ) )
                      {
                          activatedPomProfileNotByDefault = true;
                      }
                  }
                  else if ( isActiveByDefault( profile ) )
                  {
                      if ( Profile.SOURCE_POM.equals( profile.getSource() ) )
                      {
                          activePomProfilesByDefault.add( profile );
                      }
                      else
                      {
                          activeProfiles.add( profile );
                      }
                  }
  
              }
          }
  
          if ( !activatedPomProfileNotByDefault )
          {
              activeProfiles.addAll( activePomProfilesByDefault );
         }
 
         return activeProfiles;
     }
 
     private boolean isActive( Profile profile, ProfileActivationContext context, ModelProblemCollector problems )
     {
         for ( ProfileActivator activator : activators )
         {
             try
             {
                 if ( activator.isActive( profile, context, problems ) )
                 {
                     return true;
                 }
             }
             catch ( RuntimeException e )
             {
                 problems.add( new ModelProblemCollectorRequest( Severity.ERROR, Version.BASE )
                         .setMessage( "Failed to determine activation for profile " + profile.getId() )
                         .setLocation( profile.getLocation( "" ) )
                         .setException( e ) );
                 return false;
             }
         }
         return false;
     }
 
     private boolean isActiveByDefault( Profile profile )
     {
         Activation activation = profile.getActivation();
         return activation != null && activation.isActiveByDefault();
     }
 
 }