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.Collections;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.model.Build;
  import org.apache.maven.model.BuildBase;
  import org.apache.maven.model.Model;
  import org.apache.maven.model.ModelBase;
  import org.apache.maven.model.Plugin;
  import org.apache.maven.model.PluginContainer;
  import org.apache.maven.model.Profile;
  import org.apache.maven.model.ReportPlugin;
  import org.apache.maven.model.Reporting;
  import org.apache.maven.model.building.ModelBuildingRequest;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.merge.MavenModelMerger;
  import org.codehaus.plexus.component.annotations.Component;
  
  /**
   * Handles profile injection into the model.
   *
   * @author Benjamin Bentmann
   */
  @Component( role = ProfileInjector.class )
  public class DefaultProfileInjector
      implements ProfileInjector
  {
  
      private ProfileModelMerger merger = new ProfileModelMerger();
  
      public void injectProfile( Model model, Profile profile, ModelBuildingRequest request,
                                 ModelProblemCollector problems )
      {
          if ( profile != null )
          {
              merger.mergeModelBase( model, profile );
  
              if ( profile.getBuild() != null )
              {
                  if ( model.getBuild() == null )
                  {
                      model.setBuild( new Build() );
                  }
                  merger.mergeBuildBase( model.getBuild(), profile.getBuild() );
              }
          }
      }
  
      private static class ProfileModelMerger
          extends MavenModelMerger
      {
  
          public void mergeModelBase( ModelBase target, ModelBase source )
          {
              mergeModelBase( target, source, true, Collections.emptyMap() );
          }
  
          public void mergeBuildBase( BuildBase target, BuildBase source )
          {
              mergeBuildBase( target, source, true, Collections.emptyMap() );
          }
  
          @Override
          protected void mergePluginContainer_Plugins( PluginContainer target, PluginContainer source,
                                                       boolean sourceDominant, Map<Object, Object> context )
          {
              List<Plugin> src = source.getPlugins();
              if ( !src.isEmpty() )
              {
                  List<Plugin> tgt = target.getPlugins();
                  Map<Object, Plugin> master = new LinkedHashMap<Object, Plugin>( tgt.size() * 2 );
  
                  for ( Plugin element : tgt )
                  {
                      Object key = getPluginKey( element );
                      master.put( key, element );
                 }
 
                 Map<Object, List<Plugin>> predecessors = new LinkedHashMap<Object, List<Plugin>>();
                 List<Plugin> pending = new ArrayList<Plugin>();
                 for ( Plugin element : src )
                 {
                     Object key = getPluginKey( element );
                     Plugin existing = master.get( key );
                     if ( existing != null )
                     {
                         mergePlugin( existing, element, sourceDominant, context );
 
                         if ( !pending.isEmpty() )
                         {
                             predecessors.put( key, pending );
                             pending = new ArrayList<Plugin>();
                         }
                     }
                     else
                     {
                         pending.add( element );
                     }
                 }
 
                 List<Plugin> result = new ArrayList<Plugin>( src.size() + tgt.size() );
                 for ( Map.Entry<Object, Plugin> entry : master.entrySet() )
                 {
                     List<Plugin> pre = predecessors.get( entry.getKey() );
                     if ( pre != null )
                     {
                         result.addAll( pre );
                     }
                     result.add( entry.getValue() );
                 }
                 result.addAll( pending );
 
                 target.setPlugins( result );
             }
         }
 
         @Override
         protected void mergeReporting_Plugins( Reporting target, Reporting source, boolean sourceDominant,
                                                Map<Object, Object> context )
         {
             List<ReportPlugin> src = source.getPlugins();
             if ( !src.isEmpty() )
             {
                 List<ReportPlugin> tgt = target.getPlugins();
                 Map<Object, ReportPlugin> merged =
                     new LinkedHashMap<Object, ReportPlugin>( ( src.size() + tgt.size() ) * 2 );
 
                 for ( ReportPlugin element : tgt )
                 {
                     Object key = getReportPluginKey( element );
                     merged.put( key, element );
                 }
 
                 for ( ReportPlugin element : src )
                 {
                     Object key = getReportPluginKey( element );
                     ReportPlugin existing = merged.get( key );
                     if ( existing == null )
                     {
                         merged.put( key, element );
                     }
                     else
                     {
                         mergeReportPlugin( existing, element, sourceDominant, context );
                     }
                 }
 
                 target.setPlugins( new ArrayList<ReportPlugin>( merged.values() ) );
             }
         }
 
     }
 
 }