package org.apache.maven.lifecycle.internal;
   
   /*
    * 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.HashMap;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.maven.artifact.ArtifactUtils;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.project.MavenProject;
  
  /**
   * <p>
   * A list of project segments, ordered so that all ProjectSegments from first TaskSegment come before any
   * subsequent TaskSegments.
   * </p>
   * <strong>Note:</strong> This interface is part of work in progress and can be changed or removed without notice.
   *
   * @since 3.0
   * @author Kristian Rosenvold
   */
  public class ProjectBuildList
      implements Iterable<ProjectSegment>
  {
      private final List<ProjectSegment> items;
  
      public ProjectBuildList( List<ProjectSegment> items )
      {
          this.items = Collections.unmodifiableList( items );
      }
  
      // TODO Optimize; or maybe just rewrite the whole way aggregating mojos are being run.
      /**
       * Returns aProjectBuildList that contains only items for the specified taskSegment
       * @param taskSegment the requested tasksegment
       * @return a project build list for the supplied task segment
       */
      public ProjectBuildList getByTaskSegment( TaskSegment taskSegment )
      {
          List<ProjectSegment> currentSegment = new ArrayList<>();
          for ( ProjectSegment projectBuild : items )
          {
              if ( taskSegment == projectBuild.getTaskSegment() )
              { // NOTE: There's no notion of taskSegment equality.
                  currentSegment.add( projectBuild );
              }
          }
          return new ProjectBuildList( currentSegment );
      }
  
      public Map<MavenProject, ProjectSegment> selectSegment( TaskSegment taskSegment )
      {
          Map<MavenProject, ProjectSegment> result = new HashMap<>();
          for ( ProjectSegment projectBuild : items )
          {
              if ( taskSegment == projectBuild.getTaskSegment() )
              { // NOTE: There's no notion of taskSegment equality.
                  result.put( projectBuild.getProject(), projectBuild );
              }
          }
          return result;
      }
  
      /**
       * Finds the first ProjectSegment matching the supplied project
       * @param mavenProject the requested project
       * @return The projectSegment or null.
       */
      public ProjectSegment findByMavenProject( MavenProject mavenProject )
      {
          for ( ProjectSegment projectBuild : items )
          {
              if ( mavenProject.equals( projectBuild.getProject() ) )
              {
                  return projectBuild;
              }
         }
         return null;
     }
 
     public Iterator<ProjectSegment> iterator()
     {
         return items.iterator();
     }
 
     public void closeAll()
     {
         for ( ProjectSegment item : items )
         {
             MavenSession sessionForThisModule = item.getSession();
             sessionForThisModule.setCurrentProject( null );
         }
     }
 
     public int size()
     {
         return items.size();
     }
 
     public ProjectSegment get( int index )
     {
         return items.get( index );
     }
 
     public Set<String> getReactorProjectKeys()
     {
         Set<String> projectKeys = new HashSet<>( items.size() * 2 );
         for ( ProjectSegment projectBuild : items )
         {
             MavenProject project = projectBuild.getProject();
             String key = ArtifactUtils.key( project.getGroupId(), project.getArtifactId(), project.getVersion() );
             projectKeys.add( key );
         }
         return projectKeys;
     }
 
 
     public boolean isEmpty()
     {
         return items.isEmpty();
     }
 
     /**
      * @return a set of all the projects managed by the build
      */
     public Set<MavenProject> getProjects()
     {
         Set<MavenProject> projects = new HashSet<>();
 
         for ( ProjectSegment s : items )
         {
             projects.add( s.getProject() );
         }
         return projects;
     }
 }