package org.apache.maven.model.path;
   
   /*
    * 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.io.File;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  import java.util.function.Function;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import org.apache.maven.api.model.Build;
  import org.apache.maven.api.model.Model;
  import org.apache.maven.api.model.Reporting;
  import org.apache.maven.api.model.Resource;
  import org.apache.maven.model.building.ModelBuildingRequest;
  
  /**
   * Resolves relative paths within a model against a specific base directory.
   *
   * @author Benjamin Bentmann
   */
  @Named
  @Singleton
  public class DefaultModelPathTranslator
      implements ModelPathTranslator
  {
  
      private final PathTranslator pathTranslator;
  
      @Inject
      public DefaultModelPathTranslator( PathTranslator pathTranslator )
      {
          this.pathTranslator = pathTranslator;
      }
  
      @Override
      public void alignToBaseDirectory( org.apache.maven.model.Model modelV3, File basedir, ModelBuildingRequest request )
      {
          if ( modelV3 == null || basedir == null )
          {
              return;
          }
  
          Model model = modelV3.getDelegate();
          Build build = model.getBuild();
          Build newBuild = null;
          if ( build != null )
          {
              newBuild = Build.newBuilder( build )
                      .directory( alignToBaseDirectory( build.getDirectory(), basedir ) )
                      .sourceDirectory( alignToBaseDirectory( build.getSourceDirectory(), basedir ) )
                      .testSourceDirectory( alignToBaseDirectory( build.getTestSourceDirectory(), basedir ) )
                      .scriptSourceDirectory( alignToBaseDirectory( build.getScriptSourceDirectory(), basedir ) )
                      .resources( map( build.getResources(), r -> alignToBaseDirectory( r, basedir ) ) )
                      .testResources( map( build.getTestResources(), r -> alignToBaseDirectory( r, basedir ) ) )
                      .filters( map( build.getFilters(), s -> alignToBaseDirectory( s, basedir ) ) )
                      .outputDirectory( alignToBaseDirectory( build.getOutputDirectory(), basedir ) )
                      .testOutputDirectory( alignToBaseDirectory( build.getTestOutputDirectory(), basedir ) )
                      .build();
          }
  
          Reporting reporting = model.getReporting();
          Reporting newReporting = null;
          if ( reporting != null )
          {
              newReporting = Reporting.newBuilder( reporting )
                      .outputDirectory( alignToBaseDirectory( reporting.getOutputDirectory(), basedir ) )
                      .build();
          }
          if ( newBuild != build || newReporting != reporting )
          {
              modelV3.update( Model.newBuilder( model )
                      .build( newBuild )
                      .reporting( newReporting )
                      .build() );
          }
      }
  
     private <T> List<T> map( List<T> resources, Function<T, T> mapper )
     {
         List<T> newResources = null;
         if ( resources != null )
         {
             for ( int i = 0; i < resources.size(); i++ )
             {
                 T resource = resources.get( i );
                 T newResource = mapper.apply( resource );
                 if ( newResource != null )
                 {
                     if ( newResources == null )
                     {
                         newResources = new ArrayList<>( resources );
                     }
                     newResources.set( i, newResource );
                 }
             }
         }
         return newResources;
     }
 
     private Resource alignToBaseDirectory( Resource resource, File basedir )
     {
         if ( resource != null )
         {
             String newDir = alignToBaseDirectory( resource.getDirectory(), basedir );
             if ( newDir != null )
             {
                 return resource.withDirectory( newDir );
             }
         }
         return resource;
     }
 
     private String alignToBaseDirectory( String path, File basedir )
     {
         String newPath = pathTranslator.alignToBaseDirectory( path, basedir );
         return Objects.equals( path, newPath ) ? null : newPath;
     }
 
 }