package org.apache.maven.index.locator;
   
   /*
    * 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.io.IOException;
  import java.io.InputStream;
  import java.nio.file.Files;
  
  import org.apache.maven.index.artifact.ArtifactPackagingMapper;
  import org.apache.maven.index.artifact.Gav;
  import org.apache.maven.index.artifact.GavCalculator;
  import org.apache.maven.model.Model;
  import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
  import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Artifact locator.
   * 
   * @author Damian Bradicich
   */
  public class ArtifactLocator
      implements GavHelpedLocator
  {
  
      private static final Logger LOGGER = LoggerFactory.getLogger( ArtifactLocator.class );
  
      private final ArtifactPackagingMapper mapper;
  
      public ArtifactLocator( ArtifactPackagingMapper mapper )
      {
          this.mapper = mapper;
      }
  
      public File locate( File source, GavCalculator gavCalculator, Gav gav )
      {
          // if we don't have this data, nothing we can do
          if ( source == null //
              || !source.exists() //
              || gav == null //
              || gav.getArtifactId() == null //
              || gav.getVersion() == null )
          {
              return null;
          }
  
          try ( InputStream inputStream = Files.newInputStream( source.toPath() ) )
          {
              // need to read the pom model to get packaging
              final Model model = new MavenXpp3Reader().read( inputStream, false );
  
              if ( model == null )
              {
                  return null;
              }
  
              // now generate the artifactname
              String artifactName =
                  gav.getArtifactId() + "-" + gav.getVersion() + "."
                      + mapper.getExtensionForPackaging( model.getPackaging() );
  
              File artifact = new File( source.getParent(), artifactName );
  
              if ( !artifact.exists() )
              {
                  return null;
              }
  
              return artifact;
          }
          catch ( XmlPullParserException | IOException e )
          {
              LOGGER.warn( "skip error reading pom from file:" + source, e );
              return null;
          }
      }
  }