maven-3.0.x/src/main/java/org/apache/maven/shared/transfer/collection/internal/Maven30DependencyCollector.java [64:148]:
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                                       ArtifactHandlerManager artifactHandlerManager )
    {
        this.repositorySystem = Objects.requireNonNull( repositorySystem );
        this.artifactHandlerManager = Objects.requireNonNull( artifactHandlerManager );
    }

    @Override
    public CollectResult collectDependencies( ProjectBuildingRequest buildingRequest,
                                              org.apache.maven.model.Dependency root )
            throws DependencyCollectionException
    {
        ArtifactTypeRegistry typeRegistry = RepositoryUtils.newArtifactTypeRegistry( artifactHandlerManager );

        CollectRequest request = new CollectRequest();
        request.setRoot( toDependency( root, typeRegistry ) );

        return collectDependencies( buildingRequest, request );
    }

    @Override
    public CollectResult collectDependencies( ProjectBuildingRequest buildingRequest,
                                              DependableCoordinate root )
            throws DependencyCollectionException
    {
        ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getType() );

        String extension = artifactHandler != null ? artifactHandler.getExtension() : null;

        Artifact aetherArtifact = new DefaultArtifact( root.getGroupId(), root.getArtifactId(), root.getClassifier(),
                extension, root.getVersion() );

        CollectRequest request = new CollectRequest();
        request.setRoot( new Dependency( aetherArtifact, null ) );

        return collectDependencies( buildingRequest, request );
    }

    @Override
    public CollectResult collectDependencies( ProjectBuildingRequest buildingRequest,
                                              Model root )
            throws DependencyCollectionException
    {
        // Are there examples where packaging and type are NOT in sync
        ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getPackaging() );

        String extension = artifactHandler != null ? artifactHandler.getExtension() : null;

        Artifact aetherArtifact = new DefaultArtifact( root.getGroupId(), root.getArtifactId(), extension,
                root.getVersion() );

        CollectRequest request = new CollectRequest();
        request.setRoot( new Dependency( aetherArtifact, null ) );

        ArtifactTypeRegistry typeRegistry = RepositoryUtils.newArtifactTypeRegistry( artifactHandlerManager );

        List<Dependency> aetherDependencies = new ArrayList<>( root.getDependencies().size() );
        for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencies() )
        {
            aetherDependencies.add( toDependency( mavenDependency, typeRegistry ) );
        }
        request.setDependencies( aetherDependencies );

        if ( root.getDependencyManagement() != null )
        {
            List<Dependency> aetherManagerDependencies = new ArrayList<>(
                    root.getDependencyManagement().getDependencies().size() );

            for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencyManagement().getDependencies() )
            {
                aetherManagerDependencies.add( toDependency( mavenDependency, typeRegistry ) );
            }

            request.setManagedDependencies( aetherManagerDependencies );
        }

        return collectDependencies( buildingRequest, request );
    }

    private CollectResult collectDependencies( ProjectBuildingRequest buildingRequest,
                                               CollectRequest request )
            throws DependencyCollectionException
    {
        request.setRepositories( RepositoryUtils.toRepos( buildingRequest.getRemoteRepositories() ) );

        try
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maven-3.1.x/src/main/java/org/apache/maven/shared/transfer/collection/internal/Maven31DependencyCollector.java [61:145]:
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                                       ArtifactHandlerManager artifactHandlerManager )
    {
        this.repositorySystem = Objects.requireNonNull( repositorySystem );
        this.artifactHandlerManager = Objects.requireNonNull( artifactHandlerManager );
    }

    @Override
    public CollectResult collectDependencies( ProjectBuildingRequest buildingRequest,
                                              org.apache.maven.model.Dependency root )
            throws DependencyCollectionException
    {
        ArtifactTypeRegistry typeRegistry = RepositoryUtils.newArtifactTypeRegistry( artifactHandlerManager );

        CollectRequest request = new CollectRequest();
        request.setRoot( toDependency( root, typeRegistry ) );

        return collectDependencies( buildingRequest, request );
    }

    @Override
    public CollectResult collectDependencies( ProjectBuildingRequest buildingRequest,
                                              DependableCoordinate root )
            throws DependencyCollectionException
    {
        ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getType() );

        String extension = artifactHandler != null ? artifactHandler.getExtension() : null;

        Artifact aetherArtifact = new DefaultArtifact( root.getGroupId(), root.getArtifactId(), root.getClassifier(),
                extension, root.getVersion() );

        CollectRequest request = new CollectRequest();
        request.setRoot( new Dependency( aetherArtifact, null ) );

        return collectDependencies( buildingRequest, request );
    }

    @Override
    public CollectResult collectDependencies( ProjectBuildingRequest buildingRequest,
                                              Model root )
            throws DependencyCollectionException
    {
        // Are there examples where packaging and type are NOT in sync
        ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getPackaging() );

        String extension = artifactHandler != null ? artifactHandler.getExtension() : null;

        Artifact aetherArtifact = new DefaultArtifact( root.getGroupId(), root.getArtifactId(), extension,
                root.getVersion() );

        CollectRequest request = new CollectRequest();
        request.setRoot( new Dependency( aetherArtifact, null ) );

        ArtifactTypeRegistry typeRegistry = RepositoryUtils.newArtifactTypeRegistry( artifactHandlerManager );

        List<Dependency> aetherDependencies = new ArrayList<>( root.getDependencies().size() );
        for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencies() )
        {
            aetherDependencies.add( toDependency( mavenDependency, typeRegistry ) );
        }
        request.setDependencies( aetherDependencies );

        if ( root.getDependencyManagement() != null )
        {
            List<Dependency> aetherManagerDependencies = new ArrayList<>(
                    root.getDependencyManagement().getDependencies().size() );

            for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencyManagement().getDependencies() )
            {
                aetherManagerDependencies.add( toDependency( mavenDependency, typeRegistry ) );
            }

            request.setManagedDependencies( aetherManagerDependencies );
        }

        return collectDependencies( buildingRequest, request );
    }

    private CollectResult collectDependencies( ProjectBuildingRequest buildingRequest,
                                               CollectRequest request )
            throws DependencyCollectionException
    {
        request.setRepositories( RepositoryUtils.toRepos( buildingRequest.getRemoteRepositories() ) );

        try
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