exclusions);
    }

    private static Exclusion toExclusion(org.apache.maven.model.Exclusion exclusion) {
        return new Exclusion(exclusion.getGroupId(), exclusion.getArtifactId(), "*", "*");
    }

    public static ArtifactTypeRegistry newArtifactTypeRegistry(ArtifactHandlerManager handlerManager) {
        return new MavenArtifactTypeRegistry(handlerManager);

                            request.isOptional(),
                            map(request.getExclusions(), this::toExclusion)));
        }
    }

    private org.eclipse.aether.graph.Exclusion toExclusion(Exclusion exclusion) {
        return new org.eclipse.aether.graph.Exclusion(exclusion.getGroupId(), exclusion.getArtifactId(), "*", "*");
    }

    @Override
    public Collection<Exclusion> getExclusions() {
        return new MappedCollection<>(dependency.getExclusions(), this::toExclusion);
    }

    private Exclusion toExclusion(org.eclipse.aether.graph.Exclusion exclusion) {
        return new Exclusion() {
            @Nullable
            @Override
            public String getGroupId() {
                return exclusion.getGroupId();
            }

                            request.isOptional(),
                            map(request.getExclusions(), this::toExclusion)));
        }
    }

    private org.eclipse.aether.graph.Exclusion toExclusion(Exclusion exclusion) {
        return new org.eclipse.aether.graph.Exclusion(exclusion.getGroupId(), exclusion.getArtifactId(), "*", "*");
    }

    @Override
    public Collection<Exclusion> getExclusions() {
        return new MappedCollection<>(dependency.getExclusions(), this::toExclusion);
    }

    private Exclusion toExclusion(org.eclipse.aether.graph.Exclusion exclusion) {
        return new Exclusion() {
            @Nullable
            @Override
            public String getGroupId() {
                return exclusion.getGroupId();
            }

    }

    private static boolean exclusionsEquals(List<Exclusion> a, List<Exclusion> b) {
        if (a.size() != b.size()) {
            return false;
        }

        Iterator<Exclusion> aI = a.iterator();
        Iterator<Exclusion> bI = b.iterator();

        while (aI.hasNext()) {
            Exclusion aD = aI.next();
            Exclusion bD = bI.next();

            return addDependency(groupId, artifactId, version, scope, (Exclusion) null);
        }

        public ProjectBuilder addDependency(
                String groupId, String artifactId, String version, String scope, Exclusion exclusion) {
            return addDependency(groupId, artifactId, version, scope, null, exclusion);
        }

        public ProjectBuilder addDependency(

        MavenProject project = session.getCurrentProject();

        Exclusion exclusion = new Exclusion();
        exclusion.setGroupId( "org.apache.maven.its" );
        exclusion.setArtifactId( "a" );

        new ProjectBuilder( project ).addDependency( "org.apache.maven.its", "b", "0.1", Artifact.SCOPE_RUNTIME,
                                                     exclusion );

        Set<Artifact> artifactDependencies =

            for (Exclusion exclusion : d.getExclusions()) {
                if (request.getValidationLevel() < ModelBuilderRequest.VALIDATION_LEVEL_MAVEN_3_0) {
                    validateCoordinateId(
                            prefix,
                            "exclusions.exclusion.groupId",
                            problems,

        @Override
        protected void mergeDependency_Exclusions(
                Dependency.Builder builder,
                Dependency target,
                Dependency source,
                boolean sourceDominant,
                Map<Object, Object> context) {
            List<Exclusion> tgt = target.getExclusions();
            if (tgt.isEmpty()) {
                List<Exclusion> src = source.getExclusions();