dependency.getOptional() != null ? dependency.isOptional() : null,
                exclusions);
    }

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

    private void setArtifactProperties(ArtifactDescriptorResult result, Model model) {
        String downloadUrl = null;

import org.apache.maven.model.Exclusion;

/**
 * Filter to exclude from a list of artifact patterns.
 */
public class ExclusionArtifactFilter implements ArtifactFilter {

    private final List<Exclusion> exclusions;
    private final List<Predicate<Artifact>> predicates;

    public ExclusionArtifactFilter(List<Exclusion> exclusions) {
        this.exclusions = exclusions;
        this.predicates =

        <version>0.1</version>
        <type>war</type>
        <scope>runtime</scope>
        <exclusions>
          <exclusion>
            <groupId>org.apache.maven.its</groupId>
            <artifactId>excluded-managed-dep</artifactId>
          </exclusion>
        </exclusions>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <dependencies>
    <dependency>

                && equals(d1.getExclusions(), d2.getExclusions());
    }

    private boolean equals(Collection<Exclusion> ce1, Collection<Exclusion> ce2) {
        if (ce1.size() == ce2.size()) {
            Iterator<Exclusion> i1 = ce1.iterator();
            Iterator<Exclusion> i2 = ce2.iterator();
            while (i1.hasNext() && i2.hasNext()) {
                if (!equals(i1.next(), i2.next())) {

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

            private Exclusion toExclusion(org.apache.maven.api.model.Exclusion exclusion) {
                return new Exclusion() {
                    @Nullable
                    @Override

        <scope>provided</scope>
        <version>${plexus.version}</version>
        <exclusions>
          <exclusion>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging-api</artifactId>
          </exclusion>
        </exclusions>
      </dependency>
    </dependencies>
  </dependencyManagement>

        <artifactId>maven-core-it-support</artifactId>
        <version>1.3</version>
        <scope>runtime</scope>
        <exclusions>
          <exclusion>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
          </exclusion>
        </exclusions>
      </dependency>
    </dependencies>
  </dependencyManagement>

        /*

        Logic for transitive global exclusions

        List<String> exclusions = new ArrayList<String>();

        for ( Dependency d : project.getDependencies() )
        {
            if ( d.getExclusions() != null )
            {
                for ( Exclusion e : d.getExclusions() )
                {
                    exclusions.add(  e.getGroupId() + ":" + e.getArtifactId() );
                }

package org.apache.maven.artifact.resolver.filter;

import java.util.List;

import org.apache.maven.artifact.Artifact;

/**
 * Filter to exclude from a list of artifact patterns.
 *
 * TODO I think this is equiv. to exclusion set filter in maven-core
 */
public class ExcludesArtifactFilter extends IncludesArtifactFilter {
    public ExcludesArtifactFilter(List<String> patterns) {
        super(patterns);
    }

                .map(Dependency::getArtifact)
                .filter(d -> "org.apache.maven".equals(d.getGroupId()))
                .filter(d -> !DefaultPluginValidationManager.EXPECTED_PROVIDED_SCOPE_EXCLUSIONS_GA.contains(
                        d.getGroupId() + ":" + d.getArtifactId()))
                .map(Artifact::getVersion)
                .filter(v -> v.startsWith("2."))
                .collect(Collectors.toSet());