}
        }
    }

    @Override
    public Collection<? extends Metadata> prepare(Collection<? extends Artifact> artifacts) {
        return Collections.emptyList();
    }

    @Override
    public Artifact transformArtifact(Artifact artifact) {
        return artifact;
    }

    @Override
    public Collection<? extends Metadata> finish(Collection<? extends Artifact> artifacts) {

        return result;
    }

    @Override
    public Collection<ResolutionScope> buildResolutionScopes(InternalScopeManager internalScopeManager) {
        Collection<DependencyScope> allDependencyScopes = internalScopeManager.getDependencyScopeUniverse();
        Collection<DependencyScope> nonTransitiveDependencyScopes =

import org.eclipse.aether.DefaultRepositorySystemSession;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.collection.CollectRequest;
import org.eclipse.aether.collection.CollectResult;
import org.eclipse.aether.collection.DependencyCollectionException;
import org.eclipse.aether.util.graph.manager.DependencyManagerUtils;
import org.eclipse.aether.util.graph.transformer.ConflictResolver;

        return result;
    }

    @Override
    public Collection<org.eclipse.aether.scope.ResolutionScope> buildResolutionScopes(
            InternalScopeManager internalScopeManager) {
        Collection<org.eclipse.aether.scope.DependencyScope> allDependencyScopes =
                internalScopeManager.getDependencyScopeUniverse();
        Collection<org.eclipse.aether.scope.DependencyScope> nonTransitiveDependencyScopes =

public class DefaultTypeProvider implements TypeProvider {
    @SuppressWarnings({"rawtypes", "unchecked"})
    @Override
    public Collection<Type> provides() {
        return (Collection) types();
    }

    public Collection<DefaultType> types() {
        return Arrays.asList(
                // Maven types
                new DefaultType(Type.POM, Language.NONE, "pom", null, false),

        } catch (IllegalArgumentException e) {
            throw new ChecksumAlgorithmServiceException("unsupported algorithm", e);
        }
    }

    @Override
    public Collection<ChecksumAlgorithm> select(Collection<String> algorithmNames) {
        nonNull(algorithmNames, "algorithmNames");
        try {
            return checksumAlgorithmFactorySelector.selectList(new ArrayList<>(algorithmNames)).stream()

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.internal.impl.model;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.aether.artifact.ArtifactTypeRegistry;
import org.eclipse.aether.collection.DependencyGraphTransformer;
import org.eclipse.aether.collection.DependencyManager;
import org.eclipse.aether.collection.DependencySelector;
import org.eclipse.aether.collection.DependencyTraverser;
import org.eclipse.aether.impl.scope.InternalScopeManager;

    List<org.eclipse.aether.graph.Dependency> toDependencies(
            Collection<DependencyCoordinate> dependencies, boolean managed);

    org.eclipse.aether.graph.Dependency toDependency(DependencyCoordinate dependency, boolean managed);

    List<org.eclipse.aether.artifact.Artifact> toArtifacts(Collection<Artifact> artifacts);

    org.eclipse.aether.artifact.Artifact toArtifact(Artifact artifact);

                && Objects.equals(d1.getOptional(), d2.getOptional())
                && 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();