return Holder.deref(modelByGA.get(new GAKey(groupId, artifactId)));
    }

    @Override
    public Path locate(Path path) {
        return modelLocator.locateExistingPom(path);
    }

    static class GAKey {
        private final String groupId;
        private final String artifactId;
        private final int hashCode;

        GAKey(String groupId, String artifactId) {

    @Deprecated // This appears only to be used in test code
    public String getModulePathAdjustment(MavenProject moduleProject) throws IOException {
        // FIXME: This is hacky. What if module directory doesn't match artifactid, and parent
        // is coming from the repository??
        String module = moduleProject.getArtifactId();

        File moduleFile = moduleProject.getFile();

import org.apache.maven.api.services.ModelTransformerContext;
import org.apache.maven.api.services.ModelTransformerContextBuilder;
import org.apache.maven.internal.impl.model.DefaultModelTransformerContext.GAKey;
import org.apache.maven.internal.impl.model.DefaultModelTransformerContext.Holder;

/**
 * Builds up the transformer context.

import org.apache.maven.api.services.Source;
import org.eclipse.aether.RepositoryCache;
import org.eclipse.aether.RepositorySystemSession;

import static java.util.Objects.requireNonNull;

/**
 * A model builder cache backed by the repository system cache.
 *
 */
public class DefaultModelCache implements ModelCache {
    private static final String KEY = DefaultModelCache.class.getName();

    @SuppressWarnings("unchecked")

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (!(obj instanceof GAKey)) {
                return false;
            }
            GAKey that = (GAKey) obj;
            return artifactId.equals(that.artifactId) && groupId.equals(that.groupId);
        }

        @Override
        public int hashCode() {

 */
@Experimental
public interface Source {

    /**
     * Provides access the file to be parsed, if this source is backed by a file.
     *
     * @return the underlying {@code Path}, or {@code null} if this source is not backed by a file
     */
    @Nullable
    Path getPath();

    /**
     * Creates a new byte stream to the source contents.

import static org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.Matchers.empty;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.hasKey;
import static org.hamcrest.Matchers.is;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;

            info.repository = repository;
            info.timestamp = timestamp;
        }
    }

    private void merge(Map<String, VersionInfo> infos, String srcKey, String dstKey) {
        VersionInfo srcInfo = infos.get(srcKey);
        VersionInfo dstInfo = infos.get(dstKey);

        if (dstInfo == null
                || (srcInfo != null
                        && dstInfo.isOutdated(srcInfo.timestamp)

    /**
     * Creates a new source backed by the specified file.
     *
     * @param file The file, must not be {@code null}.
     * @deprecated Use {@link #FileSource(Path)} instead.
     */
    @Deprecated
    public FileSource(File file) {
        this(Objects.requireNonNull(file, "file cannot be null").toPath());
    }

    /**
     * Creates a new source backed by the specified file.
     *

/**
 * Wraps an ordinary {@link URL} as a source.
 *
 */
public class UrlSource implements Source {

    private final URL url;

    private final int hashCode;

    /**
     * Creates a new source backed by the specified URL.
     *
     * @param url The file, must not be {@code null}.
     */
    public UrlSource(URL url) {
        this.url = Objects.requireNonNull(url, "url cannot be null");