import java.nio.file.Path;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;

import org.apache.maven.api.metadata.Metadata;
import org.apache.maven.api.metadata.Plugin;

/**
 * Maven G level metadata.
 */
final class PluginsMetadata extends MavenMetadata {
    static final class PluginInfo {
        final String groupId;

        private final String artifactId;

import org.apache.maven.api.metadata.Metadata;
import org.apache.maven.api.metadata.Versioning;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.artifact.ArtifactProperties;

/**
 * Maven GA level metadata.
 */
final class VersionsMetadata extends MavenMetadata {

    private final Artifact artifact;

    VersionsMetadata(Artifact artifact, Date timestamp) {

            throws ModelBuilderException {
        Model model;
        problems.setSource(modelSource.getLocation());
        try {
            boolean strict = request.getValidationLevel() >= ModelBuilderRequest.VALIDATION_LEVEL_MAVEN_2_0;

            try (InputStream is = modelSource.openStream()) {
                model = modelProcessor.read(XmlReaderRequest.builder()
                        .strict(strict)

-->

<!--
  | Improvements:
  |
  | o add specification element to a field, this would be more a technical description of
  |   what is allowed in the field.
  |
  | o validators: there could be several levels of validation. Simple type validation could
  |   be done with a regex, but we need inter-field validation and rules which could be
  |   dealt with by something like drools.
  |

     * users to migrate their projects.
     */
    int VALIDATION_LEVEL_MAVEN_2_0 = 20;

    /**
     * Denotes validation as performed by Maven 3.0. This validation level is meant for existing projects.
     */
    int VALIDATION_LEVEL_MAVEN_3_0 = 30;

    /**
     * Denotes validation as performed by Maven 3.1. This validation level is meant for existing projects.

        request.projectBuild(true);
        request.session(InternalSession.from(session));
        request.source(ModelSource.fromPath(src));
        request.validationLevel(ModelBuilderRequest.VALIDATION_LEVEL_MINIMAL);
        request.locationTracking(false);
        request.modelResolver(modelResolver);
        request.transformerContextBuilder(modelBuilder.newTransformerContextBuilder());

        createLocalArtifact("h", "1.0");
        artifactResolver.resolveTransitively(
                Collections.singleton(g), projectArtifact, remoteRepositories(), localRepository(), null);

        // we want to see all top-level thread groups
        ThreadGroup tg = Thread.currentThread().getThreadGroup();
        while (tg.getParent() == null) {
            tg = tg.getParent();
        }

import org.apache.maven.api.metadata.Snapshot;
import org.apache.maven.api.metadata.SnapshotVersion;
import org.apache.maven.api.metadata.Versioning;
import org.eclipse.aether.artifact.Artifact;

/**
 * Maven remote GAV level metadata.
 */
final class RemoteSnapshotMetadata extends MavenSnapshotMetadata {
    public static final String DEFAULT_SNAPSHOT_TIMESTAMP_FORMAT = "yyyyMMdd.HHmmss";