*
 * @since 4.0.0
 */
@Experimental
public interface ProjectBuilderResult {

    /**
     * Gets the identifier of the project that could not be built. The general format of the identifier is {@code
     * <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the exception
     * is thrown so this information is merely meant to assist the user.
     *

        packagingRegistry = emptyPackagingRegistry;
    }

    private static Plugin newPlugin(String artifactId, String... goals) {
        return Plugin.newBuilder()
                .groupId("org.apache.maven.plugins")
                .artifactId(artifactId)
                .executions(Arrays.stream(goals)
                        .map(goal -> PluginExecution.newBuilder()

        packagingRegistry = emptyPackagingRegistry;
    }

    private static Plugin newPlugin(String artifactId, String... goals) {
        return Plugin.newBuilder()
                .groupId("org.apache.maven.plugins")
                .artifactId(artifactId)
                .executions(Arrays.stream(goals)
                        .map(goal -> PluginExecution.newBuilder()

        super(message, cause);
        this.groupId = (groupId != null) ? groupId : "";
        this.artifactId = (artifactId != null) ? artifactId : "";
        this.version = (version != null) ? version : "";
    }

    /**
     * Creates a new exception with specified detail message.
     *
     * @param message The detail message, may be {@code null}.
     * @param groupId The group id of the unresolvable model, may be {@code null}.

    @Override
    public ModelSource resolveModel(
            Session session, String groupId, String artifactId, String version, Consumer<String> resolvedVersion)
            throws ModelResolverException {
        try {
            ArtifactCoordinate coord = session.createArtifactCoordinate(groupId, artifactId, version, "pom");
            if (coord.getVersion().getVersionRange() != null

    void testShouldUseCompileScopeIfDependencyScopeEmpty() throws Exception {
        /*
        String groupId = "org.apache.maven";
        String artifactId = "maven-model";

        Dependency dep = new Dependency();

        dep.setGroupId( groupId );
        dep.setArtifactId( artifactId );
        dep.setVersion( "2.0-alpha-3" );

        Model model = new Model();

    static final class PluginInfo {
        final String groupId;

        private final String artifactId;

        private final String goalPrefix;

        private final String name;

        PluginInfo(String groupId, String artifactId, String goalPrefix, String name) {
            this.groupId = groupId;
            this.artifactId = artifactId;
            this.goalPrefix = goalPrefix;

        GavCacheKey(String groupId, String artifactId, String version, String tag) {
            this(gav(groupId, artifactId, version), tag);
        }

        GavCacheKey(String gav, String tag) {
            this.gav = gav;
            this.tag = tag;
            this.hash = Objects.hash(gav, tag);
        }

        private static String gav(String groupId, String artifactId, String version) {

            ModelBuilderRequest request) {
        // We only check for groupId/artifactId/version/classifier cause if there is another
        // module with the same groupId/artifactId/version/classifier this will fail the build
        // earlier like "Project '...' is duplicated in the reactor.
        // So it is sufficient to check only groupId/artifactId/version/classifier and not the
        // packaging type.

 * identity of a model. The tag allows for further classification of the associated data on the sole discretion of the
 * model builder.
 *
 */
public interface ModelCache {

    <T> T computeIfAbsent(String groupId, String artifactId, String version, String tag, Supplier<T> data);

    <T> T computeIfAbsent(Source path, String tag, Supplier<T> data);