* @param request The project building request that holds further parameters, must not be {@code null}.
     * @return The result of the project building, never {@code null}.
     * @throws ProjectBuildingException If the project descriptor could not be successfully built.
     *
     * @see org.apache.maven.model.building.ModelSource2
     */

import org.apache.maven.lifecycle.LifeCyclePluginAnalyzer;
import org.apache.maven.model.building.ModelBuildingRequest;
import org.apache.maven.model.building.ModelProblem.Severity;
import org.apache.maven.model.building.ModelProblem.Version;
import org.apache.maven.model.building.ModelProblemCollector;
import org.apache.maven.model.building.ModelProblemCollectorRequest;
import org.apache.maven.model.merge.MavenModelMerger;

/**

/**
 * Holds data relevant for a model building event.
 *
 */
public interface ModelBuildingEvent {

    /**
     * Gets the model being built. The precise state of this model depends on the event being fired.
     *
     * @return The model being built, never {@code null}.
     */
    Model model();

    Consumer<Model> update();

    /**
     * Gets the model building request being processed.
     *

    List<Profile> getActiveExternalProfiles();

    /**
     * Gets the problems that were encountered during the project building.
     *
     * @return the problems that were encountered during the project building, can be empty but never {@code null}
     */
    @Nonnull
    List<ModelProblem> getProblems();

    /**
     * Creates a human readable representation of these errors.
     */
    String toString();

import org.apache.maven.internal.impl.DefaultLookup;
import org.apache.maven.internal.impl.DefaultSession;
import org.apache.maven.internal.impl.DefaultSessionFactory;
import org.apache.maven.model.building.ModelBuildingException;
import org.apache.maven.model.building.ModelProblem;
import org.codehaus.plexus.PlexusContainer;
import org.codehaus.plexus.testing.PlexusTest;
import org.eclipse.aether.DefaultRepositoryCache;

import org.apache.maven.internal.impl.resolver.DefaultModelRepositoryHolder;
import org.apache.maven.model.building.ArtifactModelSource;
import org.apache.maven.model.building.DefaultModelProblem;
import org.apache.maven.model.building.FileModelSource;
import org.apache.maven.model.building.ModelSource2;
import org.apache.maven.model.building.ModelSource3;
import org.apache.maven.model.resolution.UnresolvableModelException;

/**
 * Replaces expressions of the form <code>${token}</code> with their effective values. Effective values are basically
 * calculated from the elements of the model itself and the execution properties from the building request.
 *
 */
public interface ModelInterpolator {

    /**
     * Interpolates expressions in the specified model. Note that implementations are free to either interpolate the

     *
     * @param model The model whose duplicate elements should be merged, must not be {@code null}.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */

     * file and has not been subjected to inheritance, interpolation or profile/default injection.
     *
     * @param model The model to validate, must not be {@code null}.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */

import org.apache.maven.api.model.Repository;
import org.apache.maven.internal.impl.resolver.ArtifactDescriptorUtils;
import org.apache.maven.model.building.ArtifactModelSource;
import org.apache.maven.model.building.FileModelSource;
import org.apache.maven.model.building.ModelSource;
import org.apache.maven.model.resolution.InvalidRepositoryException;
import org.apache.maven.model.resolution.ModelResolver;