import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Immutable;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.Nullable;

/**
 *
 * @since 4.0.0
 */
@Experimental
@Immutable
public interface DependencyCoordinate extends ArtifactCoordinate {
    /**
     * The type of the artifact.
     *
     * @return the type
     */
    @Nonnull

import org.eclipse.aether.repository.MirrorSelector;
import org.eclipse.aether.repository.ProxySelector;

/**
 * Strictly internal component able to "extend" session in some way.
 *
 * @since 4.0.0
 */
interface RepositorySystemSessionExtender {
    void extend(
            MavenExecutionRequest mavenExecutionRequest,
            Map<String, Object> configProperties,
            MirrorSelector mirrorSelector,

 * Indicates that the annotated bean has a lifespan limited to a given mojo execution,
 * which means each mojo execution will result in a different instance being injected.
 *
 * TODO: this is currently not implemented
 *
 * @since 4.0.0
 */
@Scope
@Documented
@Retention(RUNTIME)
@Target({TYPE, METHOD})

 *
 * Implementation must have {@code equals()} and {@code hashCode()} implemented, so implementations of this interface
 * can be used as keys.
 *
 * @since 4.0.0
 */
@Experimental
public interface ExtensibleEnum {

    /**
     * The {@code id} uniquely represents a value for this extensible enum.

import java.util.List;
import java.util.stream.Collectors;

import org.apache.maven.api.annotations.Experimental;

/**
 * The Exception class throw by the {@link ToolchainsBuilder}.
 *
 * @since 4.0.0
 */
@Experimental
public class ToolchainsBuilderException extends MavenException {

    private final List<BuilderProblem> problems;

    /**
     * @param message the message to give

 *
 * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
 *
 * @since 3.0
 */
public final class TaskSegment {

    // Can be both "LifeCycleTask" (clean/install) and "GoalTask" (org.mortbay.jetty:maven-jetty-plugin:6.1.19:run)

    private final List<Task> tasks;

 * it delegates to other components that potentially encounter problems. Then, the problem reporter can focus on
 * providing a simple error message, leaving the donkey work of creating a nice model problem to this component.
 *
 */
class DefaultModelProblemCollector implements ModelProblemCollector {

    private final ModelBuilderResult result;

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;

/**
 * Builds the effective toolchains from a user toolchains file and/or a global toolchains file.
 *
 * @since 4.0.0
 */
@Experimental
public interface ToolchainsBuilder extends Service {

    /**
     * Builds the effective toolchains for the specified toolchains files.
     *

     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     * @return The interpolated model, never {@code null}.
     * @since 4.0.0
     */
    Model interpolateModel(Model model, Path projectDir, ModelBuilderRequest request, ModelProblemCollector problems);

     * @param allowStubModel A flag controlling the case of a missing POM artifact. If {@code true} and the specified
     *            POM artifact does not exist, a simple stub model will be returned. If {@code false}, an exception will
     *            be thrown.
     * @param request The project building request that holds further parameters, must not be {@code null}.