List<TaskSegment> calculateTaskSegments(MavenSession session, List<String> tasks)
            throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
                    MojoNotFoundException, NoPluginFoundForPrefixException, InvalidPluginDescriptorException,
                    PluginVersionResolutionException;

    boolean requiresProject(MavenSession session);

    // separate.
    protected MavenSession createMavenSession(File pom) throws Exception {
        return createMavenSession(pom, new Properties());
    }

    protected MavenSession createMavenSession(File pom, Properties executionProperties) throws Exception {
        return createMavenSession(pom, executionProperties, false);
    }

import org.apache.maven.execution.ExecutionEvent.Type;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.lifecycle.internal.ExecutionEventCatapult;
import org.apache.maven.plugin.MojoExecution;

/**
 */
public class ExecutionEventCatapultStub implements ExecutionEventCatapult {

    @Override
    public void fire(Type eventType, MavenSession session, MojoExecution mojoExecution) {}

    @Override

import org.apache.maven.artifact.resolver.ResolutionErrorHandler;
import org.apache.maven.artifact.resolver.filter.CumulativeScopeArtifactFilter;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.artifact.ProjectArtifact;
import org.apache.maven.repository.RepositorySystem;

/**

public class ProjectExecutionEvent {

    private final MavenSession session;

    private final MavenProject project;

    private final List<MojoExecution> executionPlan;

    private final Throwable cause;

    public ProjectExecutionEvent(MavenSession session, MavenProject project) {
        this(session, project, null, null);
    }

import org.apache.maven.execution.ExecutionEvent;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.plugin.MojoExecution;
import org.apache.maven.project.MavenProject;

/**
 * Holds data relevant for an execution event.
 *
 */
class DefaultExecutionEvent implements ExecutionEvent {

    private final Type type;

    private final MavenSession session;

    private final MojoExecution mojoExecution;

                + DEPRECATED_CORE_PARAMETERS.get(parameter.getDefaultValue());
    }

    @Override
    protected void doValidate(
            MavenSession mavenSession,
            MojoDescriptor mojoDescriptor,
            Class<?> mojoClass,
            PlexusConfiguration pomConfiguration,
            ExpressionEvaluator expressionEvaluator) {

            }
        }

        return taskSegments;
    }

    private boolean projectIsNotPresent(MavenSession session) {
        return !session.getRequest().isProjectPresent();
    }

    private boolean requiresProject(MavenSession session) {
        List<String> goals = session.getGoals();
        if (goals != null) {
            for (String goal : goals) {

    // separate.
    protected MavenSession createMavenSession(File pom) throws Exception {
        return createMavenSession(pom, new Properties());
    }

    protected MavenSession createMavenSession(File pom, Properties executionProperties) throws Exception {
        return createMavenSession(pom, executionProperties, false);
    }

 *
 */
public interface MavenPluginConfigurationValidator {
    /**
     * Checks mojo configuration issues.
     */
    void validate(
            MavenSession mavenSession,
            MojoDescriptor mojoDescriptor,
            Class<?> mojoClass,
            PlexusConfiguration pomConfiguration,
            ExpressionEvaluator expressionEvaluator);