*/
public class MavenExecutionPlan implements Iterable<ExecutionPlanItem> {

    /*
      At the moment, this class is totally immutable, and this is in line with thoughts about the
      pre-calculated execution plan that stays the same during the execution.

      If deciding to add mutable state to this class, it should be at least considered to
      separate this into a separate mutable structure.

    */

            if (plugin.isExtensions() && !artifacts.isEmpty()) {
                // ignore plugin descriptor parsing errors at this point
                // these errors will reported during calculation of project build execution plan
                try {
                    pluginDescriptor = extractPluginDescriptor(artifacts.get(0), plugin);
                } catch (PluginDescriptorParsingException | InvalidPluginDescriptorException e) {

import org.apache.maven.project.MavenProject;

/**
 * Lifecycle mapping delegate component interface. Calculates project build execution plan given {@link Lifecycle} and
 * lifecycle phase. Standard lifecycles use plugin execution {@code <phase>} or mojo default lifecycle phase to
 * calculate the execution plan, but custom lifecycles can use alternative mapping strategies.
 */
@Named(DefaultLifecycleMappingDelegate.HINT)
@Singleton

        int result = 0;
        for (ProjectSegment projectBuild : projectBuildList) {
            MavenExecutionPlan plan = calculateExecutionPlan(
                    projectBuild.getSession(),
                    projectBuild.getProject(),
                    projectBuild.getTaskSegment().getTasks());
            result += plan.size();
        }
        return result;
    }

                forkedExecutions = calculateForkedGoal(mojoExecution, session, forkedProject, alreadyPlannedExecutions);
            }

            // This List can be empty when the executions are already present in the plan
            if (!forkedExecutions.isEmpty()) {
                mojoExecution.setForkedExecutions(BuilderCommon.getKey(forkedProject), forkedExecutions);
            }
        }
    }

        assertEquals("1.0.1", session.getCurrentProject().getVersion());

        MavenExecutionPlan plan = calculateExecutionPlan(session, "clean", "install");

        List<MojoExecution> executions = getExecutions(plan);

        // [01] clean:clean
        // [02] modello:xpp3-writer
        // [03] modello:java
        // [04] modello:xpp3-reader