*/
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.

    */

    }

    /**
     * Returns {@code true} if passed in artifact is originating from local repository. In other words, we want
     * to process and store tracking information ONLY into local repository, not to any other place. This method
     * filters out currently built artifacts, as events are fired for them as well, but their resolved artifact
     * file would point to checked out source-tree, not the local repository.
     * <p>

         * Finally, return the result of the last expression part's resolution.</p>
         *
         * <p><b>NOTE:</b> The object-graph nagivation actually takes place via the
         * {@link ReflectionValueExtractor} class.</p>
         */
        public Object getValue(String expression) {
            if (expression == null || expression.trim().isEmpty()) {

            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) {

        }
        return info;
    }

    /**
     * Returns {@link JavaPathType#MODULES} if the given JAR file or output directory is modular.
     * This is used in heuristic rules for deciding whether to place a dependency on the class-path
     * or on the module-path when the {@code "jar"} artifact type is used.
     */
    private PathType getPathType(Path path) throws IOException {
        PathType type = pathTypes.get(path);

        }
        msg += ")";
        logger.debug(msg);
    }

    public void manageArtifactVersion(Artifact artifact, Artifact replacement) {
        // only show msg if a change is actually taking place
        if (!replacement.getVersion().equals(artifact.getVersion())) {
            String msg = indent + artifact + " (applying version: " + replacement.getVersion() + ")";
            logger.debug(msg);
        }
    }

    /**
     * Artifact type name for a JAR file to unconditionally place on the class-path.
     * If the JAR is modular, its module information are ignored.
     * This type is new in Maven 4.
     */
    String CLASSPATH_JAR = "classpath-jar";

    /**
     * Artifact type name for a JAR file to unconditionally place on the module-path.
     * If the JAR is not modular, then it is loaded by Java as an unnamed module.

        MavenExecutionPlan plan = LifecycleExecutionPlanCalculatorStub.getProjectAExecutionPlan();
        final Set<Plugin> unSafePlugins = plan.getNonThreadSafePlugins();
        // There is only a single threadsafe plugin here...
        assertEquals(plan.size() - 1, unSafePlugins.size());
    }

    @Test
    void testFindLastWhenFirst() throws Exception {

 * lifecycle at all, in which case we wouldn't be needing this class at all ( and
 * ProjectBuildList.getByTaskSegments). Or maybe they should be introduced in the calculation
 * of the execution plan instead, which seems much nicer.
 * </p>
 * <p>
 * Additionally this class contains a clone of the MavenSession, which is *only* needed
 * because it has as notion of a "current" project.
 * </p>

        }
        return info;
    }

    /**
     * Returns {@link JavaPathType#MODULES} if the given JAR file or output directory is modular.
     * This is used in heuristic rules for deciding whether to place a dependency on the class-path
     * or on the module-path when the {@code "jar"} artifact type is used.
     */
    private PathType getPathType(Path path) throws IOException {
        PathType type = pathTypes.get(path);