private File getMultiModuleProjectPomFile(MavenExecutionRequest request) {
        File multiModuleProjectDirectory = request.getMultiModuleProjectDirectory();
        if (request.getPom().getParentFile().equals(multiModuleProjectDirectory)) {
            return request.getPom();
        } else {
            File multiModuleProjectPom = modelLocator.locateExistingPom(multiModuleProjectDirectory);
            if (multiModuleProjectPom == null) {

            throws MavenExecutionException {
        if (request.getPom() == null) {
            return projects;
        }

        MavenProject requestPomProject = projects.stream()
                .filter(project -> request.getPom().equals(project.getFile()))
                .findFirst()
                .orElseThrow(() -> new MavenExecutionException(

        }
    }

    private PluginVersionResult resolveFromProject(PluginVersionRequest request) {
        PluginVersionResult result = null;

        if (request.getPom() != null && request.getPom().getBuild() != null) {
            Build build = request.getPom().getBuild();

            result = resolveFromProject(request, build.getPlugins());

            if (result == null && build.getPluginManagement() != null) {

     *         repositories.
     */
    Model getPom();

    /**
     * Sets the POM whose build plugins are to be scanned for the prefix.
     *
     * @param pom The POM whose build plugins are to be scanned for the prefix, may be {@code null} to only search the
     *            plugin repositories.
     * @return This request, never {@code null}.
     */
    PluginPrefixRequest setPom(Model pom);

    /**

                    result.getArtifactId(),
                    request.getPom());
        }

        return result;
    }

    private PluginPrefixResult resolveFromProject(PluginPrefixRequest request) {
        PluginPrefixResult result = null;

        if (request.getPom() != null && request.getPom().getBuild() != null) {
            Build build = request.getPom().getBuild();

        }
    }

    private void baseDirectory(MavenExecutionRequest request) {
        if (request.getBaseDirectory() == null && request.getPom() != null) {
            request.setBaseDirectory(request.getPom().getAbsoluteFile().getParentFile());
        }
    }

    /*if_not[MAVEN4]*/

    @Override
    @Deprecated

    public DefaultPluginVersionRequest setArtifactId(String artifactId) {
        this.artifactId = artifactId;

        return this;
    }

    public Model getPom() {
        return pom;
    }

    public DefaultPluginVersionRequest setPom(Model pom) {
        this.pom = pom;

        return this;
    }

    public List<RemoteRepository> getRepositories() {
        return repositories;
    }

        } else {
            this.pluginGroups = Collections.emptyList();
        }

        return this;
    }

    public Model getPom() {
        return pom;
    }

    public DefaultPluginPrefixRequest setPom(Model pom) {
        this.pom = pom;

        return this;
    }

    public List<RemoteRepository> getRepositories() {
        return repositories;
    }

     *         repositories.
     */
    Model getPom();

    /**
     * Sets the POM whose build plugins are to be scanned for the version.
     *
     * @param pom The POM whose build plugins are to be scanned for the version, may be {@code null} to only search the
     *            plugin repositories.
     * @return This request, never {@code null}.
     */
    PluginVersionRequest setPom(Model pom);

    /**

    }

    @Override
    public List<MavenProject> collectProjects(MavenExecutionRequest request) throws ProjectBuildingException {
        List<File> files = Collections.singletonList(request.getPom().getAbsoluteFile());
        return projectsSelector.selectProjects(files, request);
    }