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

        return this;
    }

    @Override
    public Model getPom() {
        return pom;
    }

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

        return this;
    }

    @Override
    public List<RemoteRepository> getRepositories() {

        this.artifactId = artifactId;

        return this;
    }

    @Override
    public Model getPom() {
        return pom;
    }

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

        return this;
    }

    @Override
    public List<RemoteRepository> getRepositories() {

     *         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);

    /**

        return useReactor;
    }

    /** @deprecated use {@link #setPom(File)} */
    @Deprecated
    public MavenExecutionRequest setPomFile(String pomFilename) {
        if (pomFilename != null) {
            pom = new File(pomFilename);
        }

        return this;
    }

    @Override
    public MavenExecutionRequest setPom(File pom) {
        this.pom = pom;

        return this;
    }

     *         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);

    /**

        MavenExecutionRequest request = new DefaultMavenExecutionRequest()
                .setRootDirectory(pom != null ? pom.toPath().getParent() : null)
                .setPom(pom)
                .setProjectPresent(true)
                .setShowErrors(true)
                .setPluginGroups(Arrays.asList("org.apache.maven.plugins"))
                .setLocalRepository(getLocalRepository())

    @Override
    public Plugin getPluginDefinitionForPrefix(String prefix, MavenSession session, MavenProject project) {
        PluginPrefixRequest request = new DefaultPluginPrefixRequest(prefix, session);
        request.setPom(project.getModel());

        try {
            PluginPrefixResult result = pluginPrefixResolver.resolve(request);

            Plugin plugin = new Plugin();
            plugin.setGroupId(result.getGroupId());

    }

    protected MavenExecutionRequest createMavenExecutionRequest(File pom) throws Exception {
        MavenExecutionRequest request = new DefaultMavenExecutionRequest()
                .setPom(pom)
                .setProjectPresent(true)
                .setShowErrors(true)
                .setPluginGroups(Arrays.asList("org.apache.maven.plugins"))
                .setLocalRepository(getLocalRepository())

    // Recursive (really to just process the top-level POM)
    MavenExecutionRequest setRecursive(boolean recursive);

    boolean isRecursive();

    MavenExecutionRequest setPom(File pom);

    File getPom();

    // Errors
    MavenExecutionRequest setShowErrors(boolean showErrors);

    boolean isShowErrors();

    // Transfer listeners

        request.setGlobalChecksumPolicy(determineGlobalChecksumPolicy(context));

        Path pom = determinePom(context, lookup);
        if (pom != null) {
            request.setPom(pom.toFile());
            if (pom.getParent() != null) {
                request.setBaseDirectory(pom.getParent().toFile());
            }