} else {
            this.pluginGroups = null;
        }

        return this;
    }

    @Override
    public MavenExecutionRequest addPluginGroup(String pluginGroup) {
        if (!getPluginGroups().contains(pluginGroup)) {
            getPluginGroups().add(pluginGroup);
        }

        return this;
    }

    @Override

    MavenExecutionRequest addMirror(Mirror mirror);

    // Plugin groups
    List<String> getPluginGroups();

    MavenExecutionRequest setPluginGroups(List<String> pluginGroups);

    MavenExecutionRequest addPluginGroup(String pluginGroup);

    MavenExecutionRequest addPluginGroups(List<String> pluginGroups);

    boolean isProjectPresent();

    MavenExecutionRequest setProjectPresent(boolean isProjectPresent);

                    context.invokerRequest.rootDirectory().get().toFile());
            request.setRootDirectory(context.invokerRequest.rootDirectory().get());
        }

        request.addPluginGroup("org.apache.maven.plugins");
        request.addPluginGroup("org.codehaus.mojo");
    }

    /**
     * TODO: get rid of this!!!
     */
    @Deprecated