*
     * @return The configuration to unmarshal into the bean or {@code null} if none.
     */
    Object getConfiguration();

    /**
     * Sets the configuration to unmarshal into the bean. The configuration should be taken from
     * {@link org.apache.maven.model.ConfigurationContainer#getConfiguration()} or a similar source.
     * Fully equivalent to {@code setConfiguration(configuration, null)}.
     *

            }
        }
    }

    protected void mergeToolchainModelConfiguration(ToolchainModel target, ToolchainModel source) {
        Xpp3Dom src = (Xpp3Dom) source.getConfiguration();
        if (src != null) {
            Xpp3Dom tgt = (Xpp3Dom) target.getConfiguration();
            if (tgt == null) {
                tgt = Xpp3Dom.mergeXpp3Dom(new Xpp3Dom(src), tgt);
            } else {
                tgt = Xpp3Dom.mergeXpp3Dom(tgt, src);

        for (Plugin plugin : plugins) {
            Xpp3Dom pluginConfiguration = (Xpp3Dom) plugin.getConfiguration();

            if (pluginConfiguration != null) {
                for (PluginExecution execution : plugin.getExecutions()) {
                    Xpp3Dom executionConfiguration = (Xpp3Dom) execution.getConfiguration();

                    executionConfiguration =

                                .configuration(phase.getConfiguration())
                                .executions(phase.getExecutions().stream()
                                        .map(exec -> org.apache.maven.api.model.PluginExecution.newBuilder()
                                                .goals(exec.getGoals())
                                                .configuration(exec.getConfiguration())

        MojoDescriptor mojoDescriptor = mojoExecution.getMojoDescriptor();

        XmlNode executionConfiguration = mojoExecution.getConfiguration() != null
                ? mojoExecution.getConfiguration().getDom()
                : null;
        if (executionConfiguration == null) {
            executionConfiguration = XmlNode.newInstance("configuration");
        }

                break;
            }
        }

        assertNotNull(plugin);

        assertEquals("1.0", plugin.getVersion());

        XmlNode configuration = plugin.getDelegate().getConfiguration();

        assertEquals(
                "src/conf/plexus.conf",
                configuration.child("plexusConfiguration").value());

        assertEquals(
                "src/conf/plexus.properties",

                    if (pluginExecutionId.equals(execution.getId())) {
                        setConfiguration(execution.getConfiguration());
                        break;
                    }
                }
            } else {
                setConfiguration(plugin.getConfiguration());
            }
        }
        return this;
    }

    }

    @Override
    public String getGoal() {
        return delegate.getGoal();
    }

    @Override
    public Optional<XmlNode> getConfiguration() {
        return Optional.of(delegate.getConfiguration()).map(Xpp3Dom::getDom);
    }

    @Override
    public String toString() {
        return delegate.toString();
    }

                Xpp3Dom parentDom = (Xpp3Dom) reportPlugin.getConfiguration();

                if (parentDom != null) {
                    for (ReportSet execution : reportPlugin.getReportSets()) {
                        Xpp3Dom childDom = (Xpp3Dom) execution.getConfiguration();
                        childDom = Xpp3Dom.mergeXpp3Dom(childDom, new Xpp3Dom(parentDom));

    } // -- void addGoal( String )

    /**
     * Get configuration to pass to the goals.
     *
     * @return Object
     */
    public Object getConfiguration() {
        return this.configuration;
    } // -- Object getConfiguration()

    /**
     * Method getGoals.
     *
     * @return List
     */
    public java.util.List<String> getGoals() {
        if (this.goals == null) {