}

    protected abstract Interpolator createInterpolator();

    public void initialize() throws InitializationException {
        interpolator = createInterpolator();
        recursionInterceptor = new PrefixAwareRecursionInterceptor(PROJECT_PREFIXES);
    }

    protected final Interpolator getInterpolator() {
        return interpolator;
    }

        Model model = Model.newBuilder().scm(scm).build();

        ModelInterpolator interpolator = createInterpolator();

        final SimpleProblemCollector collector = new SimpleProblemCollector();
        Model out = interpolator.interpolateModel(model, new File("."), createModelBuildingRequest(context), collector);

        assertProblemFree(collector);

        }
    }

    private static Interpolator createInterpolator(MavenExecutionRequest request) {
        StringSearchInterpolator interpolator = new StringSearchInterpolator();
        interpolator.addValueSource(new MapBasedValueSource(request.getUserProperties()));
        interpolator.addValueSource(new MapBasedValueSource(request.getSystemProperties()));
        return interpolator;
    }

        RegexBasedInterpolator interpolator = new RegexBasedInterpolator();

        interpolator.addValueSource(new MapBasedValueSource(request.getSession().getUserProperties()));

        interpolator.addValueSource(new MapBasedValueSource(request.getSession().getSystemProperties()));

        try {
            interpolator.addValueSource(new EnvarBasedValueSource());
        } catch (IOException e) {

            }
        } finally {
            getInterpolator().clearAnswers();
        }
    }

    protected Interpolator createInterpolator() {
        StringSearchInterpolator interpolator = new StringSearchInterpolator();
        interpolator.setCacheAnswers(true);

        return interpolator;
    }

    private static final class InterpolateObjectAction implements PrivilegedAction<ModelInterpolationException> {

        StringSearchInterpolator interpolator = new StringSearchInterpolator();
        interpolator.setCacheAnswers(true);
        for (ValueSource vs : valueSources) {
            interpolator.addValueSource(vs);
        }
        for (InterpolationPostProcessor postProcessor : postProcessors) {
            interpolator.addPostProcessor(postProcessor);
        }