}

    public String getId() {
        return getSource().getPath();
    }

    public File getSource() {
        return source;
    }

    public File getGenerationDirectory() {
        return generationDirectory;
    }

    public File getImportVocabTokenTypesDirectory() {
        return importVocabTokenTypesDirectory;
    }

                            importVocabGrammarFileMetadata);
                    generationPlan.setImportVocabTokenTypesDirectory(
                            importVocabGrammarGenerationPlan.getGenerationDirectory());
                    if (importVocabGrammarGenerationPlan.isOutOfDate()) {
                        generationPlan.markOutOfDate();

                List<String> generationPlanArguments = Lists.newArrayList(spec.getArguments());
                generationPlanArguments.add("-o");
                generationPlanArguments.add(generationPlan.getGenerationDirectory().getAbsolutePath());
                generationPlanArguments.add(generationPlan.getSource().getAbsolutePath());
                try {
                    invoke(generationPlanArguments, null);