this.outputDirectory = outputDirectory;
        this.maxHeapSize = maxHeapSize;
    }

    public List<String> getArguments() {
        return arguments;
    }

    public Set<File> getGrammarFiles() {
        return grammarFiles;
    }

    public String getMaxHeapSize() {
        return maxHeapSize;
    }

    public File getOutputDirectory() {
        return outputDirectory;
    }

                    arguments.add("-o");
                    arguments.add(spec.getOutputDirectory().getAbsolutePath());
                    for (File grammarFile : spec.getGrammarFiles()) {
                        String relativeGrammarFilePath = RelativePathUtil.relativePath(inputDirectory, grammarFile);
                        if (onWindows) {