gistfile1.txt

  public JavascriptEnforcer(DateSource dateSource, RulesCurator rulesCurator,
        PreEntHelper preHelper, PostEntHelper postHelper,
        ProductServiceAdapter prodAdapter) {
        this(dateSource, new StringReader(rulesCurator.getRules().getRules()),
            preHelper, postHelper, prodAdapter, new ScriptEngineManager()
                .getEngineByName("JavaScript"));
    }

    @Inject
    public JavascriptEnforcer(DateSource dateSource, Reader rulesReader,
        PreEntHelper preHelper, PostEntHelper postHelper,
        ProductServiceAdapter prodAdapter, ScriptEngine jsEngine) {
        this.dateSource = dateSource;
        this.preHelper = preHelper;
        this.postHelper = postHelper;
        this.prodAdapter = prodAdapter;
        this.jsEngine = jsEngine;
        
        if (jsEngine == null) {
            throw new RuntimeException("No Javascript engine");
        }

        try {
            this.jsEngine.eval(rulesReader);
        }
        catch (ScriptException ex) {
            throw new RuleParseException(ex);
        }
    }