JFXActionProvider.java 文件源码

private boolean isJavaScriptAvailable() {
    if(isJSAvailableChecked) {
        return isJSAvailable;
    }
    ScriptEngineManager mgr = new ScriptEngineManager();
    List<ScriptEngineFactory> factories = mgr.getEngineFactories();
    for (ScriptEngineFactory factory: factories) {
        List<String> engNames = factory.getNames();
        for(String name: engNames) {
            if(name.equalsIgnoreCase("js") || name.equalsIgnoreCase("javascript")) { //NOI18N
                isJSAvailableChecked = true;
                isJSAvailable = true;
                return isJSAvailable;
            }
        }
    }
    isJSAvailableChecked = true;
    isJSAvailable = false;
    return isJSAvailable;
}