Example usage for jdk.nashorn.api.scripting ScriptObjectMirror delete

Introduction

In this page you can find the example usage for jdk.nashorn.api.scripting ScriptObjectMirror delete.

Prototype

public boolean delete(final Object key) 

Source Link

Document

Delete a property from this object.

Usage

From source file:com.mckoi.webplatform.nashorn.NashornInstanceGlobalFactory.java

License:Open Source License

/**
 * Initializes the NashornInternal object.
 * /*w ww  .  jav  a 2s.c o  m*/
 * @param cl the ClassLoader to use, or null for default.
 */
public void init(final ClassLoader cl) {

    // Incase we call 'init' more than once,
    if (PRIV_nashorn_ctx != null) {
        return;
    }

    // Hacky way to return properties from the Nashorn engine,
    final Object[] inner_data = new Object[5];

    // Run initialization in a privileged security context,
    AccessController.doPrivileged(new PrivilegedAction<Object>() {
        @Override
        public Object run() {

            // We make a VM static NashornScriptEngine that we use to compile
            // scripts and fork new JavaScript instances.

            NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
            NashornScriptEngine engine;
            if (cl == null) {
                engine = (NashornScriptEngine) factory.getScriptEngine(engine_args);
            } else {
                engine = (NashornScriptEngine) factory.getScriptEngine(engine_args, cl);
            }

            // We add some functions to the global object,
            ScriptObjectMirror global_object = (ScriptObjectMirror) engine
                    .getBindings(ScriptContext.ENGINE_SCOPE);

            // A function that performs startup. We execute this to obtain
            // information about the engine such as the Global and Context object.
            // It seems the only way to get at this information is from code
            // running within the engine.
            global_object.put("engineStartup", new EngineStartupFunction(inner_data));

            // Invoke the 'engineStartup' function to get at the priviledged
            // information.
            try {
                engine.invokeFunction("engineStartup", new Object[0]);
            } catch (ScriptException | NoSuchMethodException ex) {
                // Oops,
                throw new RuntimeException(ex);
            } finally {
                // Don't leave this function around, just incase,
                global_object.delete("engineStartup");
            }

            return null;
        }
    });

    PRIV_nashorn_ctx = (Context) inner_data[0];
    //    base_nashorn_global = (Global) inner_data[1];

}

---