jdk.nashorn.api.scripting.ScriptObjectMirror Java Examples

public static ScriptValue evalJsFunctionCall(ScriptObjectMirror som, Object callArg, ScenarioContext context) {
    Object result;
    try {
        if (callArg != null) {
            result = som.call(som, callArg);
        } else {
            result = som.call(som);
        }
        return new ScriptValue(result);
    } catch (Exception e) {
        String message = "javascript function call failed: " + e.getMessage();
        context.logger.error(message);
        context.logger.error("failed function body: " + som);
        throw new KarateException(message);
    }
}
 

private List<Integer> getLobbyRange() {
    try {
        if (!ServerConstants.JAVA_8) {
            return convertToIntegerArray((List<Object>)iv.invokeFunction("setLobbyRange", (Object) null));
        } else {  // java 8 support here thanks to MedicOP
            ScriptObjectMirror object = (ScriptObjectMirror) iv.invokeFunction("setLobbyRange", (Object) null);
            int[] to = object.to(int[].class);
            List<Integer> list = new ArrayList<>();
            for (int i : to) {
                list.add(i);
            }
            return list;

        }
    } catch (ScriptException | NoSuchMethodException ex) { // they didn't define a lobby range
        List<Integer> defaultRange = new ArrayList<>();
        defaultRange.add(0);
        defaultRange.add(maxLobbys);
        
        return defaultRange;
    }
}
 

@Test
public void functionalInterfaceObjectTest() throws Exception {
    final ScriptEngineManager manager = new ScriptEngineManager();
    final ScriptEngine e = manager.getEngineByName("nashorn");
    final AtomicBoolean invoked = new AtomicBoolean(false);
    e.put("c", new Consumer<Object>() {
        @Override
        public void accept(Object t) {
            assertTrue(t instanceof ScriptObjectMirror);
            assertEquals(((ScriptObjectMirror)t).get("a"), "xyz");
            invoked.set(true);
        }
    });
    e.eval("var x = 'xy'; x += 'z';c({a:x})");
    assertTrue(invoked.get());
}
 

@SuppressWarnings("unused")
private static Object bindToExpression(final Object fn, final Object receiver) {
    if (fn instanceof ScriptFunction) {
        return bindToExpression((ScriptFunction) fn, receiver);
    } else if (fn instanceof ScriptObjectMirror) {
        final ScriptObjectMirror mirror = (ScriptObjectMirror)fn;
        if (mirror.isFunction()) {
            // We need to make sure correct 'this' is used for calls with Ident call
            // expressions. We do so here using an AbstractJSObject instance.
            return new AbstractJSObject() {
                @Override
                public Object call(final Object thiz, final Object... args) {
                    return mirror.call(withFilterExpression(receiver), args);
                }
            };
        }
    }

    return fn;
}
 

@Test
public void functionalInterfaceObjectTest() throws Exception {
    final ScriptEngineManager manager = new ScriptEngineManager();
    final ScriptEngine e = manager.getEngineByName("nashorn");
    final AtomicBoolean invoked = new AtomicBoolean(false);
    e.put("c", new Consumer<Object>() {
        @Override
        public void accept(Object t) {
            assertTrue(t instanceof ScriptObjectMirror);
            assertEquals(((ScriptObjectMirror)t).get("a"), "xyz");
            invoked.set(true);
        }
    });
    e.eval("var x = 'xy'; x += 'z';c({a:x})");
    assertTrue(invoked.get());
}
 

/**
 * ECMA 15.2.3.2 Object.getPrototypeOf ( O )
 *
 * @param  self self reference
 * @param  obj object to get prototype from
 * @return the prototype of an object
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static Object getPrototypeOf(final Object self, final Object obj) {
    if (obj instanceof ScriptObject) {
        return ((ScriptObject)obj).getProto();
    } else if (obj instanceof ScriptObjectMirror) {
        return ((ScriptObjectMirror)obj).getProto();
    } else {
        final JSType type = JSType.of(obj);
        if (type == JSType.OBJECT) {
            // host (Java) objects have null __proto__
            return null;
        }

        // must be some JS primitive
        throw notAnObject(obj);
    }
}
 

@Test
public void indexPropertiesExternalBufferTest() throws ScriptException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final ScriptObjectMirror obj = (ScriptObjectMirror)e.eval("var obj = {}; obj");
    final ByteBuffer buf = ByteBuffer.allocate(5);
    int i;
    for (i = 0; i < 5; i++) {
        buf.put(i, (byte)(i+10));
    }
    obj.setIndexedPropertiesToExternalArrayData(buf);

    for (i = 0; i < 5; i++) {
        assertEquals((byte)(i+10), ((Number)e.eval("obj[" + i + "]")).byteValue());
    }

    e.eval("for (i = 0; i < 5; i++) obj[i] = 0");
    for (i = 0; i < 5; i++) {
        assertEquals((byte)0, ((Number)e.eval("obj[" + i + "]")).byteValue());
        assertEquals((byte)0, buf.get(i));
    }
}
 

@SuppressWarnings("unused")
private static Object bindToExpression(final Object fn, final Object receiver) {
    if (fn instanceof ScriptFunction) {
        return bindToExpression((ScriptFunction) fn, receiver);
    } else if (fn instanceof ScriptObjectMirror) {
        final ScriptObjectMirror mirror = (ScriptObjectMirror)fn;
        if (mirror.isFunction()) {
            // We need to make sure correct 'this' is used for calls with Ident call
            // expressions. We do so here using an AbstractJSObject instance.
            return new AbstractJSObject() {
                @Override
                public Object call(final Object thiz, final Object... args) {
                    return mirror.call(withFilterExpression(receiver), args);
                }
            };
        }
    }

    return fn;
}
 

/**
 * ECMA 15.2.3.4 Object.getOwnPropertyNames ( O )
 *
 * @param self self reference
 * @param obj  object to query for property names
 * @return array of property names
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static Object getOwnPropertyNames(final Object self, final Object obj) {
    if (obj instanceof ScriptObject) {
        return new NativeArray(((ScriptObject)obj).getOwnKeys(true));
    } else if (obj instanceof ScriptObjectMirror) {
        return new NativeArray(((ScriptObjectMirror)obj).getOwnKeys(true));
    } else {
        throw notAnObject(obj);
    }
}
 

/**
 * ECMA 15.2.3.10 Object.preventExtensions ( O )
 *
 * @param self self reference
 * @param obj  object, for which to set the internal extensible property to false
 * @return object
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static Object preventExtensions(final Object self, final Object obj) {
    if (obj instanceof ScriptObject) {
        return ((ScriptObject)obj).preventExtensions();
    } else if (obj instanceof ScriptObjectMirror) {
        return ((ScriptObjectMirror)obj).preventExtensions();
    } else {
        throw notAnObject(obj);
    }
}
 

/**
 * Factory to create a ListAdapter for a given script object.
 *
 * @param obj script object to wrap as a ListAdapter
 * @return A ListAdapter wrapper object
 */
public static ListAdapter create(final Object obj) {
    if (obj instanceof ScriptObject) {
        final Object mirror = ScriptObjectMirror.wrap(obj, Context.getGlobal());
        return new JSObjectListAdapter((JSObject)mirror);
    } else if (obj instanceof JSObject) {
        return new JSObjectListAdapter((JSObject)obj);
    } else {
        throw new IllegalArgumentException("ScriptObject or JSObject expected");
    }
}
 

/**
 * ECMA 11.4.1 - delete operation, generic implementation
 *
 * @param obj       object with property to delete
 * @param property  property to delete
 * @param strict    are we in strict mode
 *
 * @return true if property was successfully found and deleted
 */
public static boolean DELETE(final Object obj, final Object property, final Object strict) {
    if (obj instanceof ScriptObject) {
        return ((ScriptObject)obj).delete(property, Boolean.TRUE.equals(strict));
    }

    if (obj instanceof Undefined) {
        return ((Undefined)obj).delete(property, false);
    }

    if (obj == null) {
        throw typeError("cant.delete.property", safeToString(property), "null");
    }

    if (obj instanceof ScriptObjectMirror) {
        return ((ScriptObjectMirror)obj).delete(property);
    }

    if (JSType.isPrimitive(obj)) {
        return ((ScriptObject) JSType.toScriptObject(obj)).delete(property, Boolean.TRUE.equals(strict));
    }

    if (obj instanceof JSObject) {
        ((JSObject)obj).removeMember(Objects.toString(property));
        return true;
    }

    // if object is not reference type, vacuously delete is successful.
    return true;
}
 

/**
 * ECMA 15.2.3.13 Object.isExtensible ( O )
 *
 * @param self self reference
 * @param obj check whether an object is extensible
 * @return true if object is extensible, false otherwise
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static boolean isExtensible(final Object self, final Object obj) {
    if (obj instanceof ScriptObject) {
        return ((ScriptObject)obj).isExtensible();
    } else if (obj instanceof ScriptObjectMirror) {
        return ((ScriptObjectMirror)obj).isExtensible();
    } else {
        throw notAnObject(obj);
    }
}
 

/**
 * ECMA 15.2.3.10 Object.preventExtensions ( O )
 *
 * @param self self reference
 * @param obj  object, for which to set the internal extensible property to false
 * @return object
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static Object preventExtensions(final Object self, final Object obj) {
    if (obj instanceof ScriptObject) {
        return ((ScriptObject)obj).preventExtensions();
    } else if (obj instanceof ScriptObjectMirror) {
        return ((ScriptObjectMirror)obj).preventExtensions();
    } else {
        throw notAnObject(obj);
    }
}
 

protected int createActor(Object template, Object name, Object param, Object initCfg) {
	
	HashMap<String,Object> mapParam = new HashMap<>();
	mapParam.put("template", template);
	mapParam.put("fnApi", _jsFnApi);
	if(param != null && !ScriptObjectMirror.isUndefined(param)){
		mapParam.put("param", param);
	}
	ActorProp prop = ActorProp.newProp()
			.classz(DFJsActor.class)
			.param(mapParam);
	if(name != null && name instanceof String){
		prop.name((String) name);
	}
	if(initCfg == null){ //check default cfg
		ScriptObjectMirror mirFunc = (ScriptObjectMirror) template;
		ScriptObjectMirror tmpInstance = (ScriptObjectMirror) mirFunc.newObject();
		initCfg = tmpInstance.getMember("initCfg");
		tmpInstance = null;
	}
	if(initCfg != null){ //has cfg
		try{
			if(!ScriptObjectMirror.isUndefined(initCfg)){
				ScriptObjectMirror mirCfg = (ScriptObjectMirror) initCfg;
				Object objTmp = mirCfg.get("block");
				if(objTmp != null) prop.blockActor((Boolean)objTmp);
				objTmp = mirCfg.get("schedule");
				if(objTmp != null) prop.scheduleMilli((Integer)objTmp);
			}
		}catch(Throwable e){e.printStackTrace();}
	}
	return _mgrActor.createActor(prop.getName(), prop.getClassz(), prop.getParam(),
			(int) (prop.getScheduleMilli()/DFActor.TIMER_UNIT_MILLI), prop.getConsumeType(), prop.isBlock());
}
 

@Test
public void checkMirrorToObject() throws Exception {
    final ScriptEngineManager engineManager = new ScriptEngineManager();
    final ScriptEngine engine = engineManager.getEngineByName("nashorn");
    final Invocable invocable = (Invocable)engine;

    engine.eval("function test1(arg) { return { arg: arg }; }");
    engine.eval("function test2(arg) { return arg; }");
    engine.eval("function compare(arg1, arg2) { return arg1 == arg2; }");

    final Map<String, Object> map = new HashMap<>();
    map.put("option", true);

    final MirrorCheckExample example = invocable.getInterface(MirrorCheckExample.class);

    final Object value1 = invocable.invokeFunction("test1", map);
    final Object value2 = example.test1(map);
    final Object value3 = invocable.invokeFunction("test2", value2);
    final Object value4 = example.test2(value2);

    // check that Object type argument receives a ScriptObjectMirror
    // when ScriptObject is passed
    assertEquals(ScriptObjectMirror.class, value1.getClass());
    assertEquals(ScriptObjectMirror.class, value2.getClass());
    assertEquals(ScriptObjectMirror.class, value3.getClass());
    assertEquals(ScriptObjectMirror.class, value4.getClass());
    assertTrue((boolean)invocable.invokeFunction("compare", value1, value1));
    assertTrue(example.compare(value1, value1));
    assertTrue((boolean)invocable.invokeFunction("compare", value3, value4));
    assertTrue(example.compare(value3, value4));
}
 

public boolean isEach(ScriptObjectMirror som) {
    if (!som.isFunction()) {
        return false;
    }            
    for (String s : values) {
        Object o = som.call(som, s);
        ScriptValue sv = new ScriptValue(o);
        if (!sv.isBooleanTrue()) {
            return false;
        }
    }
    return true;
}
 

public static void main(String[] args) throws ScriptException, IOException {
  ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
  try(Reader reader = Files.newBufferedReader(Paths.get("demo8/funlist.js"))) {
    engine.eval(reader);
  }
  ScriptObjectMirror global = (ScriptObjectMirror)engine.eval("this");
  
  FunListFactory f = bridge(FunListFactory.class, global);
  FunList list = f.cons(1, f.cons(2, f.cons(3, f.nil())));
  
  System.out.println(list.size());
  list.forEach(System.out::println);
}
 

private static JSObject getJSObject(final Object obj, final Global global) {
    if (obj instanceof ScriptObject) {
        return (JSObject)ScriptObjectMirror.wrap(obj, global);
    } else if (obj instanceof JSObject) {
        return (JSObject)obj;
    }
    throw new IllegalArgumentException("ScriptObject or JSObject expected");
}
 

@Test
public void testCanNotConvertArbitraryClassToMirror() {
    assertCanNotConvert(Double.class, Map.class);
    assertCanNotConvert(Double.class, Bindings.class);
    assertCanNotConvert(Double.class, JSObject.class);
    assertCanNotConvert(Double.class, ScriptObjectMirror.class);
}
 

/**
 * ECMA 15.2.3.12 Object.isFrozen ( O )
 *
 * @param self self reference
 * @param obj check whether an object
 * @return true if object is frozen, false otherwise
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static boolean isFrozen(final Object self, final Object obj) {
    if (obj instanceof ScriptObject) {
        return ((ScriptObject)obj).isFrozen();
    } else if (obj instanceof ScriptObjectMirror) {
        return ((ScriptObjectMirror)obj).isFrozen();
    } else {
        throw notAnObject(obj);
    }
}
 

public static boolean isJsArray(Object arr){
	if(arr != null && arr instanceof ScriptObjectMirror){
		ScriptObjectMirror mir = (ScriptObjectMirror) arr;
		boolean b = mir.isArray();
		b = mir.isExtensible();
		
		return mir.isArray();
	}
	return false;
}
 

@SuppressWarnings("unused")
private static Object jsObjectScopeCall(final JSObject jsObj, final Object thiz, final Object[] args) {
    final Object modifiedThiz;
    if (thiz == ScriptRuntime.UNDEFINED && !jsObj.isStrictFunction()) {
        final Global global = Context.getGlobal();
        modifiedThiz = ScriptObjectMirror.wrap(global, global);
    } else {
        modifiedThiz = thiz;
    }
    return jsObj.call(modifiedThiz, args);
}
 

/**
 * ECMA 15.2.3.4 Object.getOwnPropertyNames ( O )
 *
 * @param self self reference
 * @param obj  object to query for property names
 * @return array of property names
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static ScriptObject getOwnPropertyNames(final Object self, final Object obj) {
    if (obj instanceof ScriptObject) {
        return new NativeArray(((ScriptObject)obj).getOwnKeys(true));
    } else if (obj instanceof ScriptObjectMirror) {
        return new NativeArray(((ScriptObjectMirror)obj).getOwnKeys(true));
    } else {
        throw notAnObject(obj);
    }
}
 

public static void showcase(Object... args) {
  Element eShowcase = new Element();
  eShowcase.setName("SHOWCASE");
  for (Object arg : args) {
    log.trace("arg: %s", arg);
    if (((ScriptObjectMirror) arg).isFunction()) {
      ((ScriptObjectMirror) arg).call(arg, eShowcase);
    }
  }
}
 

public void test2(String x, final Object y, final ScriptObject w, final Object... z) {
    test1(x, y, w);

    Assert.assertEquals(z.length, 2);

    Assert.assertTrue(z[0] instanceof ScriptObjectMirror);
    Assert.assertEquals(((ScriptObjectMirror)z[0]).get("baz"), 3);

    Assert.assertTrue(z[1] instanceof ScriptObjectMirror);
    Assert.assertEquals(((ScriptObjectMirror)z[1]).get("bing"), 4);
}
 

/**
 * ECMA 15.2.3.8 Object.seal ( O )
 *
 * @param self self reference
 * @param obj  object to seal
 * @return sealed object
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static Object seal(final Object self, final Object obj) {
    if (obj instanceof ScriptObject) {
        return ((ScriptObject)obj).seal();
    } else if (obj instanceof ScriptObjectMirror) {
        return ((ScriptObjectMirror)obj).seal();
    } else {
        throw notAnObject(obj);
    }
}
 

@Test
public void mirrorNewObjectInstanceFunctionTest() throws ScriptException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final ScriptEngine e2 = m.getEngineByName("nashorn");

    e.eval("function func() {}");
    e2.put("func", e.get("func"));
    final ScriptObjectMirror e2obj = (ScriptObjectMirror)e2.eval("({ foo: func })");
    final Object newObj = ((ScriptObjectMirror)e2obj.getMember("foo")).newObject();
    assertTrue(newObj instanceof ScriptObjectMirror);
}
 

/**
 * ECMA 15.2.3.9 Object.freeze ( O )
 *
 * @param self self reference
 * @param obj object to freeze
 * @return frozen object
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
public static Object freeze(final Object self, final Object obj) {
    if (obj instanceof ScriptObject) {
        return ((ScriptObject)obj).freeze();
    } else if (obj instanceof ScriptObjectMirror) {
        return ((ScriptObjectMirror)obj).freeze();
    } else {
        throw notAnObject(obj);
    }
}
 

/**
 * Entering a {@code with} node requires new scope. This is the implementation. When exiting the with statement,
 * use {@link ScriptObject#getProto()} on the scope.
 *
 * @param scope      existing scope
 * @param expression expression in with
 *
 * @return {@link WithObject} that is the new scope
 */
public static ScriptObject openWith(final ScriptObject scope, final Object expression) {
    final Global global = Context.getGlobal();
    if (expression == UNDEFINED) {
        throw typeError(global, "cant.apply.with.to.undefined");
    } else if (expression == null) {
        throw typeError(global, "cant.apply.with.to.null");
    }

    if (expression instanceof ScriptObjectMirror) {
        final Object unwrapped = ScriptObjectMirror.unwrap(expression, global);
        if (unwrapped instanceof ScriptObject) {
            return new WithObject(scope, (ScriptObject)unwrapped);
        }
        // foreign ScriptObjectMirror
        final ScriptObject exprObj = global.newObject();
        NativeObject.bindAllProperties(exprObj, (ScriptObjectMirror)expression);
        return new WithObject(scope, exprObj);
    }

    final Object wrappedExpr = JSType.toScriptObject(global, expression);
    if (wrappedExpr instanceof ScriptObject) {
        return new WithObject(scope, (ScriptObject)wrappedExpr);
    }

    throw typeError(global, "cant.apply.with.to.non.scriptobject");
}