我如何在 rhino 中定义全局 属性?

How can I define a global property in rhino?

我正在 Java 中嵌入 Rhino,我想创建一个带有 getter 和 setter 的全局 属性。此非全局 属性 定义有效:

var testObj = {};
Object.defineProperty(testObj, 'testPropName', {
  set: function(value) { print('setter called w/' + value); }
});

如果我尝试使用全局 "this" 对象,它会抛出一个错误:

Object.defineProperty(this, 'testPropName', {
  set: function(value) { print('setter called w/' + value); }
});

错误:

TypeError: Expected argument of type object, but instead had type object (#1) in  at line number 1

从 Java 端创建它也可以,但我也没有运气。

Java 方面的解决方案...

public class MyCustomBindings extends SimpleBindings {

@Override
public Object put(String name, Object value) {
  Object result = super.put(name, value);
  // "setter" logic
  return result;
}

@Override
public Object get(Object key) {
  // "getter" logic
  return super.get(key);
}

和其他地方...

ScriptEngineManager factory = new ScriptEngineManager();
engine = factory.getEngineByName("JavaScript");
MyCustomBindings bindings = new MyCustomBindings();
engine.getContext().setBindings(bindings, ScriptContext.ENGINE_SCOPE);