Hi,
in my code, I get hold of a function object from some 3rd party Javascript
code, and I need to execute that function within a new context, i.e. make new
ENGINE_SCOPE bindings available to it. ScriptObjectMirror.call() unfortunately
does not allow to define a context to execute in, so I tried to workaround by
calling the function from a CompiledScript that in turn can be executed with a
custom context:
@Test
public void testJsFunctionWithContext() throws ScriptException {
ScriptEngine engine = new
ScriptEngineManager().getEngineByName("JavaScript");
jdk.nashorn.api.scripting.ScriptObjectMirror jsFunction =
(ScriptObjectMirror) engine.eval("function test() {return foo;}");
ScriptContext context = new SimpleScriptContext();
context.setAttribute("foo", "bar", ScriptContext.ENGINE_SCOPE);
context.setAttribute("fn", jsFunction, ScriptContext.ENGINE_SCOPE);
// does work: access context directly
CompiledScript contextWrapper = ((Compilable) engine).compile("foo");
String result = (String) contextWrapper.eval(context);
assertEquals("bar", result);
// does not work: access context from within function ("foo" is not
defined)
contextWrapper = ((Compilable) engine).compile("fn()");
result = (String) contextWrapper.eval(context);
assertEquals("bar", result);
}
Is there some mistake I made here, or is it simply not possible for a function
object to access variables from a new context?
If that’s really not possible, is there maybe a way of turning a function
object into a CompiledScript object, which can then be evaluated with a new
context?
Thanks for any help,
Jörg
---
Dipl. Inf. Jörg von Frantzius, Technical Director
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