ScopeTest.java 文件源码

@Test
public void invokeFunctionInGlobalScopeTest2() throws Exception {
     final ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");

     // create a new ScriptContext instance
     final ScriptContext ctxt = new SimpleScriptContext();
     // set it as 'default' ScriptContext
     engine.setContext(ctxt);

     // create a new Bindings and set as ENGINE_SCOPE
     ctxt.setBindings(engine.createBindings(), ScriptContext.ENGINE_SCOPE);

     // define a function called "func"
     engine.eval("func = function() { return 42 }");

     // move ENGINE_SCOPE Bindings to GLOBAL_SCOPE
     ctxt.setBindings(ctxt.getBindings(ScriptContext.ENGINE_SCOPE), ScriptContext.GLOBAL_SCOPE);

     // create a new Bindings and set as ENGINE_SCOPE
     ctxt.setBindings(engine.createBindings(), ScriptContext.ENGINE_SCOPE);

     // define new function that calls "func" now in GLOBAL_SCOPE
     engine.eval("newfunc = function() { return func() }");

     // call "newfunc" and check the return value
     final Object value = ((Invocable)engine).invokeFunction("newfunc");
     assertTrue(((Number)value).intValue() == 42);
}