Nashorn scope samples

Author: winterbe

src/com/winterbe/java8/samples/nashorn/Nashorn11.java

@@ -0,0 +1,134 @@
+packagecom.winterbe.java8.samples.nashorn;
+
+importjdk.nashorn.api.scripting.NashornScriptEngine;
+
+importjavax.script.Bindings;
+importjavax.script.ScriptContext;
+importjavax.script.ScriptEngineManager;
+importjavax.script.ScriptException;
+importjavax.script.SimpleBindings;
+importjavax.script.SimpleScriptContext;
+
+/**
+ * @author Benjamin Winterberg
+ */
+publicclassNashorn11{
+
+publicstaticvoidmain(String[] args) throwsException{
+// test1();
+// test2();
+// test3();
+// test4();
+// test5();
+// test6();
+test7();
+ }
+
+privatestaticvoidtest7() throwsScriptException{
+NashornScriptEngineengine = createEngine();
+
+engine.eval("var foo = 23;");
+
+ScriptContextdefaultContext = engine.getContext();
+BindingsdefaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
+
+SimpleScriptContextcontext1 = newSimpleScriptContext();
+context1.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
+
+SimpleScriptContextcontext2 = newSimpleScriptContext();
+context2.getBindings(ScriptContext.ENGINE_SCOPE).put("foo", defaultBindings.get("foo"));
+
+engine.eval("foo = 44;", context1);
+engine.eval("print(foo);", context1);
+engine.eval("print(foo);", context2);
+ }
+
+privatestaticvoidtest6() throwsScriptException{
+NashornScriptEngineengine = createEngine();
+
+ScriptContextdefaultContext = engine.getContext();
+defaultContext.getBindings(ScriptContext.GLOBAL_SCOPE).put("foo", "hello");
+
+ScriptContextcustomContext = newSimpleScriptContext();
+customContext.setBindings(defaultContext.getBindings(ScriptContext.ENGINE_SCOPE), ScriptContext.ENGINE_SCOPE);
+
+Bindingsbindings = newSimpleBindings();
+bindings.put("foo", "world");
+customContext.setBindings(bindings, ScriptContext.GLOBAL_SCOPE);
+
+// engine.eval("foo = 23;"); // overrides foo in all contexts, why???
+
+engine.eval("print(foo)"); // hello
+engine.eval("print(foo)", customContext); // world
+engine.eval("print(foo)", defaultContext); // hello
+ }
+
+privatestaticvoidtest5() throwsScriptException{
+NashornScriptEngineengine = createEngine();
+
+engine.eval("var obj ={foo: 'foo'};");
+engine.eval("function printFoo(){print(obj.foo) };");
+
+ScriptContextdefaultContext = engine.getContext();
+BindingsdefaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
+
+SimpleScriptContextcontext1 = newSimpleScriptContext();
+context1.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
+
+SimpleScriptContextcontext2 = newSimpleScriptContext();
+context2.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
+
+engine.eval("obj.foo = 'bar'", context1);
+engine.eval("printFoo();", context1);
+engine.eval("printFoo();", context2);
+ }
+
+privatestaticvoidtest4() throwsScriptException{
+NashornScriptEngineengine = createEngine();
+
+engine.eval("function foo(){print('bar') };");
+
+ScriptContextdefaultContext = engine.getContext();
+BindingsdefaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
+
+SimpleScriptContextcontext = newSimpleScriptContext();
+context.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
+
+engine.eval("foo();", context);
+System.out.println(context.getAttribute("foo"));
+ }
+
+privatestaticvoidtest3() throwsScriptException{
+NashornScriptEngineengine = createEngine();
+
+ScriptContextdefaultContext = engine.getContext();
+BindingsdefaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
+
+SimpleScriptContextcontext = newSimpleScriptContext();
+context.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
+
+engine.eval("function foo(){print('bar') };", context);
+engine.eval("foo();", context);
+
+Bindingsbindings = context.getBindings(ScriptContext.ENGINE_SCOPE);
+System.out.println(bindings.get("foo"));
+System.out.println(context.getAttribute("foo"));
+ }
+
+privatestaticvoidtest2() throwsScriptException{
+NashornScriptEngineengine = createEngine();
+engine.eval("function foo(){print('bar') };");
+engine.eval("foo();", newSimpleScriptContext());
+ }
+
+privatestaticvoidtest1() throwsScriptException{
+NashornScriptEngineengine = createEngine();
+engine.eval("function foo(){print('bar') };");
+engine.eval("foo();");
+ }
+
+privatestaticNashornScriptEnginecreateEngine(){
+return (NashornScriptEngine) newScriptEngineManager().getEngineByName("nashorn");
+ }
+
+}