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

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package com.winterbe.java8.samples.nashorn;
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import jdk.nashorn.api.scripting.NashornScriptEngine;
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import javax.script.Bindings;
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import javax.script.ScriptContext;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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import javax.script.SimpleBindings;
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import javax.script.SimpleScriptContext;
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/**
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* @author Benjamin Winterberg
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*/
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public class Nashorn11 {
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public static void main(String[] args) throws Exception {
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// test1();
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// test2();
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// test3();
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// test4();
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// test5();
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// test6();
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test7();
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}
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private static void test7() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("var foo = 23;");
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ScriptContext defaultContext = engine.getContext();
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Bindings defaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context1 = new SimpleScriptContext();
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context1.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context2 = new SimpleScriptContext();
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context2.getBindings(ScriptContext.ENGINE_SCOPE).put("foo", defaultBindings.get("foo"));
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engine.eval("foo = 44;", context1);
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engine.eval("print(foo);", context1);
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engine.eval("print(foo);", context2);
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}
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private static void test6() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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ScriptContext defaultContext = engine.getContext();
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defaultContext.getBindings(ScriptContext.GLOBAL_SCOPE).put("foo", "hello");
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ScriptContext customContext = new SimpleScriptContext();
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customContext.setBindings(defaultContext.getBindings(ScriptContext.ENGINE_SCOPE), ScriptContext.ENGINE_SCOPE);
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Bindings bindings = new SimpleBindings();
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bindings.put("foo", "world");
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customContext.setBindings(bindings, ScriptContext.GLOBAL_SCOPE);
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// engine.eval("foo = 23;"); // overrides foo in all contexts, why???
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engine.eval("print(foo)"); // hello
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engine.eval("print(foo)", customContext); // world
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engine.eval("print(foo)", defaultContext); // hello
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}
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private static void test5() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("var obj = { foo: 'foo' };");
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engine.eval("function printFoo() { print(obj.foo) };");
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ScriptContext defaultContext = engine.getContext();
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Bindings defaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context1 = new SimpleScriptContext();
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context1.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context2 = new SimpleScriptContext();
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context2.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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engine.eval("obj.foo = 'bar';", context1);
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engine.eval("printFoo();", context1);
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engine.eval("printFoo();", context2);
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}
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private static void test4() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("function foo() { print('bar') };");
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ScriptContext defaultContext = engine.getContext();
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Bindings defaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context = new SimpleScriptContext();
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context.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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engine.eval("foo();", context);
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System.out.println(context.getAttribute("foo"));
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}
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private static void test3() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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ScriptContext defaultContext = engine.getContext();
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Bindings defaultBindings = defaultContext.getBindings(ScriptContext.ENGINE_SCOPE);
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SimpleScriptContext context = new SimpleScriptContext();
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context.setBindings(defaultBindings, ScriptContext.ENGINE_SCOPE);
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engine.eval("function foo() { print('bar') };", context);
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engine.eval("foo();", context);
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Bindings bindings = context.getBindings(ScriptContext.ENGINE_SCOPE);
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System.out.println(bindings.get("foo"));
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System.out.println(context.getAttribute("foo"));
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}
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private static void test2() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("function foo() { print('bar') };");
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engine.eval("foo();", new SimpleScriptContext());
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}
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private static void test1() throws ScriptException {
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NashornScriptEngine engine = createEngine();
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engine.eval("function foo() { print('bar') };");
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engine.eval("foo();");
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}
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private static NashornScriptEngine createEngine() {
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return (NashornScriptEngine) new ScriptEngineManager().getEngineByName("nashorn");
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}
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}

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