Java Invocable.getInterface方法代碼示例

import javax.script.Invocable; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {
    System.out.println("\nTest4\n");
    ScriptEngineManager m = new ScriptEngineManager();
    ScriptEngine e  = Helper.getJsEngine(m);
    if (e == null) {
        System.out.println("Warning: No js engine found; test vacuously passes.");
        return;
    }
    e.eval(new FileReader(
        new File(System.getProperty("test.src", "."), "Test4.js")));
    Invocable inv = (Invocable)e;
    Runnable run1 = (Runnable)inv.getInterface(Runnable.class);
    run1.run();
    // use methods of a specific script object
    Object intfObj = e.get("intfObj");
    Runnable run2 = (Runnable)inv.getInterface(intfObj, Runnable.class);
    run2.run();
}
 

import javax.script.Invocable; //導入方法依賴的package包/類
public static void main(final String[] args) throws Exception {
    final ScriptEngineManager manager = new ScriptEngineManager();
    final ScriptEngine engine = manager.getEngineByName("nashorn");

    // JavaScript code in a String
    final String script = "var obj = new Object(); obj.run = function() { print('run method called'); }";

    // evaluate script
    engine.eval(script);

    // get script object on which we want to implement the interface with
    final Object obj = engine.get("obj");

    final Invocable inv = (Invocable) engine;

    // get Runnable interface object from engine. This interface methods
    // are implemented by script methods of object 'obj'
    final Runnable r = inv.getInterface(obj, Runnable.class);

    // start a new thread that runs the script implemented
    // runnable interface
    final Thread th = new Thread(r);
    th.start();
    th.join();
}
 

import javax.script.Invocable; //導入方法依賴的package包/類
public static void main(final String[] args) throws Exception {
    final ScriptEngineManager manager = new ScriptEngineManager();
    final ScriptEngine engine = manager.getEngineByName("nashorn");

    // JavaScript code in a String
    final String script = "function run() { print('run called'); }";

    // evaluate script
    engine.eval(script);

    final Invocable inv = (Invocable) engine;

    // get Runnable interface object from engine. This interface methods
    // are implemented by script functions with the matching name.
    final Runnable r = inv.getInterface(Runnable.class);

    // start a new thread that runs the script implemented
    // runnable interface
    final Thread th = new Thread(r);
    th.start();
    th.join();
}
 

import javax.script.Invocable; //導入方法依賴的package包/類
@Test
public void defaultMethodTest() throws ScriptException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Invocable inv = (Invocable) e;

    final Object obj = e.eval("({ apply: function(arg) { return arg.toUpperCase(); }})");
    @SuppressWarnings("unchecked")
    final Function<String, String> func = inv.getInterface(obj, Function.class);
    assertEquals(func.apply("hello"), "HELLO");
}
 

import javax.script.Invocable; //導入方法依賴的package包/類
@Test
public void checkMirrorToObject() throws Exception {
    final ScriptEngineManager engineManager = new ScriptEngineManager();
    final ScriptEngine engine = engineManager.getEngineByName("nashorn");
    final Invocable invocable = (Invocable)engine;

    engine.eval("function test1(arg) { return { arg: arg }; }");
    engine.eval("function test2(arg) { return arg; }");
    engine.eval("function compare(arg1, arg2) { return arg1 == arg2; }");

    final Map<String, Object> map = new HashMap<>();
    map.put("option", true);

    final MirrorCheckExample example = invocable.getInterface(MirrorCheckExample.class);

    final Object value1 = invocable.invokeFunction("test1", map);
    final Object value2 = example.test1(map);
    final Object value3 = invocable.invokeFunction("test2", value2);
    final Object value4 = example.test2(value2);

    // check that Object type argument receives a ScriptObjectMirror
    // when ScriptObject is passed
    assertEquals(ScriptObjectMirror.class, value1.getClass());
    assertEquals(ScriptObjectMirror.class, value2.getClass());
    assertEquals(ScriptObjectMirror.class, value3.getClass());
    assertEquals(ScriptObjectMirror.class, value4.getClass());
    assertTrue((boolean)invocable.invokeFunction("compare", value1, value1));
    assertTrue(example.compare(value1, value1));
    assertTrue((boolean)invocable.invokeFunction("compare", value3, value4));
    assertTrue(example.compare(value3, value4));
}
 

import javax.script.Invocable; //導入方法依賴的package包/類
@Test
public void mirrorUnwrapInterfaceMethod() throws Exception {
    final ScriptEngineManager engineManager = new ScriptEngineManager();
    final ScriptEngine engine = engineManager.getEngineByName("nashorn");
    final Invocable invocable = (Invocable)engine;
    engine.eval("function apply(obj) { " +
        " return obj instanceof Packages.jdk.nashorn.api.scripting.ScriptObjectMirror; " +
        "}");
    @SuppressWarnings("unchecked")
    final Function<Object,Object> func = invocable.getInterface(Function.class);
    assertFalse((boolean)func.apply(engine.eval("({ x: 2 })")));
}