Example usage for javax.script ScriptEngine eval

Introduction

In this page you can find the example usage for javax.script ScriptEngine eval.

Prototype

public Object eval(Reader reader) throws ScriptException;

Source Link

Document

Same as eval(String) except that the source of the script is provided as a Reader

Usage

From source file:Main.java

public static void main(String[] args) {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("js");
    engine.put("a", 1);
    engine.put("b", 5);

    Bindings bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE);
    Object a = bindings.get("a");
    Object b = bindings.get("b");
    System.out.println("a = " + a);
    System.out.println("b = " + b);

    Object result;/*from  w w  w  . ja va2  s . c  om*/
    try {
        result = engine.eval("c = aaaa + bbbb;");
        System.out.println("a + b = " + result);
    } catch (ScriptException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");

    File outputFile = new File("jsoutput.txt");
    System.out.println("Script output will be written to " + outputFile.getAbsolutePath());

    FileWriter writer = new FileWriter(outputFile);
    ScriptContext defaultCtx = engine.getContext();
    defaultCtx.setWriter(writer);/* w  w  w . j  a  va2s  .  c  om*/
    String script = "print('Hello custom output writer')";
    engine.eval(script);
    writer.close();

}

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From source file:MonthlyPayment.java

public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByExtension("js");
    String calcMonthlyPaymentScript = "intrate = intrate/1200.0;"
            + "payment = principal*intrate*(Math.pow (1+intrate, months)/"
            + "                            (Math.pow (1+intrate,months)-1));";

    engine.put("principal", 20000.0);
    System.out.println("Principal = " + engine.get("principal"));
    engine.put("intrate", 6.0);
    System.out.println("Interest Rate = " + engine.get("intrate") + "%");
    engine.put("months", 360);
    System.out.println("Months = " + engine.get("months"));
    engine.eval(calcMonthlyPaymentScript);
    System.out.printf("Monthly Payment = %.2f\n", engine.get("payment"));
}

---

From source file:Main.java

public static void main(String[] args) {
    ScriptEngine engine = new ScriptEngineManager().getEngineByExtension("js");

    String[] ops = { "+", "-", "*", "/" };

    JPanel gui = new JPanel(new BorderLayout(2, 2));
    JPanel labels = new JPanel(new GridLayout(0, 1));
    gui.add(labels, BorderLayout.WEST);
    labels.add(new JLabel("a"));
    labels.add(new JLabel("operand"));
    labels.add(new JLabel("b"));
    labels.add(new JLabel("="));

    JPanel controls = new JPanel(new GridLayout(0, 1));
    gui.add(controls, BorderLayout.CENTER);
    JTextField a = new JTextField(10);
    controls.add(a);/*from www .  j  a  v  a 2s.c o m*/
    JComboBox operand = new JComboBox(ops);
    controls.add(operand);
    JTextField b = new JTextField(10);
    controls.add(b);
    JTextField output = new JTextField(10);
    controls.add(output);

    ActionListener al = new ActionListener() {
        public void actionPerformed(ActionEvent ae) {
            String expression = a.getText() + operand.getSelectedItem() + b.getText();
            try {
                Object result = engine.eval(expression);
                if (result == null) {
                    output.setText("Output was 'null'");
                } else {
                    output.setText(result.toString());
                }
            } catch (ScriptException se) {
                output.setText(se.getMessage());
            }
        }
    };

    operand.addActionListener(al);
    a.addActionListener(al);
    b.addActionListener(al);

    JOptionPane.showMessageDialog(null, gui);
}

---

From source file:velo.scripting.ScriptingManager.java

public static void main(String[] args) throws FactoryException {
    //ScriptingManager sm = new ScriptingManager();
    //ScriptEngine se = sm.getScriptEngine("groovy");
    ScriptEngine se = ScriptingManager.getScriptEngine("groovy");

    OperationContext oc = new OperationContext();
    se.put("name", "moshe");
    se.put("cntx", oc);
    //String a = "<?xml version=\"1.0\"?><j:jelly trim=\"false\" xmlns:j=\"jelly:core\" xmlns:x=\"jelly:xml\" xmlns:html=\"jelly:html\"><html><head><title>${name}'s Page</title></head></html></j:jelly>";
    //String a = "def a = new Date(); println(a.getClass().getName()); def myArr = new Date[1]; myArr[0] = a; println(myArr.getClass().getName()); cntx.addVar('myArr',myArr);";
    String a = "def a = new Date(); a.getClass().getName(); def myArr = new Date[1]; myArr[0] = a; myArr.getClass().getName(); cntx.addVar('myArr',myArr);";

    //Sadly it seems that invoking via se.eval and script.eval almost return the same times, thought it should be much more effecient :/
    try {//w  w w .j av  a  2s .c o m
        //groovy
        //se.eval("println(name);");
        StopWatch sw = new StopWatch();
        sw.start();

        for (int i = 0; i < 100000; i++) {
            se.eval(a);
        }
        sw.stop();
        System.out.println("time in seconds: '" + sw.getTime() / 1000 + "'");
        sw.reset();

        sw.start();
        CompiledScript script = ((Compilable) se).compile(a);
        for (int i = 0; i < 100000; i++) {
            script.eval();
        }
        sw.stop();
        System.out.println("time in seconds: '" + sw.getTime() / 1000 + "'");

        OperationContext getOc = (OperationContext) se.get("cntx");
        Date[] arrOfDate = (Date[]) getOc.get("myArr");
        //System.out.println(arrOfDate);

    } catch (ScriptException e) {
        System.out.println("ERROR: " + e);
    }
}

---

From source file:com.ikanow.aleph2.analytics.spark.assets.SparkJsInterpreterTopology.java

public static void main(String[] args)
        throws InstantiationException, IllegalAccessException, ClassNotFoundException {

    final SetOnce<IBucketLogger> bucket_logger = new SetOnce<>();
    final SetOnce<String> job_name = new SetOnce<>(); // (the string we'll use in logging activities)
    try {/*from ww w  .  jav  a2 s  .  c o  m*/
        final Tuple2<IAnalyticsContext, Optional<ProcessingTestSpecBean>> aleph2_tuple = SparkTechnologyUtils
                .initializeAleph2(args);
        final IAnalyticsContext context = aleph2_tuple._1();
        final Optional<ProcessingTestSpecBean> test_spec = aleph2_tuple._2();

        bucket_logger.set(context.getLogger(context.getBucket()));
        job_name.set(context.getJob().map(j -> j.name()).orElse("no_name"));

        // Optional: make really really sure it exists after the specified timeout
        SparkTechnologyUtils.registerTestTimeout(test_spec, () -> {
            System.exit(0);
        });

        final SparkTopologyConfigBean config = BeanTemplateUtils
                .from(context.getJob().map(job -> job.config()).orElse(Collections.emptyMap()),
                        SparkTopologyConfigBean.class)
                .get();

        final String js_script = Optional.ofNullable(config.script()).orElse("");

        //INFO:
        System.out.println("Starting " + job_name.get());

        SparkConf spark_context = new SparkConf().setAppName(job_name.get());

        test_spec.ifPresent(spec -> System.out
                .println("OPTIONS: test_spec = " + BeanTemplateUtils.toJson(spec).toString()));

        try (final JavaSparkContext jsc = new JavaSparkContext(spark_context)) {

            final Multimap<String, JavaPairRDD<Object, Tuple2<Long, IBatchRecord>>> inputs = SparkTechnologyUtils
                    .buildBatchSparkInputs(context, test_spec, jsc, Collections.emptySet());
            final JavaPairRDD<Object, Tuple2<Long, IBatchRecord>> all_inputs = inputs.values().stream()
                    .reduce((acc1, acc2) -> acc1.union(acc2)).orElse(null);

            // Load globals:
            ScriptEngineManager manager = new ScriptEngineManager();
            ScriptEngine engine = manager.getEngineByName("JavaScript");
            engine.put("_a2_global_context", context);
            engine.put("_a2_global_bucket", context.getBucket().get());
            engine.put("_a2_global_job", context.getJob().get());
            engine.put("_a2_global_config",
                    BeanTemplateUtils.configureMapper(Optional.empty()).convertValue(config, JsonNode.class));
            engine.put("_a2_global_mapper", BeanTemplateUtils.configureMapper(Optional.empty()));
            //TODO (until bucket logger is serializable, don't allow anywhere)
            //engine.put("_a2_bucket_logger", bucket_logger.optional().orElse(null));
            engine.put("_a2_enrichment_name", job_name.get());
            engine.put("_a2_spark_inputs", inputs);
            engine.put("_a2_spark_inputs_all", all_inputs);
            engine.put("_a2_spark_context", jsc);

            Stream.concat(config.uploaded_lang_files().stream(),
                    Stream.of("aleph2_sparkjs_globals_before.js", ""))
                    .flatMap(Lambdas.flatWrap_i(import_path -> {
                        try {
                            if (import_path.equals("")) { // also import the user script just before here
                                return js_script;
                            } else
                                return IOUtils.toString(SparkJsInterpreterTopology.class.getClassLoader()
                                        .getResourceAsStream(import_path), "UTF-8");
                        } catch (Throwable e) {
                            bucket_logger.optional()
                                    .ifPresent(l -> l.log(Level.ERROR,
                                            ErrorUtils.lazyBuildMessage(false,
                                                    () -> SparkJsInterpreterTopology.class.getSimpleName(),
                                                    () -> job_name.get() + ".main", () -> null,
                                                    () -> ErrorUtils.get(
                                                            "Error initializing stage {0} (script {1}): {2}",
                                                            job_name.get(), import_path, e.getMessage()),
                                                    () -> ImmutableMap.<String, Object>of("full_error",
                                                            ErrorUtils.getLongForm("{0}", e)))));

                            System.out.println(ErrorUtils.getLongForm("onStageInitialize: {0}", e));
                            throw e; // ignored
                        }
                    })).forEach(Lambdas.wrap_consumer_i(script -> {
                        try {
                            engine.eval(script);
                        } catch (Throwable e) {
                            bucket_logger.optional()
                                    .ifPresent(l -> l.log(Level.ERROR,
                                            ErrorUtils.lazyBuildMessage(false,
                                                    () -> SparkJsInterpreterTopology.class.getSimpleName(),
                                                    () -> job_name.get() + ".main", () -> null,
                                                    () -> ErrorUtils.get(
                                                            "Error initializing stage {0} (main script): {1}",
                                                            job_name.get(), e.getMessage()),
                                                    () -> ImmutableMap.<String, Object>of("full_error",
                                                            ErrorUtils.getLongForm("{0}", e)))));

                            System.out.println(ErrorUtils.getLongForm("onStageInitialize: {0}", e));
                            throw e; // ignored
                        }
                    }));
            ;

            jsc.stop();

            //INFO:
            System.out.println("Finished " + job_name.get());
        }
    } catch (Throwable t) {
        System.out.println(ErrorUtils.getLongForm("ERROR: {0}", t));

        bucket_logger.optional().ifPresent(l -> l.log(Level.ERROR, ErrorUtils.lazyBuildMessage(false,
                () -> SparkJsInterpreterTopology.class.getSimpleName()
                        + job_name.optional().map(j -> "." + j).orElse(""),
                () -> job_name.optional().orElse("global") + ".main", () -> null,
                () -> ErrorUtils.get("Error on batch in job {0}: {1}",
                        job_name.optional().orElse("global") + ".main", t.getMessage()),
                () -> ImmutableMap.<String, Object>of("full_error", ErrorUtils.getLongForm("{0}", t)))));
    }
}

---

From source file:Main.java

public static Object getValue(String filepath, String key) {
    try {/*from   ww w  .  j a  v a2 s  . c  o m*/
        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine jsEngine = sem.getEngineByName("js");
        jsEngine.eval(new FileReader(filepath));
        return jsEngine.get(key);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return null;
}

---

From source file:Main.java

public static Object invokeFunction(String filepath, String funcname, Object... params) {
    try {/*www. j a  v a 2  s .  c  om*/
        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine jsEngine = sem.getEngineByName("js");
        jsEngine.eval(new FileReader(filepath));
        Invocable invocable = (Invocable) jsEngine;
        return invocable.invokeFunction(funcname, params);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return null;
}

---

From source file:JavaScriptUtils.java

public static void eval(JavaScript script) throws ScriptException {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("js");
    engine.eval(script.value());
}

---

From source file:Main.java

public static String evalScript(String engineName, String script) throws Exception {
    //System.out.println("evaluating "+script);
    ScriptEngineManager mgr = new ScriptEngineManager();
    ScriptEngine engine = mgr.getEngineByName("JavaScript");
    String result = "" + engine.eval(script);
    return result;
}

---

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