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Nashorn second Attempt (#923) 

* Nashorn

* Nashorn x2

* Nashorn added trailing newlines

* Cleanup

* Formatted script lines

* Change system outs to asserts

* Change Nashorn to be Junit tests

* Remove empty test
This commit is contained in:
Danil Kornishev 2017-01-06 09:20:47 -05:00 committed by Zeger Hendrikse
parent 8f4ef41eb3
commit fbb4065024
9 changed files with 192 additions and 48 deletions
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48
core-java/src/main/java/com/baeldung/scripting/Nashorn.java
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@ -1,48 +0,0 @@
package com.baeldung.scripting;
import javax.script.Bindings;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class Nashorn {
public static void main(String[] args) throws ScriptException, NoSuchMethodException {
ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
Object result = engine.eval(
"var greeting='hello world';" +
"print(greeting);" +
"greeting");
System.out.println(result);
Bindings bindings = engine.createBindings();
bindings.put("count", 3);
bindings.put("name", "baeldung");
String script = "var greeting='Hello ';" +
"for(var i=count;i>0;i--) { " +
"greeting+=name + ' '" +
"}" +
"greeting";
Object bindingsResult = engine.eval(script, bindings);
System.out.println(bindingsResult);
engine.eval("function composeGreeting(name) {" +
"return 'Hello ' + name" +
"}");
Invocable invocable = (Invocable) engine;
Object funcResult = invocable.invokeFunction("composeGreeting", "baeldung");
System.out.println(funcResult);
Object map = engine.eval("var HashMap = Java.type('java.util.HashMap');" +
"var map = new HashMap();" +
"map.put('hello', 'world');" +
"map");
System.out.println(map);
}
}

15
core-java/src/main/resources/js/bind.js Normal file
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@ -0,0 +1,15 @@
var first = {
name: "Whiskey",
age: 5
};
var second = {
volume: 100
};
Object.bindProperties(first, second);
print(first.volume);
second.volume = 1000;
print(first.volume);

1
core-java/src/main/resources/js/locations.js Normal file
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@ -0,0 +1 @@
print(__FILE__, __LINE__, __DIR__);

19
core-java/src/main/resources/js/math_module.js Normal file
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@ -0,0 +1,19 @@
var math = {
increment: function (num) {
return ++num;
},
failFunc: function () {
try {
throw "BOOM";
} catch (e if typeof e === 'string') {
print("String thrown: " + e);
}
catch (e) {
print("this shouldn't happen!");
}
}
};
math;

11
core-java/src/main/resources/js/no_such.js Normal file
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@ -0,0 +1,11 @@
var demo = {
__noSuchProperty__: function (propName) {
print("Accessed non-existing property: " + propName);
},
__noSuchMethod__: function (methodName) {
print("Invoked non-existing method: " + methodName);
}
};
demo;

1
core-java/src/main/resources/js/script.js Normal file
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@ -0,0 +1 @@
function increment(num) ++num;

2
core-java/src/main/resources/js/trim.js Normal file
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@ -0,0 +1,2 @@
print(" hello world".trimLeft());
print("hello world ".trimRight());

9
core-java/src/main/resources/js/typed_arrays.js Normal file
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@ -0,0 +1,9 @@
function arrays(arr) {
var javaIntArray = Java.to(arr, "int[]");
print(javaIntArray[0]);
print(javaIntArray[1]);
print(javaIntArray[2]);
}
arrays([100, "1654", true]);

134
core-java/src/test/java/com/baeldung/scripting/NashornTest.java Normal file
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@ -0,0 +1,134 @@
package com.baeldung.scripting;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import java.io.InputStreamReader;
import java.util.List;
import java.util.Map;
import javax.script.Bindings;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class NashornTest {
private ScriptEngine engine;
@Before
public void setUp() {
engine = new ScriptEngineManager().getEngineByName("nashorn");
}
@Test
public void trim() throws ScriptException {
engine.eval(new InputStreamReader(NashornTest.class.getResourceAsStream("/js/trim.js")));
}
@Test
public void locations() throws ScriptException {
engine.eval(new InputStreamReader(NashornTest.class.getResourceAsStream("/js/locations.js")));
}
@Test
public void bindProperties() throws ScriptException {
engine.eval(new InputStreamReader(NashornTest.class.getResourceAsStream("/js/bind.js")));
}
@Test
public void magicMethods() throws ScriptException {
engine.eval("var demo = load('classpath:js/no_such.js');" +
"var tmp = demo.doesNotExist;" +
"var none = demo.callNonExistingMethod()");
}
@Test
public void typedArrays() throws ScriptException {
engine.eval(new InputStreamReader(NashornTest.class.getResourceAsStream("/js/typed_arrays.js")));
}
@Test
public void basicUsage() throws ScriptException {
Object result = engine.eval("var greeting='hello world';" +
"print(greeting);" +
"greeting");
Assert.assertEquals("hello world", result);
}
@Test
public void jsonObjectExample() throws ScriptException {
Object obj = engine.eval("Java.asJSONCompatible({ number: 42, greet: 'hello', primes: [2,3,5,7,11,13] })");
Map<String, Object> map = (Map<String, Object>) obj;
Assert.assertEquals("hello", map.get("greet"));
Assert.assertTrue(List.class.isAssignableFrom(map.get("primes").getClass()));
}
@Test
public void tryCatchGuard() throws ScriptException {
engine.eval("var math = loadWithNewGlobal('classpath:js/math_module.js');" +
"math.failFunc();");
}
@Test
public void extensionsExamples() throws ScriptException {
String script = "var list = [1, 2, 3, 4, 5];" + "var result = '';" +
"for each (var i in list) {" +
"result+=i+'-';" +
"};" +
"print(result);";
engine.eval(script);
}
@Test
public void bindingsExamples() throws ScriptException {
Bindings bindings = engine.createBindings();
bindings.put("count", 3);
bindings.put("name", "baeldung");
String script = "var greeting='Hello ';" +
"for(var i=count;i>0;i--) { " +
"greeting+=name + ' '" +
"}" +
"greeting";
Object bindingsResult = engine.eval(script, bindings);
Assert.assertEquals("Hello baeldung baeldung baeldung ", bindingsResult);
}
@Test
public void jvmBoundaryExamples() throws ScriptException, NoSuchMethodException {
engine.eval("function composeGreeting(name) {" +
"return 'Hello ' + name" +
"}");
Invocable invocable = (Invocable) engine;
Object funcResult = invocable.invokeFunction("composeGreeting", "baeldung");
Assert.assertEquals("Hello baeldung", funcResult);
Object map = engine.eval("var HashMap = Java.type('java.util.HashMap');" +
"var map = new HashMap();" +
"map.put('hello', 'world');" +
"map");
Assert.assertTrue(Map.class.isAssignableFrom(map.getClass()));
}
@Test
public void loadExamples() throws ScriptException {
Object loadResult = engine.eval("load('classpath:js/script.js');" +
"increment(5)");
Assert.assertEquals(6.0, loadResult);
Object math = engine.eval("var math = loadWithNewGlobal('classpath:js/math_module.js');" +
"math.increment(5);");
Assert.assertEquals(6.0, math);
}
}