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189 lines (168 loc) · 6.38 KB
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import javax.script.*;
import java.io.*;
import java.nio.file.*;
import java.util.*;
/**
* This class manages all scripts in the game.
* See:
* http://www.ibm.com/developerworks/java/library/j-5things9/index.html
* http://www.coderanch.com/t/549722/java/java/Calling-Javascript-function-Java-Code
* http://www.mytechnotes.biz/2013/04/calling-javascript-from-java-example.html
* TODO: create a context for each script file or call a method from an object in javascript
* http://docs.oracle.com/javase/7/docs/technotes/guides/scripting/programmer_guide/
* @author Tony Alexander Hild
* @version 0.1a
*/
public final class ScriptManager
{
/**
* We need only one script engine.
*/
private static ScriptEngine engine;
private static Map<String, Long> scriptModifiedStatus = new HashMap<String, Long>();
//private static Bindings bindings;
/**
* Static constructor
*/
static
{
Thread.currentThread().setContextClassLoader(bluej.runtime.ExecServer.getCurrentClassLoader());
engine = new ScriptEngineManager().getEngineByName("javascript");
//Context.setApplicationClassLoader(bluej.runtime.ExecServer.getCurrentClassLoader());
//int flags = DONTENUM | READONLY | PERMANENT;
//ScriptableObject.defineProperty(prc, "Result", new NativeJavaClass(prc, Direction.class), flags);
//engine.put("game", Game.getInstance()); //you can call this façade on script side.
/*
try {
//engine.eval("importPackage(Packages);importPackage(Packages.greenfoot);");
//bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE);
}
catch(ScriptException scrEx)
{
scrEx.printStackTrace();
}
*/
}
private ScriptManager(){}
/**
* Evaluates an entire javascript file. Script files must be of type .js and must be located in "scripts" folder.
*
* @param script the name of .js file without extension.
*/
public static void evalFile(String script) {
try{
String file = "./scripts/" + script + ".js";
if (Files.notExists(Paths.get(file))) return;
FileReader fr = new FileReader(file);
//engine.eval(fr, bindings);
engine.eval(fr);
fr.close();
}
catch(IOException ioEx)
{
ioEx.printStackTrace();
}
catch(ScriptException scrEx)
{
scrEx.printStackTrace();
}
}
/**
* Evaluates a literal script.
*
* @param script the script to be evaluated.
*/
public static void eval(String script) {
try{
//engine.eval(script, bindings);
engine.eval(script);
}
catch(ScriptException scrEx)
{
scrEx.printStackTrace();
}
}
/**
* Invokes a function from a javascript file. Script files must be of type .js and must be located in "scripts" folder.
*
* @param script the name of .js file without extension.
* @param function the function to be called.
* @param args the function arguments.
*/
public static void invokeFunction(String script, String function, Object... args) {
try{
String file = "./scripts/" + script + ".js";
Path filePath = Paths.get(file);
if (Files.notExists(filePath)) return;
long lastModifiedTime = Files.getLastModifiedTime(filePath).toMillis();
if(scriptModifiedStatus.get(script) == null) {
scriptModifiedStatus.put(script, lastModifiedTime);
}
if(lastModifiedTime != scriptModifiedStatus.get(script)) {
FileReader fr = new FileReader(file);
//engine.eval(fr, bindings);
engine.eval(fr);
}
// javax.script.Invocable is an optional interface.
// Check whether your script engine implements or not!
// Note that the JavaScript engine implements Invocable interface.
Invocable inv = (Invocable) engine;
// invoke the global function named "hello"
inv.invokeFunction(function, args);
}
catch(IOException ioEx)
{
ioEx.printStackTrace();
}
catch(ScriptException scrEx)
{
scrEx.printStackTrace();
}
catch (NoSuchMethodException nsmEx)
{
nsmEx.printStackTrace();
}
}
/**
* Invokes a function from a javascript file. Script files must be of type .js and must be located in "scripts" folder.
*
* @param script the name of .js file without extension.
* @param function the function to be called.
* @param args the function arguments.
*/
public static Object invokeMethod(String script, String object, String method, Object... args) {
try{
String file = "./scripts/" + script + ".js";
Path filePath = Paths.get(file);
if (Files.notExists(filePath)) return null;
long lastModifiedTime = Files.getLastModifiedTime(filePath).toMillis();
if(scriptModifiedStatus.get(script) == null || lastModifiedTime != scriptModifiedStatus.get(script)) {
scriptModifiedStatus.put(script, lastModifiedTime);
FileReader fr = new FileReader(file);
engine.eval(fr);
}
// get script object on which we want to implement the interface with
Object obj = engine.get(object);
if(obj == null) return null;
// javax.script.Invocable is an optional interface.
// Check whether your script engine implements or not!
// Note that the JavaScript engine implements Invocable interface.
Invocable inv = (Invocable) engine;
// invoke the global function named "hello"
return inv.invokeMethod(obj, method, args);
}
catch(IOException ioEx)
{
ioEx.printStackTrace();
}
catch(ScriptException scrEx)
{
scrEx.printStackTrace();
}
catch (NoSuchMethodException nsmEx)
{
nsmEx.printStackTrace();
}
return null;
}
}