Java Utililty Methods Script Engine

List of utility methods to do Script Engine

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Description

The list of methods to do Script Engine are organized into topic(s).

Method

ScriptEngineManagergetScriptEngineManager()
get Script Engine Manager 
if (scriptEngineManager == null) {
    scriptEngineManager = new ScriptEngineManager();
return scriptEngineManager;
StringgetStringOrExcept(ScriptEngine e, String vname)
get String Or Except 
Object r = e.get(vname);
if (r == null || !(r instanceof String)) {
    throw new IllegalArgumentException("No variable named " + vname + " in script engine that is a String");
return (String) r;
StringgetVersionString(ScriptEngineFactory factory)
get Version String 
return factory.getLanguageVersion();
voidimportClass(ScriptEngine e, Class pkg, Bindings... b)
import Class 
try {
    if (b.length == 0) {
        e.eval("importClass(Packages." + pkg.getName() + ")");
    } else {
        e.eval("importClass(Packages." + pkg.getName() + ")", b[0]);
} catch (ScriptException e1) {
    throw new RuntimeException(e1);
...
booleanisJsEngineAvailable(String engineName, Logger logger)
Checks if a JS engine is available 
boolean engineExists = new ScriptEngineManager().getEngineByName(engineName) != null;
if (!engineExists) {
    logger.warn("The JS engine '" + engineName + "' is not available for tests.");
return engineExists;
voidlistGems(ScriptEngine jruby)
Used to print a list of install gems to stdout 
StringBuilder script = new StringBuilder();
script.append("require 'rubygems'\n");
script.append("require 'rubygems/gem_runner'\n");
script.append("Gem::GemRunner.new.run [\"list\"]\n");
jruby.eval(script.toString());
voidlistScriptEngines()
list Script Engines 
ScriptEngineManager mgr = new ScriptEngineManager();
List<ScriptEngineFactory> factories = mgr.getEngineFactories();
int num = 0;
for (ScriptEngineFactory factory : factories) {
    System.out.println("ScriptEngineFactory Info");
    String engName = factory.getEngineName();
    String engVersion = factory.getEngineVersion();
    String langName = factory.getLanguageName();
...
voidregisterFactoryToManager(ScriptEngineFactory factory, ScriptEngineManager scriptEngineManager)
register Factory To Manager 
for (String name : factory.getNames()) {
    scriptEngineManager.registerEngineName(name, factory);
for (String extension : factory.getExtensions()) {
    scriptEngineManager.registerEngineExtension(extension, factory);
for (String mime : factory.getMimeTypes()) {
    scriptEngineManager.registerEngineMimeType(mime, factory);
...
ScriptEngineretrieveEngineByName(ScriptEngineManager scriptEngineManager, String engineName)
Retrieve a ScriptEngine from the given ScriptEngineManager by name, delegating to ScriptEngineManager#getEngineByName but throwing a descriptive exception if not found or if initialization failed. 
ScriptEngine engine = scriptEngineManager.getEngineByName(engineName);
if (engine == null) {
    Set<String> engineNames = new LinkedHashSet<>();
    for (ScriptEngineFactory engineFactory : scriptEngineManager.getEngineFactories()) {
        List<String> factoryNames = engineFactory.getNames();
        if (factoryNames.contains(engineName)) {
            try {
                engine = engineFactory.getScriptEngine();
...
ObjectscriptEngine(String epStr, Map per)
script Engine 
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("js");
for (Iterator iterator = per.keySet().iterator(); iterator.hasNext();) {
    String type = (String) iterator.next();
    engine.put(type, per.get(type));
return engine.eval(epStr);