/**
* Invoke a script from the command line.
*
* @param scriptResource the script resource of path
* @param scriptArgs an array of command line arguments
* @return the return value
* @throws IOException an I/O related error occurred
* @throws JavaScriptException the script threw an error during compilation or execution
*/
public Object runScript(Object scriptResource, String... scriptArgs)
throws IOException, JavaScriptException {
Resource resource;
if (scriptResource instanceof Resource) {
resource = (Resource) scriptResource;
} else if (scriptResource instanceof String) {
resource = findResource((String) scriptResource, null, null);
} else {
throw new IOException("Unsupported script resource: " + scriptResource);
}
if (!resource.exists()) {
throw new FileNotFoundException(scriptResource.toString());
}
Context cx = contextFactory.enterContext();
try {
Object retval;
Map<Trackable, ReloadableScript> scripts = getScriptCache(cx);
commandLineArgs = Arrays.asList(scriptArgs);
ReloadableScript script = new ReloadableScript(resource, this);
scripts.put(resource, script);
mainScope = new ModuleScope(resource.getModuleName(), resource, globalScope, mainWorker);
retval = mainWorker.evaluateScript(cx, script, mainScope);
mainScope.updateExports();
return retval instanceof Wrapper ? ((Wrapper) retval).unwrap() : retval;
} finally {
Context.exit();
}
}
/**
* This class provides methods to create JavaScript objects from JavaScript files.
*
* @author Hannes Wallnoefer <*****@*****.**>
*/
public class RhinoEngine implements ScopeProvider {
private RingoConfig config;
private List<Repository> repositories;
private RingoGlobal globalScope;
private List<String> commandLineArgs;
private Map<Trackable, ReloadableScript> compiledScripts, interpretedScripts;
private final Map<Singleton, Singleton> singletons;
private AppClassLoader loader = new AppClassLoader();
private WrapFactory wrapFactory;
private Set<Class> hostClasses;
private ModuleLoader[] loaders;
private List<Callback> shutdownHooks;
private RingoContextFactory contextFactory = null;
private ModuleScope mainScope = null;
private final RingoWorker mainWorker;
private final Deque<RingoWorker> workers;
private final ThreadLocal<RingoWorker> currentWorker;
private final AsyncTaskCounter asyncCounter = new AsyncTaskCounter();
private static Logger log = Logger.getLogger(RhinoEngine.class.getName());
public static final List<Integer> VERSION = Collections.unmodifiableList(Arrays.asList(0, 9));
/**
* Create a RhinoEngine with the given configuration. If <code>globals</code> is not null, its
* contents are added as properties on the global object.
*
* @param config the configuration used to initialize the engine.
* @param globals an optional map of global properties
* @throws Exception if the engine can't be created
*/
public RhinoEngine(RingoConfig config, Map<String, Object> globals) throws Exception {
this.config = config;
workers = new LinkedBlockingDeque<RingoWorker>();
currentWorker = new ThreadLocal<RingoWorker>();
mainWorker = new RingoWorker(this);
compiledScripts = new ConcurrentHashMap<Trackable, ReloadableScript>();
interpretedScripts = new ConcurrentHashMap<Trackable, ReloadableScript>();
singletons = new HashMap<Singleton, Singleton>();
contextFactory = new RingoContextFactory(this, config);
repositories = config.getRepositories();
wrapFactory = config.getWrapFactory();
loaders =
new ModuleLoader[] {new JsModuleLoader(), new JsonModuleLoader(), new ClassModuleLoader()};
RingoDebugger debugger = null;
if (config.getDebug()) {
debugger = new RingoDebugger(config);
debugger.setScopeProvider(this);
debugger.attachTo(contextFactory);
debugger.setBreakOnExceptions(true);
}
// create and initialize global scope
Context cx = contextFactory.enterContext();
try {
boolean sealed = config.isSealed();
globalScope = new RingoGlobal(cx, this, sealed);
Class<Scriptable>[] classes = config.getHostClasses();
if (classes != null) {
for (Class<Scriptable> clazz : classes) {
defineHostClass(clazz);
}
}
ScriptableList.init(globalScope);
ScriptableMap.init(globalScope);
ScriptableObject.defineClass(globalScope, ScriptableWrapper.class);
ScriptableObject.defineClass(globalScope, ModuleObject.class);
if (globals != null) {
for (Map.Entry<String, Object> entry : globals.entrySet()) {
ScriptableObject.defineProperty(
globalScope, entry.getKey(), entry.getValue(), ScriptableObject.DONTENUM);
}
}
mainWorker.evaluateScript(cx, getScript("globals"), globalScope);
evaluateBootstrapScripts(cx);
if (sealed) {
globalScope.sealObject();
}
if (debugger != null) {
debugger.setBreak();
}
try {
Runtime.getRuntime()
.addShutdownHook(
new Thread() {
public void run() {
shutdown();
}
});
} catch (java.security.AccessControlException e) {
log.log(Level.WARNING, "Could not register shutdown hook due to security exception", e);
}
} finally {
Context.exit();
}
}
/**
* Define a Javascript host object implemented by the given class.
*
* @param clazz The Java class implementing the host object.
* @exception IllegalAccessException if access is not available to a reflected class member
* @exception InstantiationException if unable to instantiate the named class
* @exception InvocationTargetException if an exception is thrown during execution of methods of
* the named class
*/
public void defineHostClass(Class<Scriptable> clazz)
throws InvocationTargetException, InstantiationException, IllegalAccessException {
if (hostClasses != null && hostClasses.contains(clazz)) {
return;
}
synchronized (this) {
if (hostClasses == null) {
hostClasses = new HashSet<Class>();
}
hostClasses.add(clazz);
ScriptableObject.defineClass(globalScope, clazz);
}
}
/**
* Invoke a script from the command line.
*
* @param scriptResource the script resource of path
* @param scriptArgs an array of command line arguments
* @return the return value
* @throws IOException an I/O related error occurred
* @throws JavaScriptException the script threw an error during compilation or execution
*/
public Object runScript(Object scriptResource, String... scriptArgs)
throws IOException, JavaScriptException {
Resource resource;
if (scriptResource instanceof Resource) {
resource = (Resource) scriptResource;
} else if (scriptResource instanceof String) {
resource = findResource((String) scriptResource, null, null);
} else {
throw new IOException("Unsupported script resource: " + scriptResource);
}
if (!resource.exists()) {
throw new FileNotFoundException(scriptResource.toString());
}
Context cx = contextFactory.enterContext();
try {
Object retval;
Map<Trackable, ReloadableScript> scripts = getScriptCache(cx);
commandLineArgs = Arrays.asList(scriptArgs);
ReloadableScript script = new ReloadableScript(resource, this);
scripts.put(resource, script);
mainScope = new ModuleScope(resource.getModuleName(), resource, globalScope, mainWorker);
retval = mainWorker.evaluateScript(cx, script, mainScope);
mainScope.updateExports();
return retval instanceof Wrapper ? ((Wrapper) retval).unwrap() : retval;
} finally {
Context.exit();
}
}
/**
* Evaluate an expression from the command line.
*
* @param expr the JavaScript expression to evaluate
* @return the return value
* @throws IOException an I/O related error occurred
* @throws JavaScriptException the script threw an error during compilation or execution
*/
public Object evaluateExpression(String expr) throws IOException, JavaScriptException {
Context cx = contextFactory.enterContext();
cx.setOptimizationLevel(-1);
try {
Object retval;
Repository repository = repositories.get(0);
Scriptable parentScope = mainScope != null ? mainScope : globalScope;
ModuleScope scope = new ModuleScope("<expr>", repository, parentScope, mainWorker);
Resource res = new StringResource("<expr>", expr, 1);
ReloadableScript script = new ReloadableScript(res, this);
retval = mainWorker.evaluateScript(cx, script, scope);
return retval instanceof Wrapper ? ((Wrapper) retval).unwrap() : retval;
} finally {
Context.exit();
}
}
/**
* Invoke a javascript function. This enters a JavaScript context, creates a new per-thread scope,
* calls the function, exits the context and returns the return value of the invocation.
*
* @param module the module name or object, or null for the main module
* @param method the method name to call in the script
* @param args the arguments to pass to the method
* @return the return value of the invocation
* @throws NoSuchMethodException the method is not defined
* @throws IOException an I/O related error occurred
*/
public Object invoke(Object module, String method, Object... args)
throws IOException, NoSuchMethodException, ExecutionException, InterruptedException {
return mainWorker.invoke(module, method, args);
}
/**
* Associate a worker with the current worker and return the worker that was previously associated
* with it, or null.
*
* @param worker the new worker associated with the current thread
* @return the worker previously associated with the current thread, or null
*/
protected RingoWorker setCurrentWorker(RingoWorker worker) {
RingoWorker previousWorker = currentWorker.get();
currentWorker.set(worker);
return previousWorker;
}
/**
* Get the worker associated with the given scope, or null.
*
* @return the worker associated with the current thread, or null.
*/
public RingoWorker getCurrentWorker() {
return currentWorker.get();
}
/**
* Get the main worker running the main script.
*
* @return the main worker
*/
public RingoWorker getMainWorker() {
return mainWorker;
}
/**
* Get a new {@link RingoWorker}.
*
* @return a worker instance.
*/
public RingoWorker getWorker() {
RingoWorker worker = workers.pollFirst();
if (worker == null) {
worker = new RingoWorker(this);
}
return worker;
}
/**
* Return a worker, returning it to the worker pool.
*
* @param worker the worker to be released
*/
void returnWorker(RingoWorker worker) {
if (!workers.offerFirst(worker)) {
worker.shutdown();
}
}
synchronized void shutdown() {
List<Callback> hooks = shutdownHooks;
if (hooks != null) {
for (Callback callback : hooks) {
try {
Object result = callback.invoke();
if (!callback.sync && result instanceof Future) {
((Future) result).get();
}
} catch (Exception x) {
log.log(Level.WARNING, "Error in shutdown hook", x);
}
}
shutdownHooks = null;
}
}
/**
* Add a callback to be invoked on shutdown.
*
* @param callback a callback function wrapper
* @param sync whether to invoke the callback synchronously (on the main shutdown thread) or
* asynchronously (on the worker's event loop thread)
*/
public synchronized void addShutdownHook(Scriptable callback, boolean sync) {
List<Callback> hooks = shutdownHooks;
if (hooks == null) {
hooks = shutdownHooks = new ArrayList<Callback>();
}
hooks.add(new Callback(callback, this, sync));
}
/**
* Get the list of errors encountered by the main worker.
*
* @return a list of errors, may be null.
*/
public List<ScriptError> getMainErrors() {
return mainWorker.getErrors();
}
/**
* Return a shell scope for interactive evaluation
*
* @return a shell scope
* @throws IOException an I/O related exception occurred
*/
public Scriptable getShellScope(RingoWorker worker) throws IOException {
Repository repository = new FileRepository("");
repository.setAbsolute(true);
Scriptable protoScope = mainScope != null ? mainScope : globalScope;
return new ModuleScope("<shell>", repository, protoScope, worker);
}
/**
* Get the engine's global shared scope
*
* @return the global scope
*/
public Scriptable getScope() {
return globalScope;
}
/**
* Initialize and normalize the global variables and arguments on a thread scope.
*
* @param args the arguments
*/
protected void initArguments(Object[] args) {
if (args != null) {
for (int i = 0; i < args.length; i++) {
args[i] = wrapArgument(args[i], globalScope);
}
}
}
/**
* Prepare a single property or argument value for use within rhino.
*
* @param value the property or argument value
* @param scope the scope
* @return the object wrapped and wired for rhino
*/
public static Object wrapArgument(Object value, Scriptable scope) {
if (value instanceof ScriptableObject) {
ScriptableObject scriptable = ((ScriptableObject) value);
// Avoid overwriting prototype and parent scope as this would break closures
if (scriptable.getPrototype() == null) {
scriptable.setPrototype(
ScriptableObject.getClassPrototype(scope, scriptable.getClassName()));
}
if (scriptable.getParentScope() == null) {
scriptable.setParentScope(scope);
}
return scriptable;
} else {
return Context.javaToJS(value, scope);
}
}
/**
* Get the current Rhino optimization level
*
* @return the current optimization level
*/
public int getOptimizationLevel() {
Context cx = Context.getCurrentContext();
if (cx != null) {
return cx.getOptimizationLevel();
}
return 0;
}
/**
* Set Rhino optimization level
*
* @param level the new optimization level
*/
public void setOptimizationLevel(int level) {
Context cx = Context.getCurrentContext();
if (cx != null && cx.getOptimizationLevel() != level) {
cx.setOptimizationLevel(level);
}
}
/**
* Resolves a type name to a script file within our script directory and returns a Scriptable
* evaluated to the file.
*
* @param moduleName the name of the module to load
* @return The raw compiled script for the module
* @throws JavaScriptException if an error occurred evaluating the script file
* @throws IOException if an error occurred reading the script file
*/
public ReloadableScript getScript(String moduleName) throws JavaScriptException, IOException {
return getScript(moduleName, null);
}
/**
* Resolves a type name to a script file within our script directory and returns a Scriptable
* evaluated to the file.
*
* @param moduleName the name of the module to load
* @param localPath the path of the resource issuing this call
* @return The raw compiled script for the module
* @throws JavaScriptException if an error occurred evaluating the script file
* @throws IOException if an error occurred reading the script file
*/
public ReloadableScript getScript(String moduleName, Repository localPath)
throws JavaScriptException, IOException {
ReloadableScript script;
Resource source = findResource(moduleName, loaders, localPath);
if (!source.exists()) {
source = loadPackage(moduleName, localPath);
if (!source.exists()) {
source = findResource(moduleName, null, localPath);
}
}
Context cx = Context.getCurrentContext();
Map<Trackable, ReloadableScript> scripts = getScriptCache(cx);
if (scripts.containsKey(source)) {
script = scripts.get(source);
} else {
script = new ReloadableScript(source, this);
if (source.exists()) {
scripts.put(source, script);
}
}
return script;
}
/**
* Resolves a module id to a package resource. If module id consists of just one term and resolves
* to a package directory, the main module of the package is returned. If the module id consists
* of several terms and the first term resolves to a package directory, the remaining part of the
* module id is resolved against the "lib" directory of the package.
*
* @link http://nodejs.org/docs/v0.4.4/api/modules.html#folders_as_Modules
* @param moduleName the name of the package to load
* @param localPath the path of the resource issuing this call
* @return the location of the package's main module
* @throws IOException an unrecoverable I/O exception occurred while reading the package
*/
protected Resource loadPackage(String moduleName, Repository localPath) throws IOException {
int slash = 0;
String packageName, remainingName;
do {
slash = moduleName.indexOf('/', slash + 1);
if (slash == -1) {
packageName = moduleName;
remainingName = null;
} else {
packageName = moduleName.substring(0, slash);
if (".".equals(packageName) || "..".equals(packageName)) continue;
remainingName = moduleName.substring(slash + 1);
}
Resource json = findResource(packageName + "/package.json", null, localPath);
if (json != null && json.exists()) {
Scriptable obj = parseJsonResource(json);
Repository parent = json.getParentRepository();
String moduleId;
Resource res;
if (remainingName == null) {
// get the main module of this package
moduleId = getStringProperty(obj, "main", null);
if (moduleId != null) {
// optimize for the common case where main module
// property links to the exact file name
res = parent.getResource(moduleId);
if (res != null && res.exists()) return res;
}
} else {
// map remaining name to libs directory
String lib = "lib";
Object dirs = ScriptableObject.getProperty(obj, "directories");
if (dirs instanceof Scriptable) {
lib = getStringProperty((Scriptable) dirs, "lib", "lib");
}
moduleId = lib + "/" + remainingName;
}
if (moduleId != null) {
for (ModuleLoader loader : loaders) {
res = parent.getResource(moduleId + loader.getExtension());
if (res != null && res.exists()) return res;
}
if (remainingName != null) {
res = parent.getResource(moduleId);
if (res != null && res.exists()) return res;
}
}
}
} while (slash != -1);
return findResource(moduleName + "/index", loaders, localPath);
}
private Scriptable parseJsonResource(Resource resource) throws IOException {
JsonParser parser = new JsonParser(Context.getCurrentContext(), globalScope);
try {
Object result = parser.parseValue(resource.getContent());
if (!(result instanceof Scriptable)) {
throw new RuntimeException("Expected Object from package.json, got " + result);
}
return (Scriptable) result;
} catch (JsonParser.ParseException px) {
throw new RuntimeException(px);
}
}
private String getStringProperty(Scriptable obj, String name, String defaultValue) {
Object value = ScriptableObject.getProperty(obj, name);
if (value != null && value != ScriptableObject.NOT_FOUND) {
return ScriptRuntime.toString(value);
}
return defaultValue;
}
/**
* Load a Javascript module into a module scope. This checks if the module has already been loaded
* in the current context and if so returns the existing module scope.
*
* @param cx the current context
* @param moduleName the module name
* @param loadingScope the scope requesting the module
* @return the loaded module's scope
* @throws IOException indicates that in input/output related error occurred
*/
public Scriptable loadModule(Context cx, String moduleName, Scriptable loadingScope)
throws IOException {
return mainWorker.loadModule(cx, moduleName, loadingScope);
}
/**
* Get the name of the main script as module name, if any
*
* @return the main module name, or null
*/
public String getMainModule() {
return config.getMainModule();
}
/**
* Get the main scrip's module scope, if any
*
* @return the main module scope, or null
*/
public ModuleScope getMainModuleScope() {
return mainScope;
}
/**
* Get the script arguments as object array suitable for use with Context.newArray().
*
* @return the script arguments
*/
public Object[] getArguments() {
String[] args = config.getArguments();
if (args == null) {
return ScriptRuntime.emptyArgs;
} else {
Object[] array = new Object[args.length];
System.arraycopy(args, 0, array, 0, args.length);
return array;
}
}
public String getCharset() {
return config.getCharset();
}
/**
* Get the currently active RhinoEngine instance.
*
* @param scope the global scope or a top level module scope
* @return the current RhinoEngine
*/
public static RhinoEngine getEngine(Scriptable scope) {
if (scope instanceof ModuleScope) {
scope = scope.getPrototype();
}
if (scope instanceof RingoGlobal) {
return ((RingoGlobal) scope).getEngine();
}
throw new IllegalArgumentException("Unsupported scope");
}
/**
* Create a sandboxed scripting engine with the same install directory as this and the given
* module paths, global properties, class shutter and sealing
*
* @param config the sandbox configuration
* @param globals a map of predefined global properties, may be null
* @return a sandboxed RhinoEngine instance
* @throws FileNotFoundException if any part of the module paths does not exist
*/
public RhinoEngine createSandbox(RingoConfig config, Map<String, Object> globals)
throws Exception {
config.setPolicyEnabled(this.config.isPolicyEnabled());
return new RhinoEngine(config, globals);
}
protected boolean isPolicyEnabled() {
// only use security when ringo runs standalone with default security manager,
// not with google app engine
return config.isPolicyEnabled();
}
/**
* Wait until all daemon threads running in this engine have terminated.
*
* @throws InterruptedException if the current thread has been interrupted
*/
public void waitForAsyncTasks() throws InterruptedException {
asyncCounter.waitTillDone();
}
protected void enterAsyncTask() {
asyncCounter.increase();
}
protected void exitAsyncTask() {
asyncCounter.decrease();
}
private Map<Trackable, ReloadableScript> getScriptCache(Context cx) {
return cx.getOptimizationLevel() == -1 ? interpretedScripts : compiledScripts;
}
private void evaluateBootstrapScripts(Context cx) throws IOException {
List<String> bootstrapScripts = config.getBootstrapScripts();
if (bootstrapScripts != null) {
for (String script : bootstrapScripts) {
Resource resource = new FileResource(script);
// not found, attempt to resolve the file relative to ringo home
if (!resource.exists()) {
resource = getRingoHome().getResource(script);
}
if (resource == null || !resource.exists()) {
throw new FileNotFoundException("Bootstrap script " + script + " not found");
}
mainWorker.evaluateScript(cx, new ReloadableScript(resource, this), globalScope);
}
}
}
/**
* Get the list of command line arguments
*
* @return the command line arguments passed to this engine
*/
public List<String> getCommandLineArguments() {
if (commandLineArgs == null) {
commandLineArgs = Collections.emptyList();
}
return Collections.unmodifiableList(commandLineArgs);
}
/**
* Get the engine's module search path as a list of repositories
*
* @return the module repositories
*/
public List<Repository> getRepositories() {
return repositories;
}
/**
* Get the our installation directory.
*
* @return the RingoJS installation directory
*/
public Repository getRingoHome() {
return config.getRingoHome();
}
/**
* Get the repository associated with the scope or one of its prototypes
*
* @param scope the scope to get the repository from
* @return the repository, or null
*/
public Repository getParentRepository(Scriptable scope) {
while (scope != null) {
if (scope instanceof ModuleScope) {
return ((ModuleScope) scope).getRepository();
}
scope = scope.getPrototype();
}
return null;
}
/**
* Get a list of all child resources for the given path relative to our script repository.
*
* @param path the repository path
* @param recursive whether to include nested resources
* @return a list of all contained child resources
*/
public List<Resource> findResources(String path, boolean recursive) throws IOException {
return config.getResources(path, recursive);
}
/**
* Try to resolve path to a resource or repository relative to a local path, or the engine's
* repository path.
*
* @param path the resource name
* @param localRoot a repository to look first
* @return the resource or repository
* @throws IOException if an I/O error occurred
*/
public Trackable resolve(String path, Repository localRoot) throws IOException {
Trackable t = findResource(path, null, localRoot);
if (t == null || !t.exists()) {
t = findRepository(path, localRoot);
}
return t;
}
/**
* Search for a resource in a local path, or the main repository path.
*
* @param path the resource name
* @param loaders optional list of module loaders
* @param localRoot a repository to look first
* @return the resource
* @throws IOException if an I/O error occurred
*/
public Resource findResource(String path, ModuleLoader[] loaders, Repository localRoot)
throws IOException {
// Note: as an extension to the CommonJS modules API
// we allow absolute module paths for resources
File file = new File(path);
if (file.isAbsolute()) {
Resource res;
outer:
if (loaders != null) {
// loaders must contain at least one loader
assert loaders.length > 0 && loaders[0] != null;
for (ModuleLoader loader : loaders) {
res = new FileResource(path + loader.getExtension());
if (res.exists()) {
break outer;
}
}
res = new FileResource(path + loaders[0].getExtension());
} else {
res = new FileResource(file);
}
res.setAbsolute(true);
return res;
} else if (localRoot != null && (path.startsWith("./") || path.startsWith("../"))) {
String newpath = localRoot.getRelativePath() + path;
return findResource(newpath, loaders, null);
} else {
return config.getResource(normalizePath(path), loaders);
}
}
/**
* Search for a repository in the local path, or the main repository path.
*
* @param path the repository name
* @param localPath a repository to look first
* @return the repository
* @throws IOException if an I/O error occurred
*/
public Repository findRepository(String path, Repository localPath) throws IOException {
// To be consistent, always return absolute repository if path is absolute
// if we make this dependent on whether files exist we introduce a lot of
// vague and undetermined behaviour.
File file = new File(path);
if (file.isAbsolute()) {
return new FileRepository(file);
}
if (localPath != null) {
Repository repository = localPath.getChildRepository(path);
if (repository != null && repository.exists()) {
return repository;
}
}
return config.getRepository(normalizePath(path));
}
public ModuleLoader getModuleLoader(Resource resource) {
String name = resource.getName();
for (ModuleLoader loader : loaders) {
if (name.endsWith(loader.getExtension())) {
return loader;
}
}
return loaders[0];
}
public synchronized void addModuleLoader(String extension, Object value) {
if (value == null || value == Undefined.instance) {
removeModuleLoader(extension);
} else if (!(value instanceof Function)) {
throw Context.reportRuntimeError("Module loader must be a function");
}
Function function = (Function) value;
int length = loaders.length;
for (int i = 0; i < length; i++) {
if (extension.equals(loaders[i].getExtension())) {
// replace existing loader
loaders[i] = new ScriptedModuleLoader(extension, function);
return;
}
}
ModuleLoader[] newLoaders = new ModuleLoader[length + 1];
System.arraycopy(loaders, 0, newLoaders, 0, length);
newLoaders[length] = new ScriptedModuleLoader(extension, function);
loaders = newLoaders;
}
public synchronized void removeModuleLoader(String extension) {
int length = loaders.length;
for (int i = 0; i < length; i++) {
if (loaders[i] instanceof ScriptedModuleLoader
&& extension.equals(loaders[i].getExtension())) {
ModuleLoader[] newLoaders = new ModuleLoader[length - 1];
if (i > 0) System.arraycopy(loaders, 0, newLoaders, 0, i);
if (i < length - 1) System.arraycopy(loaders, i + 1, newLoaders, i, length - i - 1);
loaders = newLoaders;
return;
}
}
}
public static String normalizePath(String path) {
if (!path.contains("./")) {
return path;
}
boolean absolute = path.startsWith("/");
String[] elements = path.split(Repository.SEPARATOR);
LinkedList<String> list = new LinkedList<String>();
for (String e : elements) {
if ("..".equals(e)) {
if (list.isEmpty() || "..".equals(list.getLast())) {
list.add(e);
} else {
list.removeLast();
}
} else if (!".".equals(e) && e.length() > 0) {
list.add(e);
}
}
StringBuilder sb = new StringBuilder(path.length());
if (absolute) {
sb.append("/");
}
int count = 0, last = list.size() - 1;
for (String e : list) {
sb.append(e);
if (count++ < last) sb.append("/");
}
return sb.toString();
}
public void addToClasspath(Trackable path) throws MalformedURLException {
loader.addURL(path.getUrl());
}
public RingoContextFactory getContextFactory() {
return contextFactory;
}
public RingoClassLoader getClassLoader() {
return loader;
}
public RingoConfig getConfig() {
return config;
}
Singleton getSingleton(Singleton singleton) {
synchronized (singletons) {
Singleton st = singletons.get(singleton);
if (st == null) {
st = singleton;
singletons.put(singleton, singleton);
}
return st;
}
}
/**
* Get a wrapper for a string that exposes the java.lang.String methods to JavaScript This is
* useful for accessing strings as java.lang.String without the cost of creating a new instance.
*
* @param object an object
* @return the object converted to a string and wrapped as native java object
*/
public Object asJavaString(Object object) {
if (!(object instanceof String)) {
object = object.toString();
}
Context cx = Context.getCurrentContext();
return wrapFactory.wrapAsJavaObject(cx, globalScope, object, null);
}
/**
* Get a wrapper for an object that exposes it as Java object to JavaScript.
*
* @param object an object
* @return the object wrapped as native java object
*/
public Object asJavaObject(Object object) {
if (object instanceof Wrapper) {
object = ((Wrapper) object).unwrap();
}
Context cx = Context.getCurrentContext();
return wrapFactory.wrapAsJavaObject(cx, globalScope, object, null);
}
/**
* Get the engine's WrapFactory.
*
* @return the engine's WrapFactory instance
*/
public WrapFactory getWrapFactory() {
return wrapFactory;
}
static class AsyncTaskCounter {
int count = 0;
synchronized void waitTillDone() throws InterruptedException {
while (count > 0) {
wait();
}
}
synchronized void increase() {
++count;
}
synchronized void decrease() {
if (--count <= 0) {
notifyAll();
}
}
}
}