Examples of org.mozilla.javascript.Context

org.mozilla.javascript.Context
This class represents the runtime context of an executing script. Before executing a script, an instance of Context must be created and associated with the thread that will be executing the script. The Context will be used to store information about the executing of the script such as the call stack. Contexts are associated with the current thread using the {@link #call(ContextAction)}or {@link #enter()} methods.
Different forms of script execution are supported. Scripts may be evaluated from the source directly, or first compiled and then later executed. Interactive execution is also supported.
Some aspects of script execution, such as type conversions and object creation, may be accessed directly through methods of Context. @see Scriptable @author Norris Boyd @author Brendan Eich

     * To be used by <code>WindowWrapper</code>.
     */
    void callHandler(Function handler,
                     ArgumentsBuilder ab)
        throws JavaScriptException {
        Context ctx = enterContext();


        try {
            handler.call(ctx, globalObject, globalObject, ab.buildArguments());
        } finally {
            Context.exit();

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        Context.setCachingEnabled(false); // reset the cache
        Context.setCachingEnabled(true);  // enable caching again
        // entering a context
        defaultContext = enterContext();
        Context ctx = defaultContext;
            
        try {


            // init std object with an importer
            // building the importer automatically initialize the
            // context with it since Rhino1.5R3
            ImporterTopLevel importer = new ImporterTopLevel(ctx);
            globalObject = importer;
            // import Java lang package & DOM Level 2 & SVG DOM packages
            NativeJavaPackage[] p= new NativeJavaPackage[TO_BE_IMPORTED.length];
            for (int i = 0; i < TO_BE_IMPORTED.length; i++) {
                p[i] = new NativeJavaPackage(TO_BE_IMPORTED[i]);
            }
            importer.importPackage(ctx, globalObject, p, null);
            ctx.setWrapHandler(wrapHandler);
        } finally {
            Context.exit();
        }
    }

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    /**
     * Implementation helper. Makes sure the proper security is set 
     * on the context.
     */
    public Context enterContext(){
        Context ctx = Context.enter();
        if (ctx != defaultContext){
            // Set the SecuritySupport the Context should
            // use.
            if (!contexts.contains(ctx)) {
                ctx.setSecuritySupport(securitySupport);
                contexts.add(ctx);


                // Hopefully, we are not switching threads too 
                // often ....
                defaultContext = ctx;

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     * value of the last expression evaluated in the script.
     */
    public Object evaluate(Reader scriptreader)
        throws InterpreterException, IOException {
        Object rv = null;
        Context ctx = enterContext();


        ctx.setWrapHandler(wrapHandler);
        try {
            rv = ctx.evaluateReader(globalObject,
                                    scriptreader,
                                    SOURCE_NAME_SVG,
                                    1, rhinoClassLoader);
        } catch (JavaScriptException e) {
            // exception from JavaScript (possibly wrapping a Java Ex)

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     * value of the last expression evaluated in the script.
     */
    public Object evaluate(final String scriptstr)
        throws InterpreterException {
 
        final Context ctx = enterContext();


        ctx.setWrapHandler(wrapHandler);
        Script script = null;
        Entry et = null;
        Iterator it = compiledScripts.iterator();
        // between nlog(n) and log(n) because it is
        // an AbstractSequentialList
        while (it.hasNext()) {
            if ((et = (Entry)(it.next())).str.equals(scriptstr)) {
                // if it is not at the end, remove it because
                // it will change from place (it is faster
                // to remove it now)
                script = et.script;
                it.remove();
                break;
            }
        }


        if (script == null) {
            // this script has not been compiled yet or has been fogotten
            // since the compilation:
            // compile it and store it for future use.


            script = (Script)AccessController.doPrivileged(new PrivilegedAction() {
                    public Object run() {
                        try {
                            return ctx.compileReader(globalObject,
                                                     new StringReader(scriptstr),
                                                     SOURCE_NAME_SVG,
                                                     1, rhinoClassLoader);
                        } catch(IOException io) {
                            // Should never happen: we are using a string

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     * the environment of the interpreter.
     * @param name the name of the script object to create
     * @param object the Java object
     */
    public void bindObject(String name, Object object) {
        Context ctx = enterContext();


        ctx.setWrapHandler(wrapHandler);
        try {
            Scriptable jsObject =  Context.toObject(object, globalObject);
            globalObject.put(name, globalObject, jsObject);
        } finally {
            Context.exit();

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     * To be used by <code>EventTargetWrapper</code>.
     */
    void callHandler(Function handler,
                     Object arg)
        throws JavaScriptException {
        Context ctx = enterContext();


        ctx.setWrapHandler(wrapHandler);
        try {
            arg = Context.toObject(arg, globalObject);
            Object[] args = {arg};
            handler.call(ctx, globalObject, globalObject, args);
        } finally {

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     * To be used by <code>WindowWrapper</code>.
     */
    void callHandler(Function handler,
                     Object[] args)
        throws JavaScriptException {
        Context ctx = enterContext();


        ctx.setWrapHandler(wrapHandler);
        try {
            handler.call(ctx, globalObject, globalObject, args);
        } finally {
            Context.exit();
        }

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     * To be used by <code>WindowWrapper</code>.
     */
    void callHandler(Function handler,
                     ArgumentsBuilder ab)
        throws JavaScriptException {
        Context ctx = enterContext();


        ctx.setWrapHandler(wrapHandler);
        try {
            handler.call(ctx, globalObject, globalObject, ab.buildArguments());
        } finally {
            Context.exit();
        }

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            xmlObject = XmlObject.Factory.parse(new ByteArrayInputStream(xmlBytes));
        } catch (Exception e) {
            throw new InvocationRuntimeException(e);
        }


        Context cx = Context.enter();
        try {


            Object xml = cx.getWrapFactory().wrap(cx, scope, xmlObject, XmlObject.class);
            Scriptable jsXML = cx.newObject(scope, "XML", new Object[] { xml });


            return jsXML;


        } finally {
            Context.exit();

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