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>EventTargetWrapper</code>.
     */
    void callHandler(Function handler,
                     Object arg)
        throws JavaScriptException {
        Context ctx = Context.enter();
        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 = Context.enter();
        ctx.setWrapHandler(wrapHandler);
        try {
            handler.call(ctx, globalObject, globalObject, args);
        } finally {
            Context.exit();
        }

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  JSGlobal scope;


  public void initialize()
    throws Exception
  {
    Context context = Context.enter();
    context.setOptimizationLevel(OPTIMIZATION_LEVEL);


    try {
      scope = new JSGlobal(context);


      // Register some handy classes with JavaScript, so we can make
      // use of them from the flow layer.


      // Access to the Cocoon log
      ScriptableObject.defineClass(scope, JSLog.class);


      // Access to Cocoon internal objects
      ScriptableObject.defineClass(scope, JSCocoon.class);


      // Wrapper for WebContinuation
      ScriptableObject.defineClass(scope, JSWebContinuation.class);


      // Define some functions on the top level scope
      String[] names = { "print" };
      try {
        ((ScriptableObject)scope)
          .defineFunctionProperties(names, JSGlobal.class,
                                    ScriptableObject.DONTENUM);
      } catch (PropertyException e) {
        throw new Error(e.getMessage());
      }


      // Define some global variables in JavaScript
      Object args[] = {};
      Scriptable log = context.newObject(scope, "Log", args);
      ((JSLog)log).setLogger(getLogger());
      scope.put("log", scope, log);


    } catch (Exception e) {
      context.exit();
      System.out.println("problem initializing JavaScriptInterpreter: ");
      e.printStackTrace();
      throw e;
    }
  }

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  }


  protected Scriptable enterContext(Environment environment, InvokeContext ctx)
    throws Exception
  {
    Context context = Context.enter();
    context.setOptimizationLevel(OPTIMIZATION_LEVEL);
    context.setCompileFunctionsWithDynamicScope(true);
    Scriptable thrScope = context.newObject(scope);


    thrScope.setPrototype(scope);
    // We want 'thrScope' to be a new top-level scope, so set its
    // parent scope to null. This means that any variables created
    // by assignments will be properties of "thrScope".
    thrScope.setParentScope(null);


    // Put in the thread scope the Cocoon object, which gives access
    // to the interpreter object, and some Cocoon objects. See
    // JSCocoon for more details.
    Object args[] = {};
    Scriptable cocoon = context.newObject(scope, "Cocoon", args);
    ((JSCocoon)cocoon).setInterpreter(this);
    ((JSCocoon)cocoon).setContext(manager, environment, ctx);
    ((JSCocoon)cocoon).setContinuationsManager(continuationsMgr);
    ((JSCocoon)cocoon).setScope(thrScope);
    thrScope.put("cocoon", thrScope, cocoon);

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    try {
      thrScope = enterContext(environment, null);
      source = environment.resolve(sourceName);
      InputStream inputStream = source.getInputStream();
      Reader reader = new BufferedReader(new InputStreamReader(inputStream));
      Context ctx = Context.getCurrentContext();
      ctx.evaluateReader(scope, reader, sourceName, 1, null);
    }
    catch (Exception ex) {
      ex.printStackTrace();
      throw ex;
    }

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      if (fun == Scriptable.NOT_FOUND)
        throw new RuntimeException("'" + funName + "' is undefined!");
      if (!(fun instanceof Function))
        throw new RuntimeException("'" + funName + "' is not a function!");


      Context cx = Context.getCurrentContext();


      int size = (params != null ? params.size() : 0);
      Object[] funArgs = new Object[size];
      if (size != 0) {
        for (int i = 0; i < size; i++) {

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    WebContinuation wk = continuationsMgr.lookupWebContinuation(id);


    if (wk == null)
      throw new RuntimeException("No continuation with id " + id);


    Context context = Context.enter();
    context.setOptimizationLevel(OPTIMIZATION_LEVEL);
    context.setCompileFunctionsWithDynamicScope(true);


    // Obtain the JS continuation object from it, and setup the
    // JSCocoon object associated in the dynamic scope of the saved
    // continuation with the environment and context objects.
    JSWebContinuation jswk = (JSWebContinuation)wk.getUserObject();
    JSCocoon cocoon = jswk.getJSCocoon();
    cocoon.setContext(manager, environment, ctx);
    Scriptable kScope = cocoon.getScope();


    // We can now resume the processing from the state saved by the
    // continuation object. Setup the JavaScript Context object.
    Object handleContFunction = scope.get("handleContinuation", kScope);
    if (handleContFunction == Scriptable.NOT_FOUND)
      throw new RuntimeException("Cannot find 'handleContinuation' "
                                 + "(system.js not loaded?)");


    Object args[] = { jswk };
    try {
      ((Function)handleContFunction).call(context, kScope, kScope, args);
    }
    finally {
      context.exit();
    }
  }

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                throw new ScriptFrameworkErrorException( 
                    nsc.getMessage(), null,
                    metaData.getLanguageName(), metaData.getLanguage(),
                    ScriptFrameworkErrorType.UNKNOWN );
            }
            Context ctxt = null;


            try 
            { 
                String editorURL = sourceUrl.toString();
                Object result = null;
                String source = null;
                ScriptEditorForJavaScript editor =
                    ScriptEditorForJavaScript.getEditor(
                        metaData.getSourceURL() );


                if (editor != null)
                {
                    editorURL = editor.getURL();
                    result = editor.execute();
                    if ( result != null  && 
                         result.getClass().getName().equals( "org.mozilla.javascript.Undefined" ) )
                    {
                        // Always return a string
                        // TODO revisit
                        return Context.toString( result );
                    }
    
                }


                if (editor != null && editor.isModified() == true)
                {
                    LogUtils.DEBUG("GOT A MODIFIED SOURCE");
                    source = editor.getText();
                }
                else
                {
                    metaData.loadSource();
                    source =  metaData.getSource();


                }


                if ( source == null || source.length() == 0 ) {
                    throw new ScriptFrameworkErrorException( 
                        "Failed to read source data for script", null,
                        metaData.getLanguageName(), metaData.getLanguage(),
                        ScriptFrameworkErrorType.UNKNOWN );
                }


                /* Set the context ClassLoader on the current thread to
                   be our custom ClassLoader. This is the suggested method
                   for setting up a ClassLoader to be used by the Rhino
                   interpreter
                 */
                if (cl != null) {
                    Thread.currentThread().setContextClassLoader(cl);
                }


                // Initialize a Rhino Context object
                ctxt = Context.enter();


                /* The ImporterTopLevel ensures that importClass and
                   importPackage statements work in Javascript scripts
                   Make the XScriptContext available as a global variable
                   to the script
                 */
                ImporterTopLevel scope = new ImporterTopLevel(ctxt);


                Scriptable jsCtxt = Context.toObject(
                   ScriptContext.createContext(
                       m_xModel, m_xInvocContext, m_xContext,
                       m_xMultiComponentFactory), scope);
                scope.put("XSCRIPTCONTEXT", scope, jsCtxt);


                Scriptable jsArgs = Context.toObject(params, scope);
                scope.put("ARGUMENTS", scope, jsArgs);


                result = ctxt.evaluateString(scope,
                        source, "<stdin>", 1, null);
                result = ctxt.toString(result);
        return result;
            }
            catch (JavaScriptException jse) {
                LogUtils.DEBUG( "Caught JavaScriptException exception for JavaScript type = " + jse.getClass() );
                String message = jse.getMessage();

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        }
        
    }
    private Scriptable getScope(XScriptContext xsctxt ) 
    {
        Context ctxt = Context.enter();
        ImporterTopLevel scope = new ImporterTopLevel(ctxt);


        Scriptable jsCtxt = Context.toObject(xsctxt, scope);
        scope.put("XSCRIPTCONTEXT", scope, jsCtxt);

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      String resultStr = "";
      boolean result = false;


      // now evaluate the condition using JavaScript
      Context cx = Context.enter();
      try {
          Scriptable scope = cx.initStandardObjects(null);
          Object cxResultObject =
            cx.evaluateString(scope, getCondition()
          /*** conditionString ***/
          , "<cmd>", 1, null);
          resultStr = Context.toString(cxResultObject);


          if (resultStr.equals("false")) {

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