Examples of org.apache.bsf.BSFManager

org.apache.bsf.BSFManager
This class is the entry point to the bean scripting framework. An application wishing to integrate scripting to a Java app would place an instance of a BSFManager in their code and use its services to register the beans they want to make available for scripting, load scripting engines, and run scripts.
BSFManager serves as the registry of available scripting engines as well. Loading and unloading of scripting engines is supported as well. Each BSFManager loads one engine per language. Several BSFManagers can be created per JVM. @author Sanjiva Weerawarana @author Matthew J. Duftler @author Sam Ruby @author Olivier Gruber (added original debugging support) @author Don Schwarz (added support for registering languages dynamically)

        }


        String location = this.getLocation(modelService);


        // create the manager object and set the classloader
        BSFManager mgr = new BSFManager();
        mgr.setClassLoader(cl);


        mgr.registerBean("dctx", dctx);
        mgr.registerBean("context", context);


        // pre-load the engine to make sure we were called right
        org.apache.bsf.BSFEngine bsfEngine = null;
        try {
            bsfEngine = mgr.loadScriptingEngine(modelService.engineName);
        } catch (BSFException e) {
            throw new GenericServiceException("Problems loading org.apache.bsf.BSFEngine: " + modelService.engineName, e);
        }


        // source the script into a string
        String script = scriptCache.get(localName + "_" + location);


        if (script == null) {
            synchronized (this) {
                script = scriptCache.get(localName + "_" + location);
                if (script == null) {
                    URL scriptUrl = UtilURL.fromResource(location, cl);


                    if (scriptUrl != null) {
                        try {
                            HttpClient http = new HttpClient(scriptUrl);
                            script = http.get();
                        } catch (HttpClientException e) {
                            throw new GenericServiceException("Cannot read script from resource", e);
                        }
                    } else {
                        throw new GenericServiceException("Cannot read script, resource [" + location + "] not found");
                    }
                    if (script == null || script.length() < 2) {
                        throw new GenericServiceException("Null or empty script");
                    }
                    scriptCache.put(localName + "_" + location, script);
                }
            }
        }


        // now invoke the script
        try {
            bsfEngine.exec(location, 0, 0, script);
        } catch (BSFException e) {
            throw new GenericServiceException("Script invocation error", e);
        }


        return mgr.lookupBean("response");
    }

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    }


    public XLoper execute(IFunctionContext context, XLoper[] args) throws RequestException {
        try {
            Object[] a = converter.convert(args, createArgHints(args));
            BSFManager manager = new BSFManager();
            manager.declareBean("context", a, IFunctionContext.class);
            manager.declareBean("args", a, Object[].class);
            Object res = manager.eval(lang, name, 1, 1, source);
            return converter.createFrom(res);
        } catch (Throwable e) {
            throw new RequestException(e);
        }
    }

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            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response)
             throws Exception {


        BSFManager bsfManager = new BSFManager();


        String scriptName = null;
        try {
            scriptName = parseScriptName(mapping.getParameter(), bsfManager);
        } catch (Exception ex) {
            LOG.error("Unable to parse " + mapping.getParameter(), ex);
            throw new Exception("Unable to parse " + mapping.getParameter());
        }
        if (scriptName == null) {
            LOG.error("No script specified in the parameter attribute");
            throw new Exception("No script specified");
        }


        if (LOG.isDebugEnabled()) {
            LOG.debug("Executing script: " + scriptName);
        }


        HttpSession session = request.getSession();
        ServletContext application = getServlet().getServletContext();


        Script script = loadScript(scriptName, application);


        bsfManager.declareBean("request", request,
                HttpServletRequest.class);


        bsfManager.declareBean("response", response,
                HttpServletResponse.class);


        if (session == null) {
            LOG.debug("HTTP session is null");
        } else {
            bsfManager.declareBean("session", session, HttpSession.class);
        }


        bsfManager.declareBean("application", application,
                ServletContext.class);


        bsfManager.declareBean("log", LOG, Log.class);
        StrutsInfo struts = new StrutsInfo(this, mapping, form,
                getResources(request));
        bsfManager.declareBean("struts", struts, StrutsInfo.class);


        for (int x = 0; x < filters.length; x++) {
            filters[x].apply(bsfManager);
        }


        bsfManager.exec(script.lang, script.file.getCanonicalPath(), 0, 0,
                script.string);


        ActionForward af = struts.getForward();
        return af;
    }

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    protected BSFManager bsfManager;


    public ScriptMediator(String scriptKey, String functionName) {
        this.scriptKey = scriptKey;
        this.functionName = functionName;
        bsfManager = new BSFManager();
    }

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      return definition;
    }


    try
    {
      final BSFManager interpreter = new BSFManager();
      interpreter.declareBean("definition", definition, MasterReport.class); //$NON-NLS-1$
      interpreter.declareBean("flowController", flowController, DefaultFlowController.class); //$NON-NLS-1$
      final Object o = interpreter.eval(getLanguage(), "expression", 1, 1, preDataScript);
      if (o instanceof MasterReport == false)
      {
        throw new ReportDataFactoryException("Not a MasterReport");
      }
      return (MasterReport) o; //$NON-NLS-1$

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      return definition;
    }


    try
    {
      final BSFManager interpreter = new BSFManager();
      interpreter.declareBean("definition", definition, MasterReport.class); //$NON-NLS-1$
      interpreter.declareBean("flowController", flowController, DefaultFlowController.class); //$NON-NLS-1$
      final Object o = interpreter.eval(getLanguage(), "expression", 1, 1, script);
      if (o instanceof MasterReport == false)
      {
        throw new ReportDataFactoryException("Not a MasterReport");
      }
      return (MasterReport) o; //$NON-NLS-1$

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      return definition;
    }


    try
    {
      final BSFManager interpreter = new BSFManager();
      interpreter.declareBean("definition", definition, MasterReport.class); //$NON-NLS-1$
      interpreter.declareBean("flowController", flowController, DefaultFlowController.class); //$NON-NLS-1$
      final Object o = interpreter.eval(getLanguage(), "expression", 1, 1, preDataScript);
      if (o instanceof SubReport == false)
      {
        throw new ReportDataFactoryException("Not a SubReport");
      }
      return (SubReport) o; //$NON-NLS-1$

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      return definition;
    }


    try
    {
      final BSFManager interpreter = new BSFManager();
      interpreter.declareBean("definition", definition, SubReport.class); //$NON-NLS-1$
      interpreter.declareBean("flowController", flowController, DefaultFlowController.class); //$NON-NLS-1$
      final Object o = interpreter.eval(getLanguage(), "expression", 1, 1, script);
      if (o instanceof SubReport == false)
      {
        throw new ReportDataFactoryException("Not a MasterReport");
      }
      return (SubReport) o; //$NON-NLS-1$

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   */
  protected BSFManager createInterpreter()
  {
    try
    {
      final BSFManager interpreter = new BSFManager();
      initializeInterpreter(interpreter);
      return interpreter;
    }
    catch (Exception e)
    {

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        if (language == null) {
            throw new BuildException("script language must be specified");
        }


        try {
            BSFManager manager = new BSFManager ();


            for (Iterator i = beans.keySet().iterator(); i.hasNext();) {
                String key = (String) i.next();
                Object value = beans.get(key);
                if (value != null) {
                    manager.declareBean(key, value, value.getClass());
                } else {
                    // BSF uses a hashtable to store values
                    // so cannot declareBean with a null value
                    // So need to remove any bean of this name as
                    // that bean should not be visible
                    manager.undeclareBean(key);
                }
            }


            // execute the script
            manager.exec(language, execName, 0, 0, script);
        } catch (BSFException be) {
            Throwable t = be;
            Throwable te = be.getTargetException();
            if (te != null) {
                if  (te instanceof BuildException) {

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