public static boolean addDefaultHandlersIfNotAvailable(Registry configSystemRegistry)
      throws RegistryException, FileNotFoundException, XMLStreamException {

    if (!configSystemRegistry.resourceExists(RegistryConstants.HANDLER_CONFIGURATION_PATH)) {
      Collection handlerConfigurationCollection = new CollectionImpl();
      String description = "Handler configurations are stored here.";
      handlerConfigurationCollection.setDescription(description);
      configSystemRegistry.put(
          RegistryConstants.HANDLER_CONFIGURATION_PATH, handlerConfigurationCollection);
      // We don't have any default handler configuration as in lifecycles.
    } else {
      // configue all handlers
      Resource handlerRoot = configSystemRegistry.get(getContextRoot());
      if (!(handlerRoot instanceof Collection)) {
        String msg =
            "Failed to continue as the handler configuration root: "
                + getContextRoot()
                + " is not a collection.";
        log.error(msg);
        throw new RegistryException(msg);
      }
      Collection handlerRootCol = (Collection) handlerRoot;
      String[] handlerConfigPaths = handlerRootCol.getChildren();
      if (handlerConfigPaths != null) {
        for (String handlerConfigPath : handlerConfigPaths) {
          generateHandler(configSystemRegistry, handlerConfigPath);
        }
      }
    }

    return true;
  }
  public static boolean deleteHandler(Registry configSystemRegistry, String name)
      throws RegistryException, XMLStreamException {
    if (isHandlerNameInUse(name))
      throw new RegistryException("Handler could not be deleted, since it is already in use!");

    String path = getContextRoot() + name;
    if (configSystemRegistry.resourceExists(path)) {
      try {
        configSystemRegistry.beginTransaction();
        removeHandler(configSystemRegistry, name);
        configSystemRegistry.delete(path);
        configSystemRegistry.commitTransaction();
      } catch (Exception e) {
        configSystemRegistry.rollbackTransaction();
        throw new RegistryException("Unable to remove handler", e);
      }
      return true;
    }
    return false;
  }
  /**
   * Simulates a configSystemRegistry operation.
   *
   * <p>Operation criteria: get - path put - path, resourcePath (existing resource), optional :
   * mediaType resourceExists - path delete - path importResource - path, param1 (URL: source URL),
   * optional : mediaType copy - path, param1 (target path) move - path, param1 (target path) rename
   * - path, param1 (target path) removeLink - path createLink - path, param1 (target path),
   * optional : param2 (target sub-path) invokeAspect - path, param1 (aspect name), param2 (action)
   * addAssociation - path, param1 (target path), param2 (association type) removeAssociation -
   * path, param1 (target path), param2 (association type) getAssociations - path, param1
   * (association type) getAllAssociations - path createVersion - path restoreVersion - path
   * getVersions - path applyTag - path, param1 (tag) removeTag - path, param1 (tag) getTags - path
   * getResourcePathsWithTag - param1 (tag) rateResource - path, param1 (Number: rating) getRating -
   * path, param1 (username) getAverageRating - path addComment - path, param1 (comment)
   * removeComment - path editComment - path, param1 (comment) getComments - path searchContent -
   * param1 (keywords) executeQuery - param1 (Map: parameters, ex:- key1:val1,key2:val2,...),
   * optional: path
   *
   * <p>Operations not-supported dump restore
   *
   * @param simulationRequest the simulation request.
   * @throws Exception if an exception occurs while executing any operation, or if an invalid
   *     parameter was entered.
   */
  public static void simulateRegistryOperation(
      Registry rootRegistry, SimulationRequest simulationRequest) throws Exception {
    String operation = simulationRequest.getOperation();
    if (operation == null) {
      return;
    }
    if (operation.toLowerCase().equals("get")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.get(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("resourceexists")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.resourceExists(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("put")) {
      String path = simulationRequest.getPath();
      String resourcePath = simulationRequest.getResourcePath();
      String type = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        type = params[0];
      }

      if (isInvalidateValue(path) || isInvalidateValue(type)) {
        return;
      }
      Resource resource;
      if (!isInvalidateValue(resourcePath) && rootRegistry.resourceExists(resourcePath)) {
        resource = rootRegistry.get(resourcePath);
      } else if (type.toLowerCase().equals("collection")) {
        resource = rootRegistry.newCollection();
      } else {
        resource = rootRegistry.newResource();
      }
      simulationService.setSimulation(true);
      resource.setMediaType(simulationRequest.getMediaType());
      rootRegistry.put(path, resource);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("delete")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.delete(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("importresource")) {
      String path = simulationRequest.getPath();
      String sourceURL = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        sourceURL = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(sourceURL)) {
        return;
      }
      simulationService.setSimulation(true);
      Resource resource = rootRegistry.newResource();
      resource.setMediaType(simulationRequest.getMediaType());
      rootRegistry.importResource(path, sourceURL, resource);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("rename")) {
      String path = simulationRequest.getPath();
      String target = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        target = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(target)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.rename(path, target);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("move")) {
      String path = simulationRequest.getPath();
      String target = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        target = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(target)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.move(path, target);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("copy")) {
      String path = simulationRequest.getPath();
      String target = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        target = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(target)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.copy(path, target);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("removelink")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.removeLink(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("createlink")) {
      String path = simulationRequest.getPath();
      String target = null;
      String targetSubPath = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length > 0) {
        target = params[0];
        if (params.length > 1) {
          targetSubPath = params[1];
        }
      }
      if (isInvalidateValue(path) || isInvalidateValue(target)) {
        return;
      }
      simulationService.setSimulation(true);
      if (isInvalidateValue(targetSubPath)) {
        rootRegistry.createLink(path, target);
      } else {
        rootRegistry.createLink(path, target, targetSubPath);
      }
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("invokeaspect")) {
      String path = simulationRequest.getPath();
      String aspectName = null;
      String action = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 2) {
        aspectName = params[0];
        action = params[1];
      }
      if (isInvalidateValue(path) || isInvalidateValue(aspectName) || isInvalidateValue(action)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.invokeAspect(path, aspectName, action);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("addassociation")) {
      String path = simulationRequest.getPath();
      String target = null;
      String associationType = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 2) {
        target = params[0];
        associationType = params[1];
      }
      if (isInvalidateValue(path)
          || isInvalidateValue(target)
          || isInvalidateValue(associationType)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.addAssociation(path, target, associationType);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("removeassociation")) {
      String path = simulationRequest.getPath();
      String target = null;
      String associationType = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 2) {
        target = params[0];
        associationType = params[1];
      }
      if (isInvalidateValue(path)
          || isInvalidateValue(target)
          || isInvalidateValue(associationType)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.removeAssociation(path, target, associationType);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("getassociations")) {
      String path = simulationRequest.getPath();
      String associationType = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        associationType = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(associationType)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.getAssociations(path, associationType);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("getallassociations")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.getAllAssociations(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("createversion")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.createVersion(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("restoreversion")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.restoreVersion(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("getversions")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.getVersions(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("applytag")) {
      String path = simulationRequest.getPath();
      String tag = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        tag = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(tag)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.applyTag(path, tag);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("removetag")) {
      String path = simulationRequest.getPath();
      String tag = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        tag = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(tag)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.removeTag(path, tag);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("gettags")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.getTags(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("getresourcepathswithtag")) {
      String tag = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        tag = params[0];
      }
      if (isInvalidateValue(tag)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.getResourcePathsWithTag(tag);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("rateresource")) {
      String path = simulationRequest.getPath();
      int rating = -1;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        try {
          rating = Integer.parseInt(params[0]);
        } catch (NumberFormatException ignored) {
          return;
        }
      }
      if (isInvalidateValue(path) || rating == -1) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.rateResource(path, rating);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("getrating")) {
      String path = simulationRequest.getPath();
      String username = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        username = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(username)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.getRating(path, username);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("getaveragerating")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.getAverageRating(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("addcomment")) {
      String path = simulationRequest.getPath();
      String comment = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        comment = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(comment)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.addComment(path, new Comment(comment));
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("editcomment")) {
      String path = simulationRequest.getPath();
      String comment = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        comment = params[0];
      }
      if (isInvalidateValue(path) || isInvalidateValue(comment)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.editComment(path, comment);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("removeComment")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.removeComment(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("getcomments")) {
      String path = simulationRequest.getPath();
      if (isInvalidateValue(path)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.getComments(path);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("searchcontent")) {
      String keywords = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        keywords = params[0];
      }
      if (isInvalidateValue(keywords)) {
        return;
      }
      simulationService.setSimulation(true);
      rootRegistry.searchContent(keywords);
      simulationService.setSimulation(false);
    } else if (operation.toLowerCase().equals("executequery")) {
      String path = simulationRequest.getPath();
      String queryParams = null;
      String[] params = simulationRequest.getParameters();
      if (params != null && params.length >= 1) {
        queryParams = params[0];
      }
      Map<String, String> paramMap = new LinkedHashMap<String, String>();
      if (isInvalidateValue(queryParams)) {
        return;
      }
      String[] entries = queryParams.split(",");
      if (entries != null) {
        for (String entry : entries) {
          String[] keyValPair = entry.split(":");
          if (keyValPair != null && keyValPair.length == 2) {
            paramMap.put(keyValPair[0], keyValPair[1]);
          }
        }
      }
      simulationService.setSimulation(true);
      rootRegistry.executeQuery(path, paramMap);
      simulationService.setSimulation(false);
    } else {
      throw new Exception("Unsupported Registry Operation: " + operation);
    }
  }
 public static boolean handlerExists(Registry configSystemRegistry, String name)
     throws RegistryException {
   return configSystemRegistry.resourceExists(getContextRoot() + name);
 }