Examples with Condition org.wso2.carbon.apimgt.throttle.policy.deployer.dto.Condition used on opensource projects

Example 91 with Condition

use of org.wso2.carbon.apimgt.throttle.policy.deployer.dto.Condition in project carbon-apimgt by wso2.

the class SearchResultMappingUtil method setPaginationParams.

/**
 * Sets pagination urls for a SearchResultListDTO object given pagination parameters and url parameters.
 *
 * @param resultListDTO a SearchResultListDTO object
 * @param query         search condition
 * @param limit         max number of objects returned
 * @param offset        starting index
 * @param size          max offset
 */
public static void setPaginationParams(SearchResultListDTO resultListDTO, String query, int offset, int limit, int size) {
    // acquiring pagination parameters and setting pagination urls
    Map<String, Integer> paginatedParams = RestApiCommonUtil.getPaginationParams(offset, limit, size);
    String paginatedPrevious = "";
    String paginatedNext = "";
    if (paginatedParams.get(RestApiConstants.PAGINATION_PREVIOUS_OFFSET) != null) {
        paginatedPrevious = RestApiCommonUtil.getAPIPaginatedURL(paginatedParams.get(RestApiConstants.PAGINATION_PREVIOUS_OFFSET), paginatedParams.get(RestApiConstants.PAGINATION_PREVIOUS_LIMIT), query);
    }
    if (paginatedParams.get(RestApiConstants.PAGINATION_NEXT_OFFSET) != null) {
        paginatedNext = RestApiCommonUtil.getAPIPaginatedURL(paginatedParams.get(RestApiConstants.PAGINATION_NEXT_OFFSET), paginatedParams.get(RestApiConstants.PAGINATION_NEXT_LIMIT), query);
    }
    PaginationDTO paginationDTO = new PaginationDTO();
    paginationDTO.setNext(paginatedNext);
    paginationDTO.setPrevious(paginatedPrevious);
    paginationDTO.setOffset(offset);
    paginationDTO.setLimit(limit);
    paginationDTO.setTotal(size);
    resultListDTO.setPagination(paginationDTO);
}

Example 92 with Condition

use of org.wso2.carbon.apimgt.throttle.policy.deployer.dto.Condition in project carbon-apimgt by wso2.

the class PolicyMappingUtil method mapCondition.

/**
 * Map a org.wso2.carbon.apimgt.throttle.policy.deployer.dto.Condition to a
 * org.wso2.carbon.apimgt.api.model.policy.Condition
 *
 * @param conditionDTO org.wso2.carbon.apimgt.throttle.policy.deployer.dto.Condition
 * @return org.wso2.carbon.apimgt.api.model.policy.Condition object
 */
public static Condition mapCondition(org.wso2.carbon.apimgt.throttle.policy.deployer.dto.Condition conditionDTO) {
    switch(conditionDTO.getConditionType()) {
        case PolicyConstants.IP_RANGE_TYPE:
            IPCondition ipRangeCondition = new IPCondition(PolicyConstants.IP_RANGE_TYPE);
            ipRangeCondition.setInvertCondition(conditionDTO.isInverted());
            ipRangeCondition.setStartingIP(conditionDTO.getName());
            ipRangeCondition.setEndingIP(conditionDTO.getValue());
            return ipRangeCondition;
        case PolicyConstants.IP_SPECIFIC_TYPE:
            IPCondition ipSpecificCondition = new IPCondition(PolicyConstants.IP_SPECIFIC_TYPE);
            ipSpecificCondition.setInvertCondition(conditionDTO.isInverted());
            ipSpecificCondition.setSpecificIP(conditionDTO.getValue());
            return ipSpecificCondition;
        case PolicyConstants.HEADER_TYPE:
            HeaderCondition headerCondition = new HeaderCondition();
            headerCondition.setInvertCondition(conditionDTO.isInverted());
            headerCondition.setHeader(conditionDTO.getName());
            headerCondition.setValue(conditionDTO.getValue());
            return headerCondition;
        case PolicyConstants.JWT_CLAIMS_TYPE:
            JWTClaimsCondition jwtClaimsCondition = new JWTClaimsCondition();
            jwtClaimsCondition.setInvertCondition(conditionDTO.isInverted());
            jwtClaimsCondition.setClaimUrl(conditionDTO.getName());
            jwtClaimsCondition.setAttribute(conditionDTO.getValue());
            return jwtClaimsCondition;
        case PolicyConstants.QUERY_PARAMETER_TYPE:
            QueryParameterCondition queryParameterCondition = new QueryParameterCondition();
            queryParameterCondition.setInvertCondition(conditionDTO.isInverted());
            queryParameterCondition.setParameter(conditionDTO.getName());
            queryParameterCondition.setValue(conditionDTO.getValue());
            return queryParameterCondition;
        default:
            return null;
    }
}

Example 93 with Condition

use of org.wso2.carbon.apimgt.throttle.policy.deployer.dto.Condition in project carbon-apimgt by wso2.

the class PolicyUtil method deployPolicy.

/**
 * Deploy the given throttle policy in the Traffic Manager.
 *
 * @param policy      policy object
 * @param policyEvent policy event object which was triggered
 */
public static void deployPolicy(Policy policy, PolicyEvent policyEvent) {
    EventProcessorService eventProcessorService = ServiceReferenceHolder.getInstance().getEventProcessorService();
    ThrottlePolicyTemplateBuilder policyTemplateBuilder = new ThrottlePolicyTemplateBuilder();
    Map<String, String> policiesToDeploy = new HashMap<>();
    List<String> policiesToUndeploy = new ArrayList<>();
    try {
        PrivilegedCarbonContext.startTenantFlow();
        PrivilegedCarbonContext.getThreadLocalCarbonContext().setTenantDomain(APIConstants.SUPER_TENANT_DOMAIN, true);
        String policyFile;
        String policyString;
        if (Policy.PolicyType.SUBSCRIPTION.equals(policy.getType()) && policy instanceof SubscriptionPolicy) {
            // Add Subscription policy
            policyFile = String.join(APIConstants.DELEM_UNDERSCORE, policy.getTenantDomain(), PolicyConstants.POLICY_LEVEL_SUB, policy.getName());
            policyString = policyTemplateBuilder.getThrottlePolicyForSubscriptionLevel((SubscriptionPolicy) policy);
            policiesToDeploy.put(policyFile, policyString);
        } else if (Policy.PolicyType.APPLICATION.equals(policy.getType()) && policy instanceof ApplicationPolicy) {
            // Add Application policy
            policyFile = String.join(APIConstants.DELEM_UNDERSCORE, policy.getTenantDomain(), PolicyConstants.POLICY_LEVEL_APP, policy.getName());
            policyString = policyTemplateBuilder.getThrottlePolicyForAppLevel((ApplicationPolicy) policy);
            policiesToDeploy.put(policyFile, policyString);
        } else if (Policy.PolicyType.API.equals(policy.getType()) && policy instanceof ApiPolicy) {
            // Add API policy
            policiesToDeploy = policyTemplateBuilder.getThrottlePolicyForAPILevel((ApiPolicy) policy);
            String defaultPolicy = policyTemplateBuilder.getThrottlePolicyForAPILevelDefault((ApiPolicy) policy);
            policyFile = String.join(APIConstants.DELEM_UNDERSCORE, policy.getTenantDomain(), PolicyConstants.POLICY_LEVEL_RESOURCE, policy.getName());
            String defaultPolicyName = policyFile + APIConstants.THROTTLE_POLICY_DEFAULT;
            policiesToDeploy.put(defaultPolicyName, defaultPolicy);
            if (policyEvent instanceof APIPolicyEvent) {
                List<Integer> deletedConditionGroupIds = ((APIPolicyEvent) policyEvent).getDeletedConditionGroupIds();
                // Undeploy removed condition groups
                if (deletedConditionGroupIds != null) {
                    for (int conditionGroupId : deletedConditionGroupIds) {
                        policiesToUndeploy.add(policyFile + APIConstants.THROTTLE_POLICY_CONDITION + conditionGroupId);
                    }
                }
            }
        } else if (Policy.PolicyType.GLOBAL.equals(policy.getType()) && policy instanceof GlobalPolicy) {
            // Add Global policy
            GlobalPolicy globalPolicy = (GlobalPolicy) policy;
            policyFile = String.join(APIConstants.DELEM_UNDERSCORE, PolicyConstants.POLICY_LEVEL_GLOBAL, policy.getName());
            policyString = policyTemplateBuilder.getThrottlePolicyForGlobalLevel(globalPolicy);
            policiesToDeploy.put(policyFile, policyString);
        }
        // Undeploy removed policies
        undeployPolicies(policiesToUndeploy);
        for (Map.Entry<String, String> pair : policiesToDeploy.entrySet()) {
            String policyPlanName = pair.getKey();
            String flowString = pair.getValue();
            String executionPlan = null;
            try {
                executionPlan = eventProcessorService.getActiveExecutionPlan(policyPlanName);
            } catch (ExecutionPlanConfigurationException e) {
                // Deploy new policies
                eventProcessorService.deployExecutionPlan(flowString);
            }
            if (executionPlan != null) {
                // Update existing policies
                eventProcessorService.editActiveExecutionPlan(flowString, policyPlanName);
            }
        }
    } catch (APITemplateException e) {
        log.error("Error in creating execution plan", e);
    } catch (ExecutionPlanConfigurationException | ExecutionPlanDependencyValidationException e) {
        log.error("Error in deploying execution plan", e);
    } finally {
        PrivilegedCarbonContext.endTenantFlow();
    }
}

Example 94 with Condition

use of org.wso2.carbon.apimgt.throttle.policy.deployer.dto.Condition in project carbon-business-process by wso2.

the class HumanTaskStore method deploy.

/**
 * This will simply deploy the new task and will not perform removal of existing tasks, which should be done prior to
 * deploying this task
 * @param humanTaskDU
 * @return List of task configuration Qnames deployed
 * @throws HumanTaskDeploymentException
 */
public List<QName> deploy(HumanTaskDeploymentUnit humanTaskDU) throws HumanTaskDeploymentException {
    List<QName> taskConfigsInPackage = new ArrayList<QName>();
    TTask[] tasks = humanTaskDU.getTasks();
    List<HumanTaskBaseConfiguration> configurations = new ArrayList<HumanTaskBaseConfiguration>();
    if (tasks != null) {
        for (TTask task : tasks) {
            QName taskQName = new QName(humanTaskDU.getNamespace(), task.getName());
            if (log.isDebugEnabled()) {
                log.debug(" Adding task " + task.getName() + "to task configuration");
            }
            TaskConfiguration taskConf = new TaskConfiguration(task, humanTaskDU.getTaskServiceInfo(taskQName), humanTaskDU.getHumanInteractionsDefinition(), humanTaskDU.getWSDLs(), humanTaskDU.getNamespace(), humanTaskDU.getName(), getTenantAxisConfig(), humanTaskDU.getPackageName(), humanTaskDU.getVersion(), humanTaskDU.getHumanTaskDefinitionFile());
            taskConf.setPackageStatus(humanTaskDU.getTaskPackageStatus());
            configurations.add(taskConf);
            if (!taskConf.isErroneous()) {
                createCallBackService(taskConf);
                if (taskConf.getPackageStatus() == TaskPackageStatus.ACTIVE) {
                    deploy(taskConf);
                // activeTaskConfigurationQNameMap.put(taskQName, taskConf.getName());
                }
            }
        }
    }
    TNotification[] notifications = humanTaskDU.getNotifications();
    if (notifications != null) {
        for (TNotification notification : notifications) {
            QName notificationQName = new QName(humanTaskDU.getNamespace(), notification.getName());
            NotificationConfiguration notificationConf = new NotificationConfiguration(notification, humanTaskDU.getNotificationServiceInfo(notificationQName), humanTaskDU.getHumanInteractionsDefinition(), humanTaskDU.getWSDLs(), humanTaskDU.getNamespace(), humanTaskDU.getName(), getTenantAxisConfig(), humanTaskDU.getPackageName(), humanTaskDU.getVersion(), humanTaskDU.getHumanTaskDefinitionFile());
            notificationConf.setPackageStatus(humanTaskDU.getTaskPackageStatus());
            configurations.add(notificationConf);
            if (!notificationConf.isErroneous()) {
                // Deploy the axis2 service only for the active version of the task/notification
                if (notificationConf.getPackageStatus() == TaskPackageStatus.ACTIVE) {
                    deploy(notificationConf);
                // activeTaskConfigurationQNameMap.put(notificationQName, notificationConf.getName());
                }
            }
        }
    }
    // condition if a service name is deployed with same name outside of this task package
    for (HumanTaskBaseConfiguration configuration : configurations) {
        taskConfigurations.add(configuration);
        taskBaseConfigurationHashMap.put(configuration.getName(), configuration);
        taskConfigsInPackage.add(configuration.getName());
        if (configuration.getPackageStatus() == TaskPackageStatus.ACTIVE) {
            activeTaskConfigurationQNameMap.put(configuration.getDefinitionName(), configuration.getName());
        }
    }
    for (TNotification inlineNotification : humanTaskDU.getInlineNotifications()) {
        QName notificationQName = new QName(humanTaskDU.getNamespace(), inlineNotification.getName());
        NotificationConfiguration notificationConf = new NotificationConfiguration(inlineNotification, humanTaskDU.getNotificationServiceInfo(notificationQName), humanTaskDU.getHumanInteractionsDefinition(), humanTaskDU.getWSDLs(), humanTaskDU.getNamespace(), humanTaskDU.getName(), getTenantAxisConfig(), humanTaskDU.getPackageName(), humanTaskDU.getVersion(), humanTaskDU.getHumanTaskDefinitionFile());
        notificationConf.setPackageStatus(humanTaskDU.getTaskPackageStatus());
        taskConfigurations.add(notificationConf);
        taskConfigsInPackage.add(notificationConf.getName());
        taskBaseConfigurationHashMap.put(notificationConf.getName(), notificationConf);
        if (notificationConf.getPackageStatus() == TaskPackageStatus.ACTIVE) {
            activeTaskConfigurationQNameMap.put(notificationQName, notificationConf.getName());
        }
    }
    taskConfigurationsInTaskPackage.put(humanTaskDU.getName(), taskConfigsInPackage);
    return taskConfigsInPackage;
}

Example 95 with Condition

use of org.wso2.carbon.apimgt.throttle.policy.deployer.dto.Condition in project carbon-business-process by wso2.

the class IfImpl method getArrows.

/**
 * Get the arrow coordinates of the activities
 *
 * @param doc SVG document which defines the components including shapes, gradients etc. of the activity
 * @return An element which contains the arrow coordinates of the If activity and its subActivities
 */
protected Element getArrows(SVGDocument doc) {
    if (subActivities != null) {
        ActivityInterface prevActivity = null;
        ActivityInterface prevElseActivity = null;
        ActivityInterface activity = null;
        ActivityInterface seqActivity = null;
        boolean throwOrNot = true;
        String id = null;
        // Coordinates of the start icon exit arrow
        SVGCoordinates myStartCoords = getStartIconExitArrowCoords();
        // Coordinates of the end icon entry arrow
        SVGCoordinates myExitCoords = getEndIconEntryArrowCoords();
        // Coordinates of the Else activity start icon entry arrow
        SVGCoordinates myStartElseCoords = getStartIconElseArrowCoords();
        SVGCoordinates exitCoords = null;
        SVGCoordinates activityEntryCoords = null;
        SVGCoordinates activityExitCoords = null;
        Iterator<ActivityInterface> itr = subActivities.iterator();
        Element subGroup = doc.createElementNS(SVGNamespace.SVG_NAMESPACE, "g");
        // Iterates through all the subActivities
        while (itr.hasNext()) {
            activity = itr.next();
            // Gets the entry and exit coordinates of the iterated activity
            activityEntryCoords = activity.getEntryArrowCoords();
            activityExitCoords = activity.getExitArrowCoords();
            // Checks if the iterated activity is an instance of ElseIf or Else activity
            if (activity instanceof ElseIfImpl || activity instanceof ElseImpl) {
                // Checks whether there is a  previous activity and if so whether that activity is an ElseIf
                if (prevActivity != null && prevActivity instanceof ElseIfImpl) {
                    // Get the exit arrow coordinates of the ElseIf activity
                    exitCoords = ((ElseIfInterface) prevActivity).getNextElseExitArrowCoords();
                    // id is assigned with the id of the previous activity + id of the current activity
                    id = prevActivity.getId() + "-" + activity.getId();
                    // Checks whether the activity is an instance of Else
                    if (activity instanceof ElseImpl) {
                        // Gets the boolean value assigned inside ElseImpl when a throw activity is in Else
                        boolean check = ((ElseImpl) activity).throwOrNot;
                        // Define the entry arrow flow coordinates for the activity
                        subGroup.appendChild(getArrowDefinition(doc, exitCoords.getXLeft(), exitCoords.getYTop(), activityEntryCoords.getXLeft() - getEndIconWidth() / 2, exitCoords.getYTop(), id));
                        // If there is a Throw activity inside Else, no exit arrow from Throw activity
                        if (check != true) {
                            subGroup.appendChild(getArrowDefinition(doc, activityExitCoords.getXLeft(), activityExitCoords.getYTop(), myExitCoords.getXLeft(), myExitCoords.getYTop(), id));
                        }
                    } else if (activity instanceof ElseIfImpl) {
                        // Checks whether the activity is an instance of ElseIf
                        // Gets the boolean value assigned inside ElseIfImpl when a throw activity is in ElseIf
                        boolean check = ((ElseIfImpl) activity).throwOrNot;
                        // Define the entry arrow flow coordinates for the activity
                        subGroup.appendChild(getArrowDefinition(doc, exitCoords.getXLeft(), exitCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                        // If there is a Throw activity inside ElseIf, no exit arrow from Throw activity
                        if (check != true) {
                            subGroup.appendChild(getArrowDefinition(doc, activityExitCoords.getXLeft(), activityExitCoords.getYTop(), myExitCoords.getXLeft(), myExitCoords.getYTop(), id));
                        }
                    } else {
                        // Entry and exit arrow flows defined for other activities except for instances of Elseif and
                        // Else
                        subGroup.appendChild(getArrowDefinition(doc, exitCoords.getXLeft(), exitCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                        subGroup.appendChild(getArrowDefinition(doc, activityExitCoords.getXLeft(), activityExitCoords.getYTop(), myExitCoords.getXLeft(), myExitCoords.getYTop(), id));
                    }
                } else if (prevActivity instanceof ThrowImpl && activity instanceof ElseImpl) {
                    // IF conditon fifnished --> ELSE IF ( previous activity is null and its is not an instance of
                    // ElseIf)
                    /*Checks if the previous activity is a Throw and if the current activity an Else, if so no exit
                        arrow flows only entry arrow flows.
                        */
                    subGroup.appendChild(getArrowDefinition(doc, myStartElseCoords.getXLeft(), myStartElseCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                } else if (activity instanceof ElseIfImpl) {
                    // Checks whether the activity is an instance of ElseIf
                    // Gets the boolean value assigned inside ElseIfImpl when a throw activity is in ElseIf
                    boolean check = ((ElseIfImpl) activity).throwOrNot;
                    // Define the entry arrow flow coordinates for the activity
                    subGroup.appendChild(getArrowDefinition(doc, myStartElseCoords.getXLeft(), myStartElseCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                    // If there is a Throw activity inside ElseIf, no exit arrow from Throw activity
                    if (check != true) {
                        subGroup.appendChild(getArrowDefinition(doc, activityExitCoords.getXLeft(), activityExitCoords.getYTop(), myExitCoords.getXLeft(), myExitCoords.getYTop(), id));
                    }
                } else if (activity instanceof ElseImpl) {
                    // Checks whether the activity is an instance of Else
                    // Gets the boolean value assigned inside ElseIfImpl when a throw activity is in Else
                    boolean check = ((ElseImpl) activity).throwOrNot;
                    // Define the entry arrow flow coordinates for the activity
                    subGroup.appendChild(getArrowDefinition(doc, myStartElseCoords.getXLeft(), myStartElseCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                    // If there is a Throw activity inside Else, no exit arrow from Throw activity
                    if (check != true) {
                        subGroup.appendChild(getArrowDefinition(doc, activityExitCoords.getXLeft(), activityExitCoords.getYTop(), myExitCoords.getXLeft(), myExitCoords.getYTop(), id));
                    }
                } else {
                    id = prevActivity.getId() + "-" + activity.getId();
                    // flows
                    if (activity instanceof ThrowImpl) {
                        subGroup.appendChild(getArrowDefinition(doc, myStartElseCoords.getXLeft(), myStartElseCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                    } else {
                        // Define both the entry and the exit arrow flows to the activity
                        subGroup.appendChild(getArrowDefinition(doc, myStartElseCoords.getXLeft(), myStartElseCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                        subGroup.appendChild(getArrowDefinition(doc, activityExitCoords.getXLeft(), activityExitCoords.getYTop(), myExitCoords.getXLeft(), myExitCoords.getYTop(), id));
                    }
                }
            } else if (activity instanceof ThrowImpl) {
                // Checks if the current activity a Throw activity, if so no exit arrow flows only entry arrow flows
                subGroup.appendChild(getArrowDefinition(doc, myStartCoords.getXLeft(), myStartCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
            } else if (activity instanceof SourceImpl || activity instanceof TargetImpl || activity instanceof SourcesImpl || activity instanceof TargetsImpl) {
            // Checks if the current activity a Source/s or Target/s activity, if so no exit or entry arrow flows
            // as no icons are defined
            // No arrow flows for Sources or Targets..
            } else {
                if (prevActivity != null) {
                    // Gets the coordinates of the exit arrows of the previous activity
                    exitCoords = prevActivity.getExitArrowCoords();
                    id = prevActivity.getId() + "-" + activity.getId();
                    // arrow flows as no icons are defined
                    if (prevActivity instanceof SourceImpl || prevActivity instanceof TargetImpl || prevActivity instanceof SourcesImpl || prevActivity instanceof TargetsImpl) {
                    // No arrow flows for Sources or Targets..
                    } else {
                        subGroup.appendChild(getArrowDefinition(doc, exitCoords.getXLeft(), exitCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                    }
                } else {
                    // Checks whether the activity is a Sequence
                    if (activity instanceof SequenceImpl) {
                        List<ActivityInterface> sub = activity.getSubActivities();
                        // Iterates through the subActivities
                        Iterator<ActivityInterface> as = sub.iterator();
                        while (as.hasNext()) {
                            seqActivity = as.next();
                            // Checks if the subActivity is a Throw activity
                            if (seqActivity instanceof ThrowImpl) {
                                throwOrNot = true;
                                // if condition breaks if the subActivity is a Throw activity
                                break;
                            } else {
                                throwOrNot = false;
                            }
                        }
                        // If its a Throw activity , no exit arrow flow only entry arrow flow to the activity
                        if (throwOrNot == true) {
                            subGroup.appendChild(getArrowDefinition(doc, myStartCoords.getXLeft(), myStartCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                        } else {
                            // If not, define both the entry and the exit arrow flows to the activity
                            subGroup.appendChild(getArrowDefinition(doc, myStartCoords.getXLeft(), myStartCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                            subGroup.appendChild(getArrowDefinition(doc, activityExitCoords.getXLeft(), activityExitCoords.getYTop(), myExitCoords.getXLeft(), myExitCoords.getYTop(), id));
                        }
                    } else {
                        // Define both the entry and the exit arrow flows to the activity
                        subGroup.appendChild(getArrowDefinition(doc, myStartCoords.getXLeft(), myStartCoords.getYTop(), activityEntryCoords.getXLeft(), activityEntryCoords.getYTop(), id));
                        subGroup.appendChild(getArrowDefinition(doc, activityExitCoords.getXLeft(), activityExitCoords.getYTop(), myExitCoords.getXLeft(), myExitCoords.getYTop(), id));
                    }
                }
            }
            // current activity is assigned to the previous activity
            prevActivity = activity;
        }
        return subGroup;
    }
    return null;
}