HistoricVariableInstanceQuery query = historyService.createHistoricVariableInstanceQuery();
// Populate query based on request
if(queryRequest.getExcludeTaskVariables() != null) {
if (queryRequest.getExcludeTaskVariables()) {
query.excludeTaskVariables();
}
}
if (queryRequest.getTaskId() != null) {
query.taskId(queryRequest.getTaskId());