How to use

singleResult

method

in

org.flowable.content.api.ContentItemQuery

  protected ContentItem getContentItemFromRequest(String contentItemId) {
    ContentItem contentItem = contentService.createContentItemQuery().id(contentItemId).singleResult();
    if (contentItem == null) {
      throw new FlowableObjectNotFoundException("Could not find a content item with id '" + contentItemId + "'.", ContentItem.class);
    }
    
    if (restApiInterceptor != null) {
      restApiInterceptor.accessContentItemInfoById(contentItem);
    }
    
    return contentItem;
  }
}

public ContentItemRepresentation getContent(String contentId) {
  ContentItem contentItem = contentService.createContentItemQuery().id(contentId).singleResult();
  if (contentItem == null) {
    throw new NotFoundException("No content found with id: " + contentId);
  }
  if (!permissionService.canDownloadContent(SecurityUtils.getCurrentUserObject(), contentItem)) {
    throw new NotPermittedException("You are not allowed to view the content with id: " + contentId);
  }
  return createContentItemResponse(contentItem);
}

public void getRawContent(String contentId, HttpServletResponse response) {
  ContentItem contentItem = contentService.createContentItemQuery().id(contentId).singleResult();
  if (contentItem == null) {
    throw new NotFoundException("No content found with id: " + contentId);
  }
  if (!contentItem.isContentAvailable()) {
    throw new NotFoundException("Raw content not yet available for id: " + contentId);
  }
  if (!permissionService.canDownloadContent(SecurityUtils.getCurrentUserObject(), contentItem)) {
    throw new NotPermittedException("You are not allowed to read the content with id: " + contentId);
  }
  // Set correct mine-type
  if (contentItem.getMimeType() != null) {
    response.setContentType(contentItem.getMimeType());
  }
  // Write content response
  try (InputStream inputstream = contentService.getContentItemData(contentId)) {
    IOUtils.copy(inputstream, response.getOutputStream());
  } catch (IOException e) {
    throw new InternalServerErrorException("Error while writing raw content data for content: " + contentId, e);
  }
}

public void deleteContent(String contentId, HttpServletResponse response) {
  ContentItem contentItem = contentService.createContentItemQuery().id(contentId).singleResult();
  if (contentItem == null) {
    throw new NotFoundException("No content found with id: " + contentId);
  }
  if (!permissionService.hasWritePermissionOnRelatedContent(SecurityUtils.getCurrentUserObject(), contentItem)) {
    throw new NotPermittedException("You are not allowed to delete the content with id: " + contentId);
  }
  if (contentItem.getField() != null) {
    // Not allowed to delete content that has been added as part of a form
    throw new NotPermittedException("You are not allowed to delete the content with id: " + contentId);
  }
  contentService.deleteContentItem(contentItem.getId());
}