Updating Folders

The Documents and Media API lets you copy or move folders to a different location. Options for in-place folder updates, however, are limited. You can only update a folder’s name and description. You can do this with the DLAppService method updateFolder:

updateFolder(long folderId, String name, String description, ServiceContext serviceContext)

All parameters except the description are mandatory. For a full description of this method and its parameters, see its Javadoc.

Follow these steps to use this method to update a folder:

  1. Get a reference to DLAppService:

    private DLAppService _dlAppService;

    For more information on this, see the section on getting a service reference in the getting started tutorial.

  2. Get the data needed to populate the updateFolder method’s arguments. Since it’s common to update a folder with data submitted by the end user, you can extract the data from the request. This example does so via javax.portlet.ActionRequest and ParamUtil, but you can get the data any way you wish:

    long folderId = ParamUtil.getLong(actionRequest, "folderId");
    String name = ParamUtil.getString(actionRequest, "name");
    String description = ParamUtil.getString(actionRequest, "description");
    ServiceContext serviceContext = ServiceContextFactory.getInstance(
                DLFolder.class.getName(), actionRequest);

    For more information on getting folder IDs, see the getting started tutorial’s section on specifying folders. For more information on ServiceContext, see the tutorial Understanding ServiceContext.

  3. Call the service reference’s updateFolder method with the data from the previous step:

    _dlAppService.updateFolder(folderId, name, description, serviceContext);

You can find the full code for this example in the updateFolder method of Liferay DXP’s EditFolderMVCActionCommand class. This class uses the Documents and Media API to implement almost all the Folder actions that the Documents and Media app supports. Also note that this updateFolder method, as well as the rest of EditFolderMVCActionCommand, contains additional logic to suit the specific needs of the Documents and Media app.

Creating Folders

Deleting Folders

Copying Folders

Moving Folders and Files

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