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Event System to Create Mapped Structure Groups for Binary Publish

As a continuation of last week's Publish Binaries to Mapped Structure Group, this week's TBB is in fact the Event System part of that solution. Make sure you do check out the previous post first, which explains why and what this Event System does.

To reiterate, the Event System intercepts a Multimedia Component save, take its Folder path and create a 1-to-1 mapping of Structure Groups.

The original code was written, again, by my colleague Eric Huiza:

[TcmExtension("MyEvents")]
public class EventsManager : TcmExtension {

    private Configuration configuration;
    private readonly Regex SAFE_DIRNAME_REGEX = new Regex(@"[\W_]+");

    public EventsManager() {
        ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap();
        fileMap.ExeConfigFilename = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + "\\EventSystem.config";
        configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);

        EventSystem.Subscribe<Component, SaveEventArgs>(OnComponentSaveCommitted, EventPhases.TransactionCommitted);
    }

    private void OnComponentSaveCommitted(Component component, SaveEventArgs args, EventPhases phases) {
        if (component.ComponentType == ComponentType.Multimedia) {
            Session session = component.Session;

            TcmUri rootFolderUri = new TcmUri(configuration.AppSettings.Settings["rootBinariesFolderId"].Value);
            TcmUri rootStructureGroupUri = new TcmUri(configuration.AppSettings.Settings["rootBinariesStructureGroupId"].Value);

            Stack<string> structureGroupNames = new Stack<string>();
            PopulateStructureGroupToBeCreated(component.OrganizationalItem, rootFolderUri, structureGroupNames);

            StructureGroup rootStructureGroup = new StructureGroup(rootStructureGroupUri, session);
            OrganizationalItemItemsFilter structoreGroupsFilter = new OrganizationalItemItemsFilter(session);
            structoreGroupsFilter.Recursive = false;
            structoreGroupsFilter.ItemTypes = new Tridion.ContentManager.ItemType[] { Tridion.ContentManager.ItemType.StructureGroup };

            while (structureGroupNames.Count > 0) {
                string structureGroupName = structureGroupNames.Pop();
                IEnumerable<StructureGroup> childStructureGroups = rootStructureGroup.GetItems(structoreGroupsFilter).Cast<StructureGroup>().Where(w => w.Title.Equals(structureGroupName));

                StructureGroup childStructureGroup;
                if (childStructureGroups.Count<StructureGroup>() == 0) {
                    childStructureGroup = CreateStructureGroup(structureGroupName, rootStructureGroup, session);
                } else {
                    childStructureGroup = childStructureGroups.First<StructureGroup>();
                }
                rootStructureGroup = childStructureGroup;
            }
        }
    }

    private void PopulateStructureGroupToBeCreated(OrganizationalItem folder, TcmUri rootFolderId, Stack<string> structureGroupNames) {
        if (folder != null && folder.Id != rootFolderId) {
            structureGroupNames.Push(folder.Title);
            PopulateStructureGroupToBeCreated(folder.OrganizationalItem, rootFolderId, structureGroupNames);
        }
    }

    private StructureGroup CreateStructureGroup(string structureGroupName, StructureGroup parentStructureGroup, Session session) {
        StructureGroup sg = new StructureGroup(session, parentStructureGroup.Id);
        sg.Title = structureGroupName;
        sg.Directory = SAFE_DIRNAME_REGEX.Replace(structureGroupName, "-");
        sg.Save();

        return sg;
    }
}

The configuration file should look like this:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <appSettings>
        <add key="rootBinariesFolderId" value="tcm:1-2-2" />
        <add key="rootBinariesStructureGroupId" value="tcm:1-3-4" />
    </appSettings>
</configuration>


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