OnlyChildPublicationResolver.cs

/// <summary>
/// Resolver to strip out items from parent publication
/// </summary>
public class OnlyChildPublicationsResolver : IResolver
{
    /// <summary>
    /// For publish and unpublish, remove all items from the parent publication from the list.
    /// </summary>
    /// <param name="item">Item to be resolved (e.g. a page, structure group, template)</param>
    /// <param name="instruction">Resolve instruction</param>
    /// <param name="context">Publish context</param>
    /// <param name="resolvedItems">List of items that are currently to be rendered and published (added by previous resolvers in the chain)</param>
    public void Resolve(IdentifiableObject item, ResolveInstruction instruction, PublishContext context, Tridion.Collections.ISet resolvedItems)
    {
        List itemsToRemove = new List();
        StringBuilder infoMessage = new StringBuilder();
        infoMessage.AppendLine(string.Format("Removed the following items from a {0} transaction to {1}:", instruction.Purpose, context.PublicationTarget.Title));

        // parent publication id (should come from a configuration)
        TcmUri parentPublicationUri = new TcmUri("tcm:0-2-1");

        // check for items from parent publication (these do not need to be published or unpublished)
        foreach (ResolvedItem resolvedItem in resolvedItems)
        {
            // mark all items from parent publication for removal
            if (resolvedItem.Item.Id.PublicationId == parentPublicationUri.ItemId)
            {
                itemsToRemove.Add(resolvedItem);
            }
        }

        // remove all items that we need to discard
        foreach (ResolvedItem itemToRemove in itemsToRemove)
        {
            infoMessage.AppendLine(string.Format("{0}: {1} ({2})", itemToRemove.Item.Id.ItemType, itemToRemove.Item.Title, itemToRemove.Item.Id));
            resolvedItems.Remove(itemToRemove);
        }

        // log info mesage about which items have been removed
        if (itemsToRemove.Count > 0)
        {
            Logger.Write(infoMessage.ToString(), "OnlyChildPublicationsResolver", LoggingCategory.General, TraceEventType.Information);
        }
    }
}