A DD4T.net Implementation - Custom Binary Publisher (part 2)

In previous post Custom Binary Publisher, I presented the main logic needed to publish our Multimedia Components using custom code in DD4T .net. In this post, I present the Template Building Blocks (TBB) that call the custom binary publisher.

If you take a closer look at the code, you will notice it is basically the same code as the existing TBBs PublishBinariesComponent and PublishBinariesPage. I just created a separate PublishBinariesHelper class that uses the CustomBinaryPublisher described earlier. Calling methods PublishMultimediaComponent and PublishBinariesInRichTextField will call the overridden method PublishItem.

public class PublishBinariesHelper
{
    private readonly CustomBinaryPublisher binaryPublisher;

    public PublishBinariesHelper(Package package, Engine engine)
    {
        binaryPublisher = new CustomBinaryPublisher(package, engine);
    }

    public void PublishAllBinaries(Component component)
    {
        if (component.ComponentType == ComponentType.Multimedia)
        {
            component.Multimedia.Url = binaryPublisher.PublishMultimediaComponent(component.Id);
        }

        PublishAllBinaries(component.Fields);
        PublishAllBinaries(component.MetadataFields);
    }

    public void PublishAllBinaries(Page page)
    {
        PublishAllBinaries(page.MetadataFields);
    }

    private void PublishAllBinaries(FieldSet fieldSet)
    {
        foreach (IField field in fieldSet.Values)
        {
            switch (field.FieldType)
            {
                case FieldType.ComponentLink:
                case FieldType.MultiMediaLink:
                    foreach (IComponent component in field.LinkedComponentValues)
                    {
                        PublishAllBinaries(component as Component);
                    }
                    break;

                case FieldType.Embedded:
                    foreach (FieldSet embeddedSet in field.EmbeddedValues)
                    {
                        PublishAllBinaries(embeddedSet);
                    }
                    break;

                case FieldType.Xhtml:
                    for (int i = 0; i < field.Values.Count; i++)
                    {
                        field.Values[i] = binaryPublisher.PublishBinariesInRichTextField(field.Values[i]);
                    }
                    break;
            }
        }
    }
}

Next, we create the actual TBB classes that use the PublishBinariesHelper -- CustomPublishBinariesComponent and CustomPublishBinariesPage, which extend their DD4T counterparts PublishBinariesComponent and PublishBinariesPage.

public class CustomPublishBinariesComponent : PublishBinariesComponent
{
    protected override void TransformComponent(Component component)
    {
        PublishBinariesHelper helper = new PublishBinariesHelper(Package, Engine);
        helper.PublishAllBinaries(component);
    }
}

public class CustomPublishBinariesPage : PublishBinariesPage
{
    protected override void TransformPage(Page page)
    {
        PublishBinariesHelper helper = new PublishBinariesHelper(Package, Engine);
        helper.PublishAllBinaries(page);
    }
}

Finally, use the custom TBB classes in your Component Template and Page Template, instead of the default DD4T PublishBinariesComponent and PublishBinariesPage TBBs.