Access container page of a component in .net based CT

Question

We are developing a .net based CT based on Broker query Mechanism (filter):

ComponentPresentationAssembler  cpAssembler = new ComponentPresentationAssembler(Page ID,Page object);

In order to pass the page ID, I need to get the access of page on which the component is present. How can I access the page from package? Since this a CT, a component object would be available in page and not a page object. Tried the following piece of code, but without success:

string pageURI = _package.GetValue("Page.ID");
Page objPage = (Page)_engine.GetSession().GetObject(pageURI);

This is not working as there is no page object. What are the alternatives so that we can access the parent page of component from CT?

Answer 1

To address this I created an AddPageToComponentPresentation TBB. Here's the code:

using System;
using System.Collections.Generic;
using System.Text;

using Tridion.ContentManager;
using Tridion.ContentManager.Templating;
using Tridion.ContentManager.Templating.Assembly;

namespace Tridion.Extensions.ContentManager.Templating {
    [TcmTemplateTitle("Add Page To ComponentPresentation")]
    class AddPageToComponentPresentation : TemplateBase {
        public override void Transform(Engine engine, Package package) {
            if (engine.PublishingContext.RenderContext.ContextItem != null) {
                Item pageItem = package.CreateTridionItem(ContentType.Page, engine.PublishingContext.RenderContext.ContextItem.Id);
                package.PushItem("Page", pageItem);
                Logger.Debug("Page Item added to Package");
            } else {
                Logger.Debug("No Context Item found");
            }
        }
    }
}

Answer 2

Thanks a lot Jeremy. I tried this code, but was not able to use the interface TemplateBase

With hints from your code, I tried

Page page = _engine.PublishingContext.RenderContext.ContextItem as Page;

and this worked well. Also I could get publication object as:

Publication pub = (Publication)page.ContextRepository;

Thank you very much.