package webraveler.plugin;

import java.util.*;

import webraveler.html.HTMLPage2;
import webraveler.http.HTTPRequest;
import webraveler.http.HTTPResponse;
import webraveler.ravel.PluginAPI;
import webraveler.vurl.PluginChangePref;
import webraveler.vurl.PluginConfig;

/**
 *
 * A quick demo of linking to the instructor's home.
 *
 **/

public class LinkToSamPlugin extends webraveler.ravel.RavelerPlugin {
	/* variables */
	
	/*constructors*/
	public LinkToSamPlugin () {
		name = "LinkToSamPlugin";
		mimeTypes.add("text/html");
	}
	
	/*methods*/
	
	public void setDefaultAttributes () {
		attributes = new Hashtable();
		attributes.put("InsertHtml","<p>Return to <a href=\"http://www.cs.grinnell.edu/\">the course home</a>.</p>");
	} 
	
	public boolean initialize () {
		String fullURL;
		Vector attributes = new Vector();
		attributes.add("InsertHtml");
		PluginChangePref changePref = new webraveler.vurl.PluginChangePref("LinkToSamPlugin");
		fullURL = PluginAPI.addPermanentVirtualURL(ravel,name,"changePref",changePref);
		PluginConfig config = new PluginConfig("LinkToSamPlugin",attributes,fullURL);
		fullURL = PluginAPI.addConfigVirtualURL(ravel,name,config);
		return true;
	}//initialize()
	
	public HTTPRequest execute (HTTPRequest request, Hashtable attributes) {
		return request;
	}//execute()
	
	
	
	public HTTPResponse execute (HTTPResponse response, Hashtable attributes){
		System.out.println("Executing LinkToSamPlugin: ");
		
		String InsertHtml = (String) attributes.get("InsertHtml");
		System.out.println("LinkToSamPlugin: InsertHtml = '"+InsertHtml+"'");
		
		response.getHtmlPage().insertAtTop(InsertHtml);
		
		/* Change the entityBytes of the passed HTTPResponse to the HTML page w/inserted text
		 * at the top */
		response.correctContentLength();
		
		System.out.println("LinkToSamPlugin: DONE");
		return response;
	} //execute(HTTPResponse)
	
	
	public  void terminate() {
		
	} // terminate()
	
	
}// LinkToSamPlugin