/* this belongs to the WebRaveler package */
package webraveler.vurl;

import java.util.*;


import webraveler.http.HTTPRequest;
import webraveler.http.HTTPResponse;
import webraveler.ravel.Raveler;
/**
 * A VURL that displays the errors and warnings reported while raveling a page
 *
 * @author The Web Raveler Development Squad
 * @version 1.0
 */
public class ErrorsVURL implements VURL {
   Hashtable errors;
   Hashtable warnings;
   
	/**
	 * Contructs a VURL with an empty page
	 */
	public ErrorsVURL () {
		errors = new Hashtable();
		warnings = new Hashtable();
	} // ErrorsVURL()

	/**
	 *
	 */

	public HTTPResponse resolveVURL(String username, String query, HTTPRequest request,Raveler ravel) {
		String responseString = "<html><head>"+Raveler.ravelerCSS+"</head><body>";
		responseString += "<p class='level1'>Raveled page: "+query+"</p>";
		/* Check if errors occurred */
		if (errors.containsKey(query)) {
			/* Display the errors */
			responseString += "<p class='level2'>Errors</p>";
			String err = (String) errors.get(query);
			responseString += err;
		} //if
		/* Check if warnings occurred */
		else if (warnings.containsKey(query)) {  
			/* Display the warnings */
			responseString += "<p class='level2'>Warnings</p>";
			String warn = (String) warnings.get(query);
			responseString += warn;
		} //else if
		/* Otherwise, display a message reporting that no errors/warnings occurred */
		else
			responseString += "<p class='level4'>No errors or warnings were reported.</p>";

		return new HTTPResponse("HTTP/1.0",200,"OK",responseString.getBytes(),new Hashtable());
	} // resolveVURL

	/**
	 * Adds an error message
	 *
	 * @param error A string containing the error message to display
   	 * @param url A string containing the url where the error occurred
	 */
	public void addError (String error, String url) {
		if (errors.containsKey(url)) {
			/* Add the error message to error string */
			String err = (String) errors.get(url);
			err += error;
			errors.put(url,err);
		} //if
		else {
			/* Add an entry in the hash table for the url */
			errors.put(url,error);
		} //else
	} //addError(String,String)

	/**
	 * Adds an warning message
	 *
	 * @param warning A string containing the error message to display
   	 * @param url A string containing the url where the error occurred
	 */
	public void addWarning (String warning, String url) {
		if (warnings.containsKey(url)) {
			/* Add the error message to error string */
			String warn = (String) warnings.get(url);
			warn += warning;
			warnings.put(url,warn);
		} //if
		else {
			/* Add an entry in the hash table for the url */
			warnings.put(url,warning);
		} //else
	} //addError(String,String)

} // class ErrorsVURL