package at.gv.egovernment.moa.id.auth.parser;

import java.io.ByteArrayInputStream;
import java.io.InputStream;

import org.w3c.dom.Element;

import at.gv.egovernment.moa.id.ParseException;
import at.gv.egovernment.moa.util.Constants;
import at.gv.egovernment.moa.util.DOMUtils;
import at.gv.egovernment.moa.util.XPathUtils;

/**
 * Parses an <code>&lt;InfoboxReadResponse&gt;</code>.
 * 
 * @author Stefan Knirsch
 * @version $Id$
 */

public class ErrorResponseParser {
  //
  // XPath namespace prefix shortcuts
  //
  /** Xpath prefix for reaching SecurityLayer 1.0 Namespaces */
  private static final String SL10 = Constants.SL10_PREFIX + ":";
  /** Xpath expression to the root element */
  private static final String ROOT = "/" + SL10 + "ErrorResponse/";
  /** Xpath expression to the ErrorCode element */
  private static final String ERROR_CODE_XPATH = 
      ROOT + SL10 + "ErrorCode";
  /** Xpath expression to the Info element */
  private static final String ERROR_INFO_XPATH = 
      ROOT + SL10 + "Info";


  /** This is the root element of the XML-Document provided by the Security Layer Card */
  private Element errorElement;

  /**
   * Constructor for InfoboxReadResponseParser.
   * A DOM-representation of the incoming String will be created
   * @param xmlResponse <code>&lt;InfoboxReadResponse&gt;</code> as String
   * @throws ParseException on any error
   */
  public ErrorResponseParser(String xmlResponse) throws ParseException {
    try {
      InputStream s = new ByteArrayInputStream(xmlResponse.getBytes("UTF-8"));
      errorElement = DOMUtils.parseXmlValidating(s);
    }
    catch (Throwable t) {
      throw new ParseException("parser.01", new Object[] { t.toString()}, t);
    }
  }

  /**
   * Constructor for InfoboxReadResponseParser.
   * A DOM-representation of the incoming Inputstream will be created
   * @param xmlResponse <code>&lt;InfoboxReadResponse&gt;</code> as InputStream
   * @throws ParseException on any error
   */
  public ErrorResponseParser(InputStream xmlResponse) throws ParseException {
    try {
      errorElement = DOMUtils.parseXmlValidating(xmlResponse);
    }
    catch (Throwable t) {
      throw new ParseException("parser.01", new Object[] { t.toString() }, t);
    }
  }

  /**
   * Method getErrorCode. returns the error code
   * @return String
   */
  public String getErrorCode() {
   
   return XPathUtils.getElementValue(errorElement,ERROR_CODE_XPATH,null); 
  }		

  /**
   * Method getErrorInfo: returns the information about the error
   * @return String
   */
  public String getErrorInfo() {
   
   return XPathUtils.getElementValue(errorElement,ERROR_INFO_XPATH,null); 
  }   


}