package at.gv.egovernment.moa.spss.server.service;

import java.io.ByteArrayInputStream;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import at.gv.egovernment.moa.util.Constants;
import at.gv.egovernment.moa.util.DOMUtils;

import at.gv.egovernment.moa.spss.MOAApplicationException;

/**
 * Helper methods for the Service classes.
 * 
 * @author Patrick Peck
 * @version $Id$
 */
public class ServiceUtils {

  /**
   * Schema-validate a request.
   * 
   * @param request The request to validate.
   * @throws MOAApplicationException An error occurred validating the requst.
   */
  public static void validateRequest(Element[] request)
    throws MOAApplicationException {

    // validate the request
    try {
      DOMUtils.validateElement(
        request[0],
        Constants.ALL_SCHEMA_LOCATIONS,
        null);
    } catch (Exception e) {
      throw new MOAApplicationException(
        "1100",
        new Object[] { e.getMessage()},
        e);
    }
  }

  /**
   * Reparse the request with schema-validation turned on so that ID references
   * are resolved.
   * 
   * @param request The request to reparse.
   * @return The reparsed request.
   * @throws MOAApplicationException An error occurred parsing the request.
   */
  public static Element reparseRequest(Element request)
    throws MOAApplicationException {

    try {
      byte[] requestBytes = DOMUtils.serializeNode(request, "UTF-8");
      Document validatedRequest =
        DOMUtils.parseDocument(
          new ByteArrayInputStream(requestBytes),
          true,
          Constants.ALL_SCHEMA_LOCATIONS,
          null);
      return validatedRequest.getDocumentElement();
    } catch (Exception e) {
      throw new MOAApplicationException(
        "1100",
        new Object[] { e.getMessage()},
        e);
    }
  }

}