/**
   * Get the names of all properties for this resource. This implementation reads all the properties
   * and then extracts their names.
   *
   * @return a MultiStatus of PropertyResponses (PropertyValue.value is always null,
   *     PropertyValue.status contains the status)
   * @exception com.ibm.webdav.WebDAVException
   */
  public MultiStatus getPropertyNames() throws WebDAVException {
    MultiStatus multiStatus = resource.getProperties(resource.getContext());
    Enumeration responses = multiStatus.getResponses();

    // we have the result, but all of the properties in our structure contain
    //    values.  We don't want to include values.  Just names.  The following
    //    code strips out the content of these elements.
    while (responses.hasMoreElements()) {
      PropertyResponse response = (PropertyResponse) responses.nextElement();
      Dictionary properties = response.getPropertiesByPropName();
      Enumeration keys = properties.keys();

      while (keys.hasMoreElements()) {
        PropertyName key = (PropertyName) keys.nextElement();
        Element value = (Element) response.getProperty(key).getValue();
        response.setProperty(
            key, new PropertyValue((Element) value.cloneNode(false), WebDAVStatus.SC_OK));
      }
    }

    return multiStatus;
  }
  /**
   * Edit the properties of a resource. The updates must refer to a Document containing a WebDAV
   * propertyupdates element as the document root.
   *
   * @param updates an XML Document containing propertyupdate elements
   * @return the result of making the updates describing the edits to be made.
   * @exception com.ibm.webdav.WebDAVException
   */
  public MultiStatus setProperties(Document propertyUpdates) throws WebDAVException {
    // create a MultiStatus to hold the results. It will hold a MethodResponse
    // for each update, and one for the method as a whole
    MultiStatus multiStatus = new MultiStatus();
    boolean errorsOccurred = false;

    // first, load the properties so they can be edited
    Document propertiesDocument = resource.loadProperties();
    Element properties = (Element) propertiesDocument.getDocumentElement();

    // be sure the updates have at least one update
    Element propertyupdate = (Element) propertyUpdates.getDocumentElement();
    String tagName = propertyupdate.getNamespaceURI() + propertyupdate.getLocalName();

    if (!tagName.equals("DAV:propertyupdate")) {
      throw new WebDAVException(
          WebDAVStatus.SC_UNPROCESSABLE_ENTITY, "missing propertyupdate element");
    }

    NodeList updates = propertyupdate.getChildNodes();

    if (updates.getLength() == 0) {
      throw new WebDAVException(WebDAVStatus.SC_UNPROCESSABLE_ENTITY, "no updates in request");
    }

    Vector propsGood = new Vector(); // a list of properties that

    // were patched correctly or would have been if another
    // property hadn't gone bad.
    // apply the updates
    Node temp = null;

    for (int i = 0; i < updates.getLength(); i++) {
      temp = updates.item(i);

      // skip any ignorable TXText elements
      if (!(temp.getNodeType() == Node.ELEMENT_NODE)) {
        continue;
      }

      Element update = (Element) temp;
      int updateCommand = -1;
      tagName = update.getNamespaceURI() + update.getLocalName();

      if (tagName.equals("DAV:set")) {
        updateCommand = set;
      } else if (tagName.equals("DAV:remove")) {
        updateCommand = remove;
      } else {
        throw new WebDAVException(
            WebDAVStatus.SC_UNPROCESSABLE_ENTITY,
            update.getTagName() + " is not a valid property update request");
      }

      // iterate through the props in the set or remove element and update the
      // properties as directed
      Element prop = (Element) update.getElementsByTagNameNS("DAV:", "prop").item(0);

      if (prop == null) {
        throw new WebDAVException(
            WebDAVStatus.SC_UNPROCESSABLE_ENTITY, "no propeprties in update request");
      }

      NodeList propsToUpdate = prop.getChildNodes();

      for (int j = 0; j < propsToUpdate.getLength(); j++) {
        temp = propsToUpdate.item(j);

        // skip any TXText elements??
        if (!(temp.getNodeType() == Node.ELEMENT_NODE)) {
          continue;
        }

        Element propToUpdate = (Element) temp;

        // find the property in the properties element
        Element property = null;
        PropertyName propertyName = new PropertyName(propToUpdate);

        if (((Element) propToUpdate).getNamespaceURI() != null) {
          property =
              (Element)
                  properties
                      .getElementsByTagNameNS(
                          propToUpdate.getNamespaceURI(), propToUpdate.getLocalName())
                      .item(0);
        } else {
          property = (Element) properties.getElementsByTagName(propToUpdate.getTagName()).item(0);
        }

        boolean liveone = isLive(propertyName.asExpandedString());

        if (liveone) {
          errorsOccurred = true;

          PropertyResponse response = new PropertyResponse(resource.getURL().toString());
          response.addProperty(propertyName, propToUpdate, WebDAVStatus.SC_FORBIDDEN);
          multiStatus.addResponse(response);
        }

        // do the update
        if (updateCommand == set) {
          if (property != null) {
            try {
              properties.removeChild(property);
            } catch (DOMException exc) {
            }
          }

          if (!liveone) {
            // I don't think we're allowed to update live properties
            //    here.  Doing so effects the cache.  A case in
            //    point is the lockdiscoveryproperty.  properties
            //    is actually the properites cache "document" of this
            //    resource.  Even though we don't "save" the request
            //    if it includes live properties, we don't remove
            //    it from the cache after we'd set it here, so it
            //    can affect other queries. (jlc 991002)
            properties.appendChild(propertiesDocument.importNode(propToUpdate, true));

            propsGood.addElement(propToUpdate);
          }
        } else if (updateCommand == remove) {
          try {
            if (property != null) {
              properties.removeChild(property);
              propsGood.addElement(propToUpdate);
            }
          } catch (DOMException exc) {
          }
        }
      }
    }

    {
      Enumeration els = propsGood.elements();

      for (; els.hasMoreElements(); ) {
        Object ob1 = els.nextElement();
        Element elProp = (Element) ob1;
        PropertyName pn = new PropertyName(elProp);
        PropertyResponse response = new PropertyResponse(resource.getURL().toString());
        response.addProperty(
            pn,
            (Element) elProp.cloneNode(false),
            (errorsOccurred ? WebDAVStatus.SC_FAILED_DEPENDENCY : WebDAVStatus.SC_OK));

        // todo: add code for responsedescription
        multiStatus.addResponse(response);
      }
    }

    // write out the properties
    if (!errorsOccurred) {
      resource.saveProperties(propertiesDocument);
    }

    return multiStatus;
  }