/**
   * @param worker
   * @param connection
   * @throws Exception
   */
  private void createIndex(SearchIndexBuilderWorker worker, Connection connection)
      throws Exception {
    IndexWriter indexWrite = null;
    try {
      if (worker.isRunning()) {
        indexWrite = indexStorage.getIndexWriter(false);
      }
      if (indexWrite != null) {
        Document doc = new Document();
        // The date of indexing
        String timeStamp = String.valueOf(System.currentTimeMillis());
        doc.add(
            new Field(
                SearchService.DATE_STAMP, timeStamp, Field.Store.NO, Field.Index.NOT_ANALYZED));
        doc.add(
            new Field(
                SearchService.DATE_STAMP,
                CompressionTools.compressString(timeStamp),
                Field.Store.YES));

        String ref = "---INDEX-CREATED---";
        doc.add(
            new Field(
                SearchService.FIELD_REFERENCE,
                CompressionTools.compressString(ref),
                Field.Store.YES));
        doc.add(
            new Field(
                SearchService.FIELD_REFERENCE, ref, Field.Store.NO, Field.Index.NOT_ANALYZED));

        indexWrite.addDocument(doc);
      } else {
        log.error("Couldn't get indexWriter to add document!");
      }

    } catch (Exception ex) {
      log.error("Failed to Add Documents ", ex);
      throw new Exception(ex);
    } finally {
      if (indexWrite != null) {
        if (log.isDebugEnabled()) {
          log.debug("Closing Index Writer With " + indexWrite.maxDoc() + " documents");
          Directory d = indexWrite.getDirectory();
          String[] s = d.listAll();
          log.debug("Directory Contains ");
          for (int i = 0; i < s.length; i++) {
            File f = new File(s[i]);
            log.debug(
                "\t"
                    + String.valueOf(f.length())
                    + "\t"
                    + new Date(f.lastModified())
                    + "\t"
                    + s[i]);
          }
        }
        indexStorage.closeIndexWriter(indexWrite);
      }
    }
  }
  private void processAdd(
      SearchIndexBuilderWorker worker, Connection connection, List<SearchBuilderItem> runtimeToDo)
      throws Exception {
    IndexWriter indexWrite = null;
    try {
      if (worker.isRunning()) {
        indexWrite = indexStorage.getIndexWriter(false);
      }
      long last = System.currentTimeMillis();

      for (Iterator<SearchBuilderItem> tditer = runtimeToDo.iterator();
          worker.isRunning() && tditer.hasNext(); ) {

        Reader contentReader = null;
        try {
          SearchBuilderItem sbi = (SearchBuilderItem) tditer.next();
          // only add adds, that have been deleted or are locked
          // sucessfully
          if (!SearchBuilderItem.STATE_PENDING_2.equals(sbi.getSearchstate())
              && !SearchBuilderItem.STATE_LOCKED.equals(sbi.getSearchstate())) {
            continue;
          }
          // Reference ref =
          // entityManager.newReference(sbi.getName());
          String ref = sbi.getName();
          if (ref == null) {
            log.error(
                "Unrecognised trigger object presented to index builder " //$NON-NLS-1$
                    + sbi);
          }

          long startDocIndex = System.currentTimeMillis();
          worker.setStartDocIndex(startDocIndex);
          worker.setNowIndexing(ref);

          try {
            try {
              // Entity entity = ref.getEntity();
              EntityContentProducer sep = searchIndexBuilder.newEntityContentProducer(ref);
              boolean indexDoc = true;
              if (searchIndexBuilder.isOnlyIndexSearchToolSites()) {
                try {
                  String siteId = sep.getSiteId(sbi.getName());
                  Site s = SiteService.getSite(siteId);
                  ToolConfiguration t = s.getToolForCommonId("sakai.search"); // $NON-NLS-1$
                  if (t == null) {
                    indexDoc = false;
                    log.debug(
                        "Not indexing " //$NON-NLS-1$
                            + sbi.getName()
                            + " as it has no search tool"); //$NON-NLS-1$
                  }
                } catch (Exception ex) {
                  indexDoc = false;
                  log.debug(
                      "Not indexing  "
                          + sbi.getName() // $NON-NLS-1$
                          + " as it has no site",
                      ex); //$NON-NLS-1$
                }
              }
              if (indexDoc && sep != null && sep.isForIndex(ref) && sep.getSiteId(ref) != null) {

                DigestStorageUtil digestStorageUtil = new DigestStorageUtil(searchService);
                // Reader contentReader = null;
                Document doc =
                    DocumentIndexingUtils.createIndexDocument(
                        ref,
                        digestStorageUtil,
                        sep,
                        serverConfigurationService.getServerUrl(),
                        contentReader);
                // indexDocTMP(ref, sep);

                log.debug("Indexing Document " + doc); // $NON-NLS-1$

                indexWrite.addDocument(doc);

                log.debug("Done Indexing Document " + doc); // $NON-NLS-1$

                processRDF(ref, sep);

              } else {
                if (log.isDebugEnabled()) {
                  if (!indexDoc) {
                    log.debug("Ignored Document: Fileteed out by site " + ref); // $NON-NLS-1$
                  } else if (sep == null) {
                    log.debug("Ignored Document: No EntityContentProducer " + ref); // $NON-NLS-1$

                  } else if (!sep.isForIndex(ref)) {
                    log.debug("Ignored Document: Marked as Ignore " + ref); // $NON-NLS-1$

                  } else if (sep.getSiteId(ref) == null) {
                    log.debug("Ignored Document: No Site ID " + ref); // $NON-NLS-1$

                  } else {
                    log.debug("Ignored Document: Reason Unknown " + ref); // $NON-NLS-1$
                  }
                }
              }
            } catch (Exception e1) {
              log.debug(
                  " Failed to index document for "
                      + ref
                      + " cause: " //$NON-NLS-1$
                      + e1.getMessage(),
                  e1);
            }
            sbi.setSearchstate(SearchBuilderItem.STATE_COMPLETED);
            updateOrSave(connection, sbi);

          } catch (Exception e1) {
            log.debug(
                " Failed to index document cause: " //$NON-NLS-1$
                    + e1.getMessage());
          }
          long endDocIndex = System.currentTimeMillis();
          worker.setLastIndex(endDocIndex - startDocIndex);
          if ((endDocIndex - startDocIndex) > 60000L) {
            log.warn(
                "Slow index operation " //$NON-NLS-1$
                    + String.valueOf((endDocIndex - startDocIndex) / 1000)
                    + " seconds to index " //$NON-NLS-1$
                    + ref);
          }
          // update this node lock to indicate its
          // still alove, no document should
          // take more than 2 mins to process
          // ony do this check once every minute
          long now = System.currentTimeMillis();
          if ((now - last) > (60L * 1000L)) {
            last = System.currentTimeMillis();
            if (!worker.getLockTransaction(15L * 60L * 1000L, true)) {
              throw new Exception(
                  "Transaction Lock Expired while indexing " //$NON-NLS-1$
                      + ref);
            }
          }

        } finally {
          if (contentReader != null) {
            try {
              contentReader.close();
            } catch (IOException ioex) {
              log.debug(ioex);
            }
          }
        }
      }
      worker.setStartDocIndex(System.currentTimeMillis());
      worker.setNowIndexing(
          Messages.getString("SearchIndexBuilderWorkerDaoJdbcImpl.33")); // $NON-NLS-1$
    } catch (Exception ex) {
      log.error("Failed to Add Documents ", ex);
      throw new Exception(ex);
    } finally {
      if (indexWrite != null) {
        if (log.isDebugEnabled()) {
          log.debug("Closing Index Writer With " + indexWrite.maxDoc() + " documents");
          Directory d = indexWrite.getDirectory();
          String[] s = d.listAll();
          log.debug("Directory Contains ");
          for (int i = 0; i < s.length; i++) {
            File f = new File(s[i]);
            log.debug(
                "\t"
                    + String.valueOf(f.length())
                    + "\t"
                    + new Date(f.lastModified())
                    + "\t"
                    + s[i]);
          }
        }
        indexStorage.closeIndexWriter(indexWrite);
      }
    }
  }