content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (https://www.alkacon.com)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * Lesser General Public License for more details.
   *
   * For further information about Alkacon Software GmbH & Co. KG, please see the
   * company website: https://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: https://www.opencms.org
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.opencms.search.extractors;
  
  import org.opencms.xml.CmsXmlGenericWrapper;
  
  import java.io.InputStream;
  import java.util.Iterator;
  import java.util.List;
  import java.util.zip.ZipEntry;
  import java.util.zip.ZipInputStream;
  
  import org.dom4j.Document;
  import org.dom4j.Node;
  import org.dom4j.io.SAXReader;
  
  /**
   * Extracts the text from OpenOffice documents (.ods, .odf).<p>
   *
   * @since 7.0.4
   */
  public final class CmsExtractorOpenOffice extends A_CmsTextExtractor {
  
      /** Static member instance of the extractor. */
      private static final CmsExtractorOpenOffice INSTANCE = new CmsExtractorOpenOffice();
  
      /**
       * Hide the public constructor.<p>
       */
      private CmsExtractorOpenOffice() {
  
          // noop
      }
  
      /**
       * Returns an instance of this text extractor.<p>
       *
       * @return an instance of this text extractor
       */
      public static I_CmsTextExtractor getExtractor() {
  
          return INSTANCE;
      }
  
      /**
       * @see org.opencms.search.extractors.A_CmsTextExtractor#extractText(java.io.InputStream, java.lang.String)
       */
      @Override
      public I_CmsExtractionResult extractText(InputStream in, String encoding) throws Exception {
  
          try (ZipInputStream zin = new ZipInputStream(in)) {
              ZipEntry ze;
              boolean FOUND_CONTENT = false;
              String result = "";
              while (!FOUND_CONTENT) {
                  ze = zin.getNextEntry();
                  FOUND_CONTENT = ze.getName().equalsIgnoreCase("content.xml");
                  if (FOUND_CONTENT) {
                      result = readContent(zin);
                  }
              }
              result = removeControlChars(result);
              return new CmsExtractionResult(result);
          }
      }
  
      /**
       * Internal routine that parses the specific content.xml part of
       * an odf document.<p>
       *
       * @param in the input stream spooled to the start of the content.xml part
       *
       * @return the extracted content
       *
       * @throws Exception if sth goes wrong
       */
      private String readContent(java.io.InputStream in) throws Exception {
  
          StringBuffer resultBuffer = new StringBuffer();
          SAXReader reader = new SAXReader();
          Document doc = reader.read(in);
          List<Node> textlist = CmsXmlGenericWrapper.selectNodes(doc, "//text:p[@*] | //text:span[@*]");
          Iterator<Node> li = textlist.iterator();
          while (li.hasNext()) {
              Node textNode = li.next();
              String text = textNode.getText();
              if (text.length() > 1) {
                  text = " " + text + " ";
                  resultBuffer.append(text);
              }
          }
          return resultBuffer.toString();
      }
  
  }
  