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, 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.pdftools.dtds;
  
  import java.io.IOException;
  import java.net.URL;
  
  import org.xml.sax.EntityResolver;
  import org.xml.sax.InputSource;
  import org.xml.sax.SAXException;
  
  /**
   * Entity resolver for XHTML entities.<p>
   */
  public class XhtmlEntityResolver implements EntityResolver {
  
      /** The XHTML prefix. */
      static final String XHTML_PREFIX = "http://www.w3.org/TR/xhtml1/DTD/";
  
      /** The next entity resolver. */
      private final EntityResolver m_next;
  
      /**
       * Constructor.<p>
       **/
      public XhtmlEntityResolver() {
          this(null);
      }
  
      /**
       * Constructor.<p>
       *
       * @param next the next entity resolver.<p>
       */
      public XhtmlEntityResolver(EntityResolver next) {
          m_next = next;
      }
  
      /**
       * @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String, java.lang.String)
       */
      @Override
      public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
  
          if (systemId.startsWith(XHTML_PREFIX)) {
              String name = systemId.substring(XHTML_PREFIX.length());
              //final InputStream resourceAsStream = getClass().getResourceAsStream(name);
              URL resource = getClass().getResource(name);
              if (resource != null) {
                  InputSource inputSource = new InputSource(resource.toExternalForm());
                  inputSource.setPublicId(publicId);
                  //inputSource.setByteStream(resourceAsStream);
                  return inputSource;
              }
          }
  
          // Let file: URLs just get loaded using the default mechanism
          if (systemId.startsWith("file:") || systemId.startsWith("jar:")) {
              return null;
          }
          if (m_next != null) {
              return m_next.resolveEntity(publicId, systemId);
          } else {
              return null;
          }
      }
  }
  