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.jsp;
  
  import org.opencms.file.CmsObject;
  import org.opencms.flex.CmsFlexController;
  import org.opencms.i18n.CmsMessageContainer;
  import org.opencms.jsp.util.CmsJspResourceAccessBean;
  import org.opencms.main.OpenCms;
  
  import javax.servlet.jsp.JspException;
  import javax.servlet.jsp.JspTagException;
  import javax.servlet.jsp.tagext.Tag;
  
  /**
   * Used to access resource information from the current open <code>&lt;cms:resourceload&gt;</code>
   * tag using JSP page context and the JSP EL.<p>
   *
   * The tag will create an instance of a {@link CmsJspResourceAccessBean} that is stored in the selected context.
   * Use the options provided by the bean to access the resource directly.<p>
   *
   * For example together with the JSTL, use this tag inside an open tag like this:<pre>
   * &lt;cms:resourceload ... &gt;
   *     &lt;cms:resourceaccess var="myVarName" scope="page" /&gt;
   *     ... other code ...
   * &lt;/cms:resourceload&gt;</pre>
   *
   * @since 8.0
   */
  public class CmsJspTagResourceAccess extends CmsJspScopedVarBodyTagSuport {
  
      /** Serial version UID required for safe serialization. */
      private static final long serialVersionUID = 2588220869205763894L;
  
      /**
       * @see javax.servlet.jsp.tagext.Tag#doEndTag()
       */
      @Override
      public int doEndTag() {
  
          if (OpenCms.getSystemInfo().getServletContainerSettings().isReleaseTagsAfterEnd()) {
              // need to release manually, JSP container may not call release as required (happens with Tomcat)
              release();
          }
          return EVAL_PAGE;
      }
  
      /**
       * @see javax.servlet.jsp.tagext.Tag#doStartTag()
       */
      @Override
      public int doStartTag() throws JspException {
  
          // get the current users OpenCms context
          CmsObject cms = CmsFlexController.getCmsObject(pageContext.getRequest());
  
          // get a reference to the parent "content container" class
          Tag ancestor = findAncestorWithClass(this, I_CmsResourceContainer.class);
          if (ancestor == null) {
              CmsMessageContainer errMsgContainer = Messages.get().container(
                  Messages.ERR_PARENTLESS_TAG_1,
                  "resourceaccess");
              String msg = Messages.getLocalizedMessage(errMsgContainer, pageContext);
              throw new JspTagException(msg);
          }
          // get the currently open resource container
          I_CmsResourceContainer resourceContainer = (I_CmsResourceContainer)ancestor;
  
          // initialize a new instance of a resource access bean
          CmsJspResourceAccessBean bean = new CmsJspResourceAccessBean(cms, resourceContainer.getResource());
  
          // store the resource in the selected page context scope
          storeAttribute(bean);
  
          return SKIP_BODY;
      }
  }