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 javax.servlet.jsp.tagext.TagData;
  import javax.servlet.jsp.tagext.TagExtraInfo;
  
  /**
   * This is a TagExtraInfo evaluation class that checks the attibutes of
   * the <code>&lt;cms:include /&gt;</code> tag.<p>
   *
   * @since 6.0.0
   */
  public class CmsJspTagIncludeTEI extends TagExtraInfo {
  
      /** Attribute name. */
      private static final String ATTR_ATTRIBUTE = "attribute";
  
      /** Attribute name. */
      private static final String ATTR_FILE = "file";
  
      /** Attribute name. */
      private static final String ATTR_PAGE = "page";
  
      /** Attribute name. */
      private static final String ATTR_PROPERTY = "property";
  
      /** Attribute name. */
      private static final String ATTR_SUFFIX = "suffix";
  
      /**
       * Returns true if the given attribute name is specified, false otherwise.<p>
       *
       * @param data the tag data
       * @param attributeName the attribute name
       * @return  true if the given attribute name is specified, false otherwise
       */
      public static boolean isSpecified(TagData data, String attributeName) {
  
          return (data.getAttribute(attributeName) != null);
      }
  
      /**
       * Checks the validity of the <code>&lt;cms:include /&gt;</code> attributes.<p>
       *
       * The logic used is:
       * <pre>
       * if (hasFile && (hasSuffix || hasProperty || hasAttribute)) return false;
       * if (hasProperty && hasAttribute) return false;
       * if (hasSuffix && !(hasProperty || hasAttribute)) return false;
       * </pre>
       *
       * @param data the tag data
       * @return true if attributes are valid, false otherwise
       */
      @Override
      public boolean isValid(TagData data) {
  
          boolean hasFile = isSpecified(data, ATTR_FILE) || isSpecified(data, ATTR_PAGE);
          boolean hasSuffix = isSpecified(data, ATTR_SUFFIX);
          boolean hasProperty = isSpecified(data, ATTR_PROPERTY);
          boolean hasAttribute = isSpecified(data, ATTR_ATTRIBUTE);
          // boolean hasElement = isSpecified(data, C_ATTR_ELEMENT);
  
          if (hasFile && (hasSuffix || hasProperty || hasAttribute)) {
              return false;
          }
          if (hasProperty && hasAttribute) {
              return false;
          }
          if (hasSuffix && !(hasProperty || hasAttribute)) {
              return false;
          }
  
          return true;
      }
  }
  