NodeUtils.java

/*
 * Copyright 1998-2016 Linux.org.ru
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

/*
 * Copyright (c) 2005-2006, Luke Plant
 * All rights reserved.
 * E-mail: <L.Plant.98@cantab.net>
 * Web: http://lukeplant.me.uk/
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *      * Redistributions of source code must retain the above copyright
 *        notice, this list of conditions and the following disclaimer.
 *
 *      * Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials provided
 *        with the distribution.
 *
 *      * The name of Luke Plant may not be used to endorse or promote
 *        products derived from this software without specific prior
 *        written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Rewrite with Java language and modified for lorsource by Ildar Hizbulin 2011
 * E-mail: <hizel@vyborg.ru>
 */
package ru.org.linux.util.bbcode;

import ru.org.linux.util.bbcode.nodes.Node;
import ru.org.linux.util.bbcode.nodes.TextNode;

public class NodeUtils {

  /**
   * Проверяем, есть ли внутри тега хоть какой-то не пустой текст
   * @param node узел проверки
   * @return пусто ли
   */
  public static boolean isEmptyNode(Node node) {
    if (node.lengthChildren() == 0) {
      return true;
    } else {
      // обработка пустого тэга
      if (node.lengthChildren() == 1) {
        Node child = node.getChildren().iterator().next();
        if (TextNode.class.isInstance(child) && ((TextNode) child).getText().trim().isEmpty()) {
          return true;
        }
      }
    }
    return false;
  }
}