content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE 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 General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 1999-2004 The Apache Software Foundation.
   *
   * 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.
   */
  /*
   * $Id: ExsltBase.java,v 1.1.2.1 2005/08/01 02:08:51 jeffsuttor Exp $
   */
  package jaxp.sun.org.apache.xalan.internal.lib;
  
  import jaxp.sun.org.apache.xml.internal.dtm.ref.DTMNodeProxy;
  
  import org.w3c.dom.Node;
  import org.w3c.dom.NodeList;
  
  /**
   * The base class for some EXSLT extension classes.
   * It contains common utility methods to be used by the sub-classes.
   */
  public abstract class ExsltBase
  {
    /**
     * Return the string value of a Node
     *
     * @param n The Node.
     * @return The string value of the Node
     */
    protected static String toString(Node n)
    {
      if (n instanceof DTMNodeProxy)
           return ((DTMNodeProxy)n).getStringValue();
      else
      {
        String value = n.getNodeValue();
        if (value == null)
        {
          NodeList nodelist = n.getChildNodes();
          StringBuffer buf = new StringBuffer();
          for (int i = 0; i < nodelist.getLength(); i++)
          {
            Node childNode = nodelist.item(i);
            buf.append(toString(childNode));
          }
          return buf.toString();
        }
        else
          return value;
      }
    }
  
    /**
     * Convert the string value of a Node to a number.
     * Return NaN if the string is not a valid number.
     *
     * @param n The Node.
     * @return The number value of the Node
     */
    protected static double toNumber(Node n)
    {
      double d = 0.0;
      String str = toString(n);
      try
      {
        d = Double.valueOf(str).doubleValue();
      }
      catch (NumberFormatException e)
      {
        d= Double.NaN;
      }
      return d;
    }
  }
  