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: XNull.java,v 1.2.4.1 2005/09/14 20:34:46 jeffsuttor Exp $
   */
  package jaxp.sun.org.apache.xpath.internal.objects;
  
  import jaxp.sun.org.apache.xml.internal.dtm.DTM;
  import jaxp.sun.org.apache.xpath.internal.XPathContext;
  
  /**
   * This class represents an XPath null object, and is capable of
   * converting the null to other types, such as a string.
   * @xsl.usage general
   */
  public class XNull extends XNodeSet
  {
      static final long serialVersionUID = -6841683711458983005L;
  
    /**
     * Create an XObject.
     */
    public XNull()
    {
      super();
    }
  
    /**
     * Tell what kind of class this is.
     *
     * @return type CLASS_NULL
     */
    public int getType()
    {
      return CLASS_NULL;
    }
  
    /**
     * Given a request type, return the equivalent string.
     * For diagnostic purposes.
     *
     * @return type string "#CLASS_NULL"
     */
    public String getTypeString()
    {
      return "#CLASS_NULL";
    }
  
    /**
     * Cast result object to a number.
     *
     * @return 0.0
     */
  
    public double num()
    {
      return 0.0;
    }
  
    /**
     * Cast result object to a boolean.
     *
     * @return false
     */
    public boolean bool()
    {
      return false;
    }
  
    /**
     * Cast result object to a string.
     *
     * @return empty string ""
     */
    public String str()
    {
      return "";
    }
  
    /**
     * Cast result object to a result tree fragment.
     *
     * @param support XPath context to use for the conversion
     *
     * @return The object as a result tree fragment.
     */
    public int rtf(XPathContext support)
    {
      // DTM frag = support.createDocumentFragment();
      // %REVIEW%
      return DTM.NULL;
    }
  
  //  /**
  //   * Cast result object to a nodelist.
  //   *
  //   * @return null
  //   */
  //  public DTMIterator iter()
  //  {
  //    return null;
  //  }
  
    /**
     * Tell if two objects are functionally equal.
     *
     * @param obj2 Object to compare this to
     *
     * @return True if the given object is of type CLASS_NULL
     */
    public boolean equals(XObject obj2)
    {
      return obj2.getType() == CLASS_NULL;
    }
  }
  