/*
 * GnomeText.java
 * Copyright (C) 2004 The Free Software Foundation
 * 
 * This file is part of GNU JAXP, a library.
 * 
 * GNU JAXP 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 2 of the License, or
 * (at your option) any later version.
 * 
 * GNU JAXP 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * As a special exception, if you link this library with other files to
 * produce an executable, this library does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * This exception does not however invalidate any other reasons why the
 * executable file might be covered by the GNU General Public License.
 */
package gnu.xml.libxmlj.dom;

import org.w3c.dom.DOMException;
import org.w3c.dom.Node;
import org.w3c.dom.Text;

/**
 * A DOM text node implemented in libxml2.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
class GnomeText
extends GnomeCharacterData
implements Text
{

  GnomeText (Object id)
  {
    super (id);
  }
  
  public Text splitText (int offset)
    throws DOMException
  {
    String value = getNodeValue ();
    String part1 = value.substring (0, offset);
    String part2 = value.substring (offset);
    Text text = getOwnerDocument ().createTextNode (part1);
    getParentNode ().insertBefore (text, this);
    setNodeValue (part2);
    return text;
  }
  
  // DOM Level 3

  public boolean isElementContentWhitespace ()
  {
    return getTextContent ().trim ().length () == 0;
  }
  
  public String getWholeText ()
  {
    Node first = this;
    Node node = getPreviousSibling ();
    while (node != null && node instanceof Text)
      {
        first = node;
        node = node.getPreviousSibling ();
      }
    StringBuffer buf = new StringBuffer (first.getNodeValue ());
    node = first.getNextSibling ();
    while (node != null && node instanceof Text)
      {
        buf.append (node.getNodeValue ());
        node = node.getNextSibling ();
      }
    return buf.toString ();
  }

  public Text replaceWholeText (String content) throws DOMException
  {
    boolean isEmpty = (content == null || content.length () == 0);
    if (!isEmpty)
      {
        setNodeValue (content);
      }
    
    Node first = this;
    Node node = getPreviousSibling ();
    while (node != null && node instanceof Text)
      {
        first = node;
        node = node.getPreviousSibling ();
      }
    node = first.getNextSibling ();
    Node parent = getParentNode ();
    if (first != this || isEmpty)
      {
        parent.removeChild (first);
      }
    while (node != null && node instanceof Text)
      {
        Node tmp = node;
        node = node.getNextSibling ();
        if (tmp != this || isEmpty)
          {
            parent.removeChild (tmp);
          }
      }
    return (isEmpty) ? null : this;
  }

}