/*
 * TextNode.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 program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library.  Thus, the terms and
 * conditions of the GNU General Public License cover the whole
 * combination.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obliged to do so.  If you do not wish to do so, delete this
 * exception statement from your version. 
 */

package gnu.xml.transform;

import javax.xml.namespace.QName;
import javax.xml.transform.TransformerException;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
import gnu.xml.xpath.Expr;

/**
 * A template node representing the XSL <code>text</code> instruction.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
final class TextNode
  extends TemplateNode
{

  final boolean disableOutputEscaping;

  TextNode(TemplateNode children, TemplateNode next,
           boolean disableOutputEscaping)
  {
    super(children, next);
    this.disableOutputEscaping = disableOutputEscaping;
  }

  TemplateNode clone(Stylesheet stylesheet)
  {
    return new TextNode((children == null) ? null :
                        children.clone(stylesheet),
                        (next == null) ? null :
                        next.clone(stylesheet),
                        disableOutputEscaping);
  }

  void doApply(Stylesheet stylesheet, QName mode,
             Node context, int pos, int len,
             Node parent, Node nextSibling)
    throws TransformerException
  {
    String value = "";
    Document doc = (parent instanceof Document) ? (Document) parent :
      parent.getOwnerDocument();
    if (children != null)
      {
        // Create a document fragment to hold the text
        DocumentFragment fragment = doc.createDocumentFragment();
        // Apply children to the fragment
        children.apply(stylesheet, mode,
                       context, pos, len,
                       fragment, null);
        // Use XPath string-value of fragment
        value = Expr.stringValue(fragment);
      }
    Text text = doc.createTextNode(value);
    if (disableOutputEscaping)
      {
        text.setUserData("disable-output-escaping", "yes", stylesheet);
      }
    // Insert into result tree
    if (nextSibling != null)
      {
        parent.insertBefore(text, nextSibling);
      }
    else
      {
        parent.appendChild(text);
      }
    if (next != null)
      {
        next.apply(stylesheet, mode,
                   context, pos, len,
                   parent, nextSibling);
      }
  }
  
}
