/*
 * CopyNode.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 java.util.Iterator;
import java.util.StringTokenizer;
import javax.xml.namespace.QName;
import javax.xml.transform.TransformerException;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

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

  final String uas;

  CopyNode(TemplateNode children, TemplateNode next, String uas)
  {
    super(children, next);
    this.uas = uas;
  }

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

  void doApply(Stylesheet stylesheet, QName mode,
               Node context, int pos, int len,
               Node parent, Node nextSibling)
    throws TransformerException
  {
    Node copy = parent;
    switch (context.getNodeType())
      {
      case Node.TEXT_NODE:
      case Node.ATTRIBUTE_NODE:
      case Node.ELEMENT_NODE:
      case Node.PROCESSING_INSTRUCTION_NODE:
      case Node.COMMENT_NODE:
        Document doc = (parent instanceof Document) ? (Document) parent :
          parent.getOwnerDocument();
        copy = context.cloneNode(false);
        copy = doc.adoptNode(copy);
        if (copy.getNodeType() == Node.ATTRIBUTE_NODE)
          {
            if (parent.getFirstChild() != null)
              {
                // Ignore attempt to add attribute after children
              }
            else
              {
                NamedNodeMap attrs = parent.getAttributes();
                if (attrs != null)
                  {
                    attrs.setNamedItemNS(copy);
                  }
              }
          }
        else
          {
            if (nextSibling != null)
              {
                parent.insertBefore(copy, nextSibling);
              }
            else
              {
                parent.appendChild(copy);
              }
          }
      }
    if (uas != null)
      {
        StringTokenizer st = new StringTokenizer(uas, " ");
        while (st.hasMoreTokens())
          {
            addAttributeSet(stylesheet, mode, context, pos, len,
                            copy, null, st.nextToken());
          }
      }
    if (children != null)
      {
        children.apply(stylesheet, mode,
                       context, pos, len,
                       copy, null);
      }
    if (next != null)
      {
        next.apply(stylesheet, mode,
                   context, pos, len,
                   parent, nextSibling);
      }
  }
  
  void addAttributeSet(Stylesheet stylesheet, QName mode,
                       Node context, int pos, int len,
                       Node parent, Node nextSibling, String attributeSet)
    throws TransformerException
  {
    for (Iterator i = stylesheet.attributeSets.iterator(); i.hasNext(); )
      {
        AttributeSet as = (AttributeSet) i.next();
        if (!as.name.equals(attributeSet))
          {
            continue;
          }
        if (as.uas != null)
          {
            StringTokenizer st = new StringTokenizer(as.uas, " ");
            while (st.hasMoreTokens())
              {
                addAttributeSet(stylesheet, mode, context, pos, len,
                                parent, nextSibling, st.nextToken());
              }
          }
        if (as.children != null)
          {
            as.children.apply(stylesheet, mode,
                              context, pos, len,
                              parent, nextSibling);
          }
      }
  }

  public String toString()
  {
    StringBuffer buf = new StringBuffer(getClass().getName());
    buf.append('[');
    buf.append(']');
    return buf.toString();
  }

}
