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/* LiteralNode.java --

   Copyright (C) 2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)

any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 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

obligated 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.Collection;

import java.util.Collections;

import java.util.HashSet;

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 that copies a DOM node in the template to the result

 * tree.

 *

 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>

 */

final class LiteralNode

  extends TemplateNode

{

  /**

   * The source node in the XSL template.

   */

  final Node source;

  final Collection elementExcludeResultPrefixes;

  LiteralNode(Node source)

  {

    this.source = source;

    if (source.getNodeType() == Node.ELEMENT_NODE)

      {

        NamedNodeMap attrs = source.getAttributes();

        Node attr = attrs.getNamedItemNS(Stylesheet.XSL_NS,

                                         "exclude-result-prefixes");

        if (attr != null)

          {

            elementExcludeResultPrefixes = new HashSet();

            StringTokenizer st = new StringTokenizer(attr.getNodeValue());

            while (st.hasMoreTokens())

              {

                elementExcludeResultPrefixes.add(st.nextToken());

              }

          }

        else

          {

            elementExcludeResultPrefixes = Collections.EMPTY_SET;

          }

      }

    else

      {

        elementExcludeResultPrefixes = null;

      }

  }

  TemplateNode clone(Stylesheet stylesheet)

  {

    TemplateNode ret = new LiteralNode(source);

    if (children != null)

      {

        ret.children = children.clone(stylesheet);

      }

    if (next != null)

      {

        ret.next = next.clone(stylesheet);

      }

    return ret;

  }

  void doApply(Stylesheet stylesheet, QName mode,

             Node context, int pos, int len,

             Node parent, Node nextSibling)

    throws TransformerException

  {

    Node result = null;

    Document doc = (parent instanceof Document) ? (Document) parent :

      parent.getOwnerDocument();

    short nodeType = source.getNodeType();

    if (nodeType == Node.ATTRIBUTE_NODE &&

        parent.getFirstChild() != null)

      {

        // Ignore attributes added after child elements

      }

    else

      {

        // Namespace aliasing

        if (nodeType == Node.ELEMENT_NODE)

          {

            String prefix = source.getPrefix();

            if (prefix == null)

              {

                prefix = "#default";

              }

            String resultPrefix =

              (String) stylesheet.namespaceAliases.get(prefix);

            if (resultPrefix != null)

              {

                if ("#default".equals(resultPrefix))

                  {

                    resultPrefix = null;

                  }

                String uri = source.lookupNamespaceURI(resultPrefix);

                String name = source.getNodeName();

                // Create a new element node in the result document

                result = doc.createElementNS(uri, name);

                // copy attributes

                NamedNodeMap srcAttrs = source.getAttributes();

                NamedNodeMap dstAttrs = result.getAttributes();

                int l = srcAttrs.getLength();

                for (int i = 0; i < l; i++)

                  {

                    Node attr = srcAttrs.item(i);

                    if (!Stylesheet.XSL_NS.equals(attr.getNamespaceURI()))

                      {

                        attr = attr.cloneNode(true);

                        attr = doc.adoptNode(attr);

                        dstAttrs.setNamedItemNS(attr);

                      }

                  }

              }

          }

        if (result == null)

          {

            // Create result node

            result = source.cloneNode(false);

            // Remove any XSL attributes

            NamedNodeMap attrs = result.getAttributes();

            if (attrs != null)

              {

                int l = attrs.getLength();

                for (int i = 0; i < l; i++)

                  {

                    Node attr = attrs.item(i);

                    if (Stylesheet.XSL_NS.equals(attr.getNamespaceURI()))

                      {

                        attrs.removeNamedItem(attr.getNodeName());

                        i--;

                        l--;

                      }

                  }

              }

            Node result2 = doc.adoptNode(result);

            if (result2 == null)

              {

                String msg = "Error adopting node to result tree: " +

                  result + " (" + result.getClass().getName() + ")";

                DOMSourceLocator l = new DOMSourceLocator(context);

                throw new TransformerException(msg, l);

              }

            result = result2;

          }

        if (nextSibling != null)

          {

            parent.insertBefore(result, nextSibling);

          }

        else

          {

            parent.appendChild(result);

          }

        if (nodeType == Node.ELEMENT_NODE)

          {

            stylesheet.addNamespaceNodes(source, result, doc,

                                         elementExcludeResultPrefixes);

          }

        // children

        if (children != null)

          {

            children.apply(stylesheet, mode,

                           context, pos, len,

                           result, null);

          }

      }

    // next sibling

    if (next != null)

      {

        next.apply(stylesheet, mode,

                   context, pos, len,

                   parent, nextSibling);

      }

  }

  public String toString()

  {

    StringBuffer buf = new StringBuffer(getClass().getName());

    buf.append('[');

    buf.append("source=");

    buf.append(source);

    buf.append(']');

    return buf.toString();

  }

}