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/* ElementNode.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.Iterator;

import java.util.StringTokenizer;

import javax.xml.XMLConstants;

import javax.xml.namespace.QName;

import javax.xml.transform.TransformerException;

import org.w3c.dom.Document;

import org.w3c.dom.DocumentFragment;

import org.w3c.dom.Element;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

import gnu.xml.xpath.Expr;

/**

 * A template node representing an XSL <code>element</code> instruction.

 *

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

 */

final class ElementNode

  extends TemplateNode

{

  final TemplateNode name;

  final TemplateNode namespace;

  final String uas;

  final Node source;

  final Collection elementExcludeResultPrefixes;

  ElementNode(TemplateNode name,

              TemplateNode namespace, String uas, Node source)

  {

    this.name = name;

    this.namespace = namespace;

    this.uas = uas;

    this.source = source;

    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;

      }

  }

  TemplateNode clone(Stylesheet stylesheet)

  {

    TemplateNode ret = new ElementNode(name.clone(stylesheet),

                                       (namespace == null) ? null :

                                       namespace.clone(stylesheet),

                                       uas, 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

  {

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

      parent.getOwnerDocument();

    // Create a document fragment to hold the name

    DocumentFragment fragment = doc.createDocumentFragment();

    // Apply name to the fragment

    name.apply(stylesheet, mode,

               context, pos, len,

               fragment, null);

    // Use XPath string-value of fragment

    String nameValue = Expr.stringValue(fragment);

    String namespaceValue = null;

    if (namespace != null)

      {

        // Create a document fragment to hold the namespace

        fragment = doc.createDocumentFragment();

        // Apply namespace to the fragment

        namespace.apply(stylesheet, mode,

                        context, pos, len,

                        fragment, null);

        // Use XPath string-value of fragment

        namespaceValue = Expr.stringValue(fragment);

        if (namespaceValue.length() == 0)

          {

            namespaceValue = null;

          }

      }

    String prefix = getPrefix(nameValue);

    if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix))

      {

        int ci = nameValue.indexOf(':');

        nameValue = nameValue.substring(ci + 1);

      }

    else

      {

        // Namespace aliasing

        if (prefix == null)

          {

            prefix = "#default";

          }

        String resultPrefix =

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

        if (resultPrefix != null)

          {

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

              {

                resultPrefix = null;

              }

            namespaceValue = source.lookupNamespaceURI(resultPrefix);

          }

        if (prefix == "#default")

          {

            prefix = null;

          }

        // Look up ordinary namespace for this prefix

        if (namespaceValue == null)

          {

            if (XMLConstants.XML_NS_PREFIX.equals(prefix))

              {

                namespaceValue = XMLConstants.XML_NS_URI;

              }

            else

              {

                // Resolve namespace for this prefix

                namespaceValue = source.lookupNamespaceURI(prefix);

              }

          }

        /*if (prefix == null)

          {

            // Resolve prefix for this namespace

            prefix = parent.lookupPrefix(namespaceValue);

            if (prefix != null)

              {

                nameValue = prefix + ":" + nameValue;

              }

          }*/

      }

    // Create element

    Element element = (namespaceValue != null) ?

      doc.createElementNS(namespaceValue, nameValue) :

          doc.createElement(nameValue);

    if (nextSibling != null)

      {

        parent.insertBefore(element, nextSibling);

      }

    else

      {

        parent.appendChild(element);

      }

    stylesheet.addNamespaceNodes(source, element, doc,

                                 elementExcludeResultPrefixes);

    if (uas != null)

      {

        StringTokenizer st = new StringTokenizer(uas, " ");

        while (st.hasMoreTokens())

          {

            addAttributeSet(stylesheet, mode, context, pos, len,

                            element, null, st.nextToken());

          }

      }

    if (children != null)

      {

        children.apply(stylesheet, mode,

                       context, pos, len,

                       element, null);

      }

    if (next != null)

      {

        next.apply(stylesheet, mode,

                   context, pos, len,

                   parent, nextSibling);

      }

  }

  final String getPrefix(String name)

  {

    int ci = name.indexOf(':');

    return (ci == -1) ? null : name.substring(0, ci);

  }

  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 boolean references(QName var)

  {

    if (name != null && name.references(var))

      {

        return true;

      }

    if (namespace != null && namespace.references(var))

      {

        return true;

      }

    return super.references(var);

  }

  public String toString()

  {

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

    buf.append('[');

    buf.append("name=");

    buf.append(name);

    if (uas != null)

      {

        buf.append(",uas=");

        buf.append(uas);

      }

    buf.append(']');

    return buf.toString();

  }

}