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/* AttributeNode.java --

   Copyright (C) 2004,2006 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 gnu.java.lang.CPStringBuilder;

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.Attr;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

import gnu.xml.xpath.Expr;

/**

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

 *

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

 */

final class AttributeNode

  extends TemplateNode

{

  final TemplateNode name;

  final TemplateNode namespace;

  final Node source;

  AttributeNode(TemplateNode name,

                TemplateNode namespace, Node source)

  {

    this.name = name;

    this.namespace = namespace;

    this.source = source;

  }

  TemplateNode clone(Stylesheet stylesheet)

  {

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

                                         (namespace == null) ? null :

                                         namespace.clone(stylesheet),

                                         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 (namespaceValue == null)

      {

        if (prefix != null)

          {

            if (XMLConstants.XML_NS_PREFIX.equals(prefix))

              namespaceValue = XMLConstants.XML_NS_URI;

            else

              {

                // Resolve namespace for this prefix

                namespaceValue = source.lookupNamespaceURI(prefix);

              }

          }

      }

    else

      {

        if (prefix != null)

          {

            String ns2 = source.lookupNamespaceURI(prefix);

            if (ns2 != null && !ns2.equals(namespaceValue))

              {

                // prefix clashes, reset it

                prefix = null;

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

                nameValue = nameValue.substring(ci + 1);

              }

          }

      }

    if (prefix == null)

      {

        // Resolve prefix for this namespace

        prefix = source.lookupPrefix(namespaceValue);

        if (prefix != null)

          nameValue = prefix + ":" + nameValue;

        else

          {

            if (namespaceValue != null)

              {

                // Must invent a prefix

                prefix = inventPrefix(parent);

                nameValue = prefix + ":" + nameValue;

              }

          }

      }

    NamedNodeMap attrs = parent.getAttributes();

    boolean insert = true;

    if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(namespaceValue) ||

        XMLConstants.XMLNS_ATTRIBUTE.equals(nameValue) ||

        nameValue.startsWith("xmlns:"))

      {

        // Namespace declaration, do not output

        insert = false;

      }

    if (prefix != null && namespaceValue == null)

      {

        // Not a QName

        insert = false;

      }

    if (parent.getNodeType() == Node.ELEMENT_NODE &&

        parent.getFirstChild() != null)

      {

        // XSLT 7.1.3 Adding an attribute to an element after children have

        // been added to it is an error

        insert = false;

      }

    if (insert)

      {

        // Insert attribute

        Attr attr = (namespaceValue != null) ?

          doc.createAttributeNS(namespaceValue, nameValue) :

              doc.createAttribute(nameValue);

        if (attrs != null)

          {

            if (namespace != null)

              attrs.setNamedItemNS(attr);

            else

              attrs.setNamedItem(attr);

          }

        if (children != null)

          children.apply(stylesheet, mode,

                         context, pos, len,

                         attr, 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);

  }

  final String inventPrefix(Node parent)

  {

    String base = "ns";

    int count = 0;

    String ret = base + Integer.toString(count);

    while (parent.lookupNamespaceURI(ret) != null)

      {

        count++;

        ret = base + Integer.toString(count);

      }

    return ret;

  }

  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()

  {

    CPStringBuilder buf = new CPStringBuilder("attribute");

    buf.append('[');

    buf.append("name=");

    buf.append(name);

    buf.append(']');

    return buf.toString();

  }

}