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/* DomHTMLCollection.java --

   Copyright (C) 2005 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.dom.html2;

import gnu.xml.dom.DomDOMException;

import gnu.xml.dom.DomElement;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.LinkedList;

import java.util.List;

import org.w3c.dom.DOMException;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import org.w3c.dom.html2.HTMLCollection;

import org.w3c.dom.html2.HTMLOptionsCollection;

import org.w3c.dom.traversal.NodeFilter;

import org.w3c.dom.traversal.NodeIterator;

/**

 * An HTML element collection.

 *

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

 */

class DomHTMLCollection

  implements HTMLCollection, HTMLOptionsCollection, NodeList, NodeFilter

{

  final DomHTMLDocument doc;

  final Node root;

  List nodeNames;

  List attributeNames;

  List results;

  DomHTMLCollection(DomHTMLDocument doc, Node root)

  {

    this.doc = doc;

    this.root = root;

  }

  // -- Node name and attribute filtering --

  void addNodeName(String name)

  {

    if (nodeNames == null)

      {

        nodeNames = new LinkedList();

      }

    nodeNames.add(name);

  }

  void addAttributeName(String name)

  {

    if (attributeNames == null)

      {

        attributeNames = new LinkedList();

      }

    attributeNames.add(name);

  }

  public short acceptNode(Node n)

  {

    if (n.getNodeType() != Node.ELEMENT_NODE)

      {

        return NodeFilter.FILTER_SKIP;

      }

    String localName = n.getLocalName();

    if (localName == null)

      {

        localName = n.getNodeName();

      }

    if (nodeNames != null && !acceptName(localName))

      {

        return NodeFilter.FILTER_SKIP;

      }

    if (attributeNames != null && !acceptAttributes(n.getAttributes()))

      {

        return NodeFilter.FILTER_SKIP;

      }

    return NodeFilter.FILTER_ACCEPT;

  }

  private boolean acceptName(String name)

  {

    for (Iterator i = nodeNames.iterator(); i.hasNext(); )

      {

        String nodeName = (String) i.next();

        if (nodeName.equalsIgnoreCase(name))

          {

            return true;

          }

      }

    return false;

  }

  private boolean acceptAttributes(NamedNodeMap attrs)

  {

    for (Iterator i = attributeNames.iterator(); i.hasNext(); )

      {

        String attributeName = (String) i.next();

        Node attr = getNamedItem(attrs, attributeName);

        if (attr != null)

          {

            // Check that attribute has a non-null value

            String nodeValue = attr.getNodeValue();

            if (nodeValue != null && nodeValue.length() > 0)

              {

                return true;

              }

          }

      }

    return false;

  }

  /**

   * Case-insensitive version of getNamedItem.

   */

  private Node getNamedItem(NamedNodeMap attrs, String name)

  {

    int len = attrs.getLength();

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

      {

        Node attr = attrs.item(i);

        String attrName = attr.getLocalName();

        if (attrName == null)

          {

            attrName = attr.getNodeName();

          }

        if (name.equalsIgnoreCase(attrName))

          {

            return attr;

          }

      }

    return null;

  }

  // -- Perform query --

  void evaluate()

  {

    NodeIterator i = doc.createNodeIterator(root, NodeFilter.SHOW_ELEMENT,

                                            this, true);

    results = new ArrayList();

    for (Node node = i.nextNode(); node != null; node = i.nextNode())

      {

        results.add(node);

      }

  }

  // -- HTMLCollection/NodeList interface --

  public int getLength()

  {

    return results.size();

  }

  public void setLength(int length)

  {

    throw new DomDOMException(DOMException.NOT_SUPPORTED_ERR);

  }

  public Node item(int index)

  {

    return (Node) results.get(index);

  }

  public Node namedItem(String name)

  {

    boolean xhtml = false; // FIXME detect XHTML document

    for (Iterator i = results.iterator(); i.hasNext(); )

      {

        Node node = (Node) i.next();

        NamedNodeMap attrs = node.getAttributes();

        Node attr = getNamedItem(attrs, "id");

        if (name.equals(attr.getTextContent()))

          {

            return node;

          }

        if (!xhtml)

          {

            attr = getNamedItem(attrs, "name");

            if (name.equals(attr.getTextContent()))

              {

                return node;

              }

          }

      }

    return null;

  }

}