/*
 * Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source 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.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *   Free SoftwareFoundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.xpath.pattern;

import com.caucho.xpath.ExprEnvironment;
import com.caucho.xpath.XPathException;

import org.w3c.dom.Node;

public class NamespacePattern extends AbstractPattern {
  private String _prefix;
  private int _nodeType;

  public NamespacePattern(AbstractPattern parent, String prefix, int nodeType)
  {
    super(parent);

    _prefix = prefix;
    _nodeType = nodeType;

    if (parent == null)
      throw new RuntimeException();
  }

  /**
   * The node-type priority is less than nodes.
   */
  public double getPriority()
  {
    return -0.25;
  } 

  /**
   * Matches if the namespace matches and the local name matches.
   *
   * @param node the current node
   * @param env the variable environment
   *
   * @return true if the node matches
   */
  public boolean match(Node node, ExprEnvironment env)
    throws XPathException
  {
    if (node == null)
      return false;

    if (node.getNodeType() != _nodeType)
      return false;

    String prefix = node.getPrefix();

    if (! (prefix == _prefix || (prefix != null && prefix.equals(_prefix))))
      return false;

    return _parent.match(node, env);
  }

  public String toString()
  {
    switch (_nodeType) {
    case Node.ATTRIBUTE_NODE:
      return _parent.toString() + "@" + _prefix + ":*";
    case Node.ELEMENT_NODE:
      return _parent.toString() + _prefix + ":*";

    default:
      return super.toString();
    }
  }
}