/*
 * 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.expr;

import com.caucho.util.L10N;
import com.caucho.xml.QAbstractNode;
import com.caucho.xpath.Expr;
import com.caucho.xpath.ExprEnvironment;
import com.caucho.xpath.XPathException;
import com.caucho.xpath.XPathParseException;
import com.caucho.xpath.pattern.NodeIterator;

import org.w3c.dom.Node;

/**
 * Contains the builtin XPath functions.
 */
public class Functions {
  static final L10N L = new L10N(Functions.class);

  private Functions() {}
  
  /**
   * Returns the fn:base-uri value.
   */
  public static class BaseURI extends AbstractStringExpr {
    private Expr _expr;

    public BaseURI(Expr expr)
      throws XPathParseException
    {
      _expr = expr;

      if (expr == null)
        throw new XPathParseException(L.l("fn:base-uri requires a single argument"));
    }

    /**
     * Evaluates the expression as an string.
     *
     * @param node the current node
     * @param env the variable environment.
     *
     * @return the string representation of the expression.
     */
    public String evalString(Node node, ExprEnvironment env)
      throws XPathException
    {
      NodeIterator iter = _expr.evalNodeSet(node, env);

      Node result = iter.next();

      return QAbstractNode.baseURI(result);
    }

    public String toString()
    {
      return "fn:base-uri(" + _expr + ")";
    }
  }
}