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/*
 * Copyright (c) 1998-2012 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.functions;

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.expr.AbstractStringExpr;
import com.caucho.xpath.pattern.NodeIterator;

import org.w3c.dom.Node;

/**
 * Returns the base URI of a node.
 */
public class BaseURI extends AbstractStringExpr {
  private static final L10N L = new L10N(BaseURI.class);
  
  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 + ")";
  }
}