1 /* 2 * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved 3 * 4 * This file is part of Resin(R) Open Source 5 * 6 * Each copy or derived work must preserve the copyright notice and this 7 * notice unmodified. 8 * 9 * Resin Open Source is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * Resin Open Source is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty 17 * of NON-INFRINGEMENT. See the GNU General Public License for more 18 * details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with Resin Open Source; if not, write to the 22 * Free SoftwareFoundation, Inc. 23 * 59 Temple Place, Suite 330 24 * Boston, MA 02111-1307 USA 25 * 26 * @author Scott Ferguson 27 */ 28 29 package com.caucho.xpath; 30 31 import com.caucho.xpath.pattern.AbstractPattern; 32 33 import org.w3c.dom.Node; 34 35 import java.util.ArrayList; 36 37 /** 38 * Base class for XPath functions. The custom functions can use the 39 * Expr.toBoolean, etc. functions to convert to normal Java types. 40 */ 41 public abstract class XPathFun { 42 /** 43 * Evaluate the function. 44 * 45 * @param pattern The context pattern. 46 * @param args The evaluated arguments 47 */ 48 public abstract Object eval(Node node, ExprEnvironment env, 49 AbstractPattern pattern, ArrayList args) 50 throws XPathException; 51 } 52