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Java > Open Source Codes > com > caucho > xpath > XPathFun


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 JavaDoc;
34
35 import java.util.ArrayList JavaDoc;
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 JavaDoc eval(Node JavaDoc node, ExprEnvironment env,
49                   AbstractPattern pattern, ArrayList JavaDoc args)
50     throws XPathException;
51 }
52
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