01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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: }
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