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: *
23: * Free Software Foundation, Inc.
24: * 59 Temple Place, Suite 330
25: * Boston, MA 02111-1307 USA
26: *
27: * @author Scott Ferguson
28: */
29:
30: package com.caucho.servlets.ssi;
31:
32: import javax.servlet.http.HttpServletRequest;
33: import javax.servlet.http.HttpServletResponse;
34:
35: /**
36: * Represents a SSI string concat expression
37: */
38: public class ConcatExpr extends SSIExpr {
39: private final SSIExpr _left;
40: private final SSIExpr _right;
41:
42: private ConcatExpr(SSIExpr left, SSIExpr right) {
43: _left = left;
44: _right = right;
45: }
46:
47: static SSIExpr create(SSIExpr left, SSIExpr right) {
48: if (left == null)
49: return right;
50: else if (right == null)
51: return left;
52: else
53: return new ConcatExpr(left, right);
54: }
55:
56: /**
57: * Evaluate as a string.
58: */
59: public String evalString(HttpServletRequest request,
60: HttpServletResponse response) {
61: return (_left.evalString(request, response) + _right
62: .evalString(request, response));
63: }
64: }
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