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 Sam
28: */
29:
30: package com.caucho.server.rewrite;
31:
32: import com.caucho.config.ConfigException;
33: import com.caucho.server.connection.CauchoResponse;
34: import com.caucho.util.L10N;
35:
36: import javax.servlet.http.HttpServletResponse;
37: import javax.servlet.http.HttpServletResponseWrapper;
38:
39: abstract public class AbstractCondition implements Condition {
40: private static final L10N L = new L10N(AbstractCondition.class);
41:
42: public void init() {
43: }
44:
45: public String getTagName() {
46: return getClass().getName();
47: }
48:
49: /**
50: * Throws an exception if the passed value is null.
51: */
52: protected void required(Object value, String name)
53: throws ConfigException {
54: if (value == null)
55: throw new ConfigException(L
56: .l("{0} requires '{1}' attribute.", getTagName(),
57: name));
58: }
59:
60: protected void addHeaderValue(HttpServletResponse response,
61: String header, String value) {
62: while (response instanceof HttpServletResponseWrapper)
63: response = (HttpServletResponse) ((HttpServletResponseWrapper) response)
64: .getResponse();
65:
66: if (response instanceof CauchoResponse) {
67: CauchoResponse res = (CauchoResponse) response;
68:
69: String currentValue = res.getHeader(header);
70:
71: if (currentValue != null) {
72: if (currentValue.equals(value)
73: || (currentValue.contains(value + ","))
74: || (currentValue.contains(", " + value))) {
75: } else {
76: res.setHeader(header, currentValue + ", " + value);
77: }
78: } else {
79: res.setHeader(header, value);
80: }
81: } else {
82: response.addHeader(header, value);
83: }
84: }
85:
86: public void destroy() {
87: }
88: }
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