Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
HttpUtils |
|
| 1.5;1,5 |
1 | package org.apache.turbine.util; | |
2 | ||
3 | /* | |
4 | * Licensed to the Apache Software Foundation (ASF) under one | |
5 | * or more contributor license agreements. See the NOTICE file | |
6 | * distributed with this work for additional information | |
7 | * regarding copyright ownership. The ASF licenses this file | |
8 | * to you under the Apache License, Version 2.0 (the | |
9 | * "License"); you may not use this file except in compliance | |
10 | * with the License. You may obtain a copy of the License at | |
11 | * | |
12 | * http://www.apache.org/licenses/LICENSE-2.0 | |
13 | * | |
14 | * Unless required by applicable law or agreed to in writing, | |
15 | * software distributed under the License is distributed on an | |
16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
17 | * KIND, either express or implied. See the License for the | |
18 | * specific language governing permissions and limitations | |
19 | * under the License. | |
20 | */ | |
21 | ||
22 | import java.text.SimpleDateFormat; | |
23 | import java.util.Date; | |
24 | import java.util.Locale; | |
25 | import java.util.TimeZone; | |
26 | ||
27 | /** | |
28 | * This class provides utilities for handling some semi-trivial HTTP stuff that | |
29 | * would otherwise be handled elsewhere. | |
30 | * | |
31 | * @author <a href="mailto:magnus@handpoint.com">Magnús Þór Torfason</a> | |
32 | * @version $Id: HttpUtils.java 1071052 2011-02-15 20:54:47Z tv $ | |
33 | */ | |
34 | 0 | public class HttpUtils |
35 | { | |
36 | /** | |
37 | * The date format to use for HTTP Dates. | |
38 | */ | |
39 | private static SimpleDateFormat httpDateFormat; | |
40 | ||
41 | static | |
42 | { | |
43 | 0 | httpDateFormat = new SimpleDateFormat( |
44 | "EEE, dd MMM yyyy HH:mm:ss z", Locale.US); | |
45 | 0 | httpDateFormat.setTimeZone(TimeZone.getTimeZone("GMT")); |
46 | 0 | } |
47 | ||
48 | /** | |
49 | * Formats a java Date according to rfc 1123, the rfc standard for dates in | |
50 | * http. | |
51 | * | |
52 | * @param date The Date to format | |
53 | * @return A String representation of the date | |
54 | */ | |
55 | public static String formatHttpDate(Date date) | |
56 | { | |
57 | 0 | synchronized (httpDateFormat) |
58 | { | |
59 | 0 | return httpDateFormat.format(date); |
60 | 0 | } |
61 | } | |
62 | ||
63 | /** | |
64 | * This method sets the required expiration headers in the response for a | |
65 | * given RunData object. This method attempts to set all relevant headers, | |
66 | * both for HTTP 1.0 and HTTP 1.1. | |
67 | * | |
68 | * @param data The RunData object we are setting cache information for. | |
69 | * @param expiry The number of milliseconds until the document should expire, | |
70 | * <code>0</code> indicating immediate expiration (i.e. no caching). | |
71 | */ | |
72 | public static void setCacheHeaders(RunData data, int expiry) | |
73 | { | |
74 | 0 | if (0 == expiry) |
75 | { | |
76 | 0 | data.getResponse().setHeader("Pragma", "no-cache"); |
77 | 0 | data.getResponse().setHeader("Cache-Control", "no-cache"); |
78 | 0 | data.getResponse().setDateHeader("Expires", System.currentTimeMillis()); |
79 | } | |
80 | else | |
81 | { | |
82 | 0 | data.getResponse().setDateHeader("Expires", System.currentTimeMillis() + expiry); |
83 | } | |
84 | 0 | } |
85 | } |