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org.apache.jetspeed.engine.servlet.StaticResourceCachingFilter	0%	0%

1		/*
2		* Licensed to the Apache Software Foundation (ASF) under one or more
3		* contributor license agreements. See the NOTICE file distributed with
4		* this work for additional information regarding copyright ownership.
5		* The ASF licenses this file to You under the Apache License, Version 2.0
6		* (the "License"); you may not use this file except in compliance with
7		* the License. You may obtain a copy of the License at
8		*
9		* http://www.apache.org/licenses/LICENSE-2.0
10		*
11		* Unless required by applicable law or agreed to in writing, software
12		* distributed under the License is distributed on an "AS IS" BASIS,
13		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14		* See the License for the specific language governing permissions and
15		* limitations under the License.
16		*/
17		package org.apache.jetspeed.engine.servlet;
18
19		import java.util.TimeZone;
20
21		import javax.servlet.Filter;
22		import javax.servlet.FilterChain;
23		import javax.servlet.FilterConfig;
24		import javax.servlet.ServletException;
25		import javax.servlet.ServletRequest;
26		import javax.servlet.ServletResponse;
27		import javax.servlet.http.HttpServletRequest;
28		import javax.servlet.http.HttpServletResponse;
29
30		public class StaticResourceCachingFilter implements Filter
31		{
32		// constants
33
34		private static final String HTTP_HEADER_EXPIRES = "Expires" ;
35		private static final String HTTP_HEADER_CACHE_CONTROL = "Cache-Control" ;
36		private static final String HTTP_HEADER_CACHE_MAX_AGE = "max-age" ;
37		private static final String HTTP_HEADER_CACHE_MAX_AGE_EQ = "max-age=" ;
38
39	0	private static String PARAM_EXPIRES_HOURS = "ExpireHours";
40
41	0	private static final TimeZone GMT_TIME_ZONE = TimeZone.getTimeZone( "GMT" );
42
43
44		// members
45
46	0	private double expires_in_hours = 0.0;
47	0	private int max_age = 0;
48
49		// constructor
50
51		public StaticResourceCachingFilter()
52		{
53	0	super() ;
54	0	}
55
56
57		// protocol
58
59		public void init( FilterConfig config )
60		{
61		try
62		{
63	0	expires_in_hours = Double.parseDouble( config.getInitParameter( PARAM_EXPIRES_HOURS ) );
64		}
65	0	catch ( NumberFormatException ex )
66		{
67	0	expires_in_hours = 0;
68	0	}
69	0	max_age = (int)(expires_in_hours * 60);
70	0	}
71
72		public void doFilter( ServletRequest aRequest, ServletResponse aResponse, FilterChain chain )
73		throws java.io.IOException, ServletException
74		{
75	0	HttpServletRequest request = (HttpServletRequest)aRequest;
76	0	HttpServletResponse response = (HttpServletResponse)aResponse;
77	0	if ( max_age > 0 )
78		{
79	0	String cacheControlVal = HTTP_HEADER_CACHE_MAX_AGE_EQ + max_age;
80	0	response.setHeader( HTTP_HEADER_CACHE_CONTROL, cacheControlVal );
81		}
82	0	chain.doFilter( request, response );
83	0	}
84
85		public void destroy()
86		{
87	0	}
88
89
90		/* unused (we're only doing Cache-Control max-age), but works for generating Expires header
91		private String createExpiresHeader( int expiresInHours )
92		{
93		SimpleDateFormat sdf = new SimpleDateFormat( "EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US );
94		sdf.setTimeZone( GMT_TIME_ZONE );
95		Calendar cal = Calendar.getInstance();
96		cal.add( Calendar.HOUR, expiresInHours );
97		long millis = cal.getTimeInMillis();
98		Date d = new Date( millis );
99		return sdf.format( d );
100		}
101		*/
102		}

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