/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.web.tomcat.filters;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import org.jboss.logging.Logger;
/** A servlet filter that simply adds all header specified in its config
to replies the filter is mapped to. An example would be to set the cache
control max age:
<filter>
<filter-name>CacheControlFilter</filter-name>
<filter-class>filter.ReplyHeaderFilter</filter-class>
<init-param>
<param-name>Cache-Control</param-name>
<param-value>max-age=3600</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CacheControlFilter</filter-name>
<url-pattern>/images/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>CacheControlFilter</filter-name>
<url-pattern>*.js</url-pattern>
</filter-mapping>
@author Scott.Stark@jboss.org
@version $Revison:$
*/
public class ReplyHeaderFilter implements Filter
{
static Logger log = Logger.getLogger(ReplyHeaderFilter.class);
private String[][] replyHeaders = {{}};
public void init(FilterConfig config)
{
Enumeration names = config.getInitParameterNames();
ArrayList tmp = new ArrayList();
while( names.hasMoreElements() )
{
String name = (String) names.nextElement();
String value = config.getInitParameter(name);
log.debug("Adding header name: "+name+"='"+value+"'");
String[] pair = {name, value};
tmp.add(pair);
}
replyHeaders = new String[tmp.size()][2];
tmp.toArray(replyHeaders);
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException
{
// Apply the headers
HttpServletResponse httpResponse = (HttpServletResponse) response;
for(int n = 0; n < replyHeaders.length; n ++)
{
String name = replyHeaders[n][0];
String value = replyHeaders[n][1];
httpResponse.addHeader(name, value);
}
chain.doFilter(request, response);
}
public void destroy()
{
}
}