/*
* The MIT License
*
* Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package hudson.security;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
/**
* Servlet {@link Filter} that chains multiple {@link Filter}s.
*
* @author Kohsuke Kawaguchi
*/
public class ChainedServletFilter implements Filter {
// array is assumed to be immutable once set
protected volatile Filter[] filters;
public ChainedServletFilter() {
filters = new Filter[0];
}
public ChainedServletFilter(Filter... filters) {
this(Arrays.asList(filters));
}
public ChainedServletFilter(Collection<? extends Filter> filters) {
setFilters(filters);
}
public void setFilters(Collection<? extends Filter> filters) {
this.filters = filters.toArray(new Filter[filters.size()]);
}
public void init(FilterConfig filterConfig) throws ServletException {
if (LOGGER.isLoggable(Level.FINEST))
for (Filter f : filters)
LOGGER.finest("ChainedServletFilter contains: " + f);
for (Filter f : filters)
f.init(filterConfig);
}
public void doFilter(ServletRequest request, ServletResponse response, final FilterChain chain) throws IOException, ServletException {
LOGGER.entering(ChainedServletFilter.class.getName(), "doFilter");
new FilterChain() {
private int position=0;
// capture the array for thread-safety
private final Filter[] filters = ChainedServletFilter.this.filters;
public void doFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException {
if(position==filters.length) {
// reached to the end
chain.doFilter(request,response);
} else {
// call next
filters[position++].doFilter(request,response,this);
}
}
}.doFilter(request,response);
}
public void destroy() {
for (Filter f : filters)
f.destroy();
}
private static final Logger LOGGER = Logger.getLogger(ChainedServletFilter.class.getName());
}