package org.jboss.seam.web;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
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 org.jboss.seam.contexts.Context;
import org.jboss.seam.contexts.WebApplicationContext;
import org.jboss.seam.core.Init;
import org.jboss.seam.log.LogProvider;
import org.jboss.seam.log.Logging;
public class SeamFilter implements Filter
{
private static final LogProvider log = Logging.getLogProvider(SeamFilter.class);
private List<Filter> filters = new ArrayList<Filter>();
private class FilterChainImpl implements FilterChain
{
private FilterChain chain;
private int index;
private FilterChainImpl(FilterChain chain)
{
this.chain = chain;
index = -1;
}
public void doFilter(ServletRequest request, ServletResponse response)
throws IOException, ServletException
{
if ( ++index < filters.size() )
{
Filter filter = filters.get(index);
if (filter instanceof AbstractFilter)
{
AbstractFilter bf = (AbstractFilter) filter;
if ( bf.matchesRequestPath(request) )
{
filter.doFilter(request, response, this);
}
else
{
this.doFilter(request, response);
}
}
else
{
filter.doFilter(request, response, this);
}
}
else
{
chain.doFilter(request, response);
}
}
}
public void init(FilterConfig filterConfig) throws ServletException
{
Context tempApplicationContext = new WebApplicationContext( filterConfig.getServletContext() );
Init init = (Init) tempApplicationContext.get(Init.class);
for ( String filterName: init.getInstalledFilters() )
{
Filter filter = (Filter) tempApplicationContext.get(filterName);
log.info( "Initializing filter: " + filterName );
filter.init(filterConfig);
filters.add(filter);
}
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException
{
new FilterChainImpl(chain).doFilter(request, response);
}
public void destroy()
{
for (Filter filter: filters)
{
filter.destroy();
}
}
}