/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. The ASF licenses this file to You
* under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License. For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.protocol.server.servlet;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.abdera.protocol.server.util.ServerUtils;
import org.apache.abdera.util.CompressionUtil;
import org.apache.abdera.util.CompressionUtil.CompressionCodec;
/**
* A filter that applies either GZip or Compress encoding on a response
* depending on the value of the Accept-Encoding request header.
*
* Note: This is currently untested
*/
public class CompressionFilter
extends AbstractFilter
implements Filter {
public void doFilter(
ServletRequest request,
ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
String encoding = req.getHeader("Accept-Encoding");
String[] encodings =
encoding != null ?
ServerUtils.orderByQ(encoding) :
new String[0];
for (String enc : encodings) {
if (CompressingResponseWrapper.canHandle(enc)) {
CompressionCodec codec = CompressionUtil.getCodec(enc);
CompressingResponseWrapper resp =
new CompressingResponseWrapper(
(HttpServletResponse) response, codec);
chain.doFilter(request, response);
resp.finish();
return;
}
}
chain.doFilter(request, response);
}
}