nl.mineleni.cbsviewer.servlet.GZipFilter.java Source code

Introduction

Here is the source code for nl.mineleni.cbsviewer.servlet.GZipFilter.java

Source

/*
 * Copyright (c) 2014, Dienst Landelijk Gebied - Ministerie van Economische Zaken
 * 
 * Gepubliceerd onder de BSD 2-clause licentie, 
 * zie https://github.com/MinELenI/CBSviewer/blob/master/LICENSE.md voor de volledige licentie.
 */
package nl.mineleni.cbsviewer.servlet;

import java.io.IOException;

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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.http.HttpHeaders;

/**
 * Eenvoudige GZip compressie filter ter optimalisatie van bandbreedte.
 * 
 * @author prinsmc
 *
 */
public class GZipFilter implements Filter {

    /**
     * Comprimeert de response met GZip mits de clinet aangeeft dat die gzip
     * accepteert.
     * 
     * {@inheritDoc}
     * 
     * @param request
     *            het request
     * @param response
     *            de response
     * @param chain
     *            de filter chain
     * @throws IOException
     *             Signals that an I/O exception has occurred.
     * @throws ServletException
     *             the servlet exception
     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest,
     *      javax.servlet.ServletResponse, javax.servlet.FilterChain)
     * 
     * 
     */
    @Override
    public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        String acceptEncoding = httpRequest.getHeader(HttpHeaders.ACCEPT_ENCODING);
        if (acceptEncoding != null) {
            if (acceptEncoding.indexOf("gzip") >= 0) {
                GZIPHttpServletResponseWrapper gzipResponse = new GZIPHttpServletResponseWrapper(httpResponse);
                chain.doFilter(request, gzipResponse);
                gzipResponse.finish();
                return;
            }
        }
        chain.doFilter(request, response);
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
     */
    @Override
    public void init(final FilterConfig filterConfig) throws ServletException {
        // do nothing
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.servlet.Filter#destroy()
     */
    @Override
    public void destroy() {
        // do nothing
    }
}