HttpResponseHeaderFilter.java

/*
 * Copyright (c) 2008 TouK.pl
 *
 * Licensed 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.
 */
package pl.touk.top.dictionary.webapp.util;

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;

/**
 * @author jkr@touk.pl
 */
public class HttpResponseHeaderFilter implements Filter {

    private FilterConfig filterConfig;
    
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse resp = (HttpServletResponse) response;
        Enumeration enumeration = filterConfig.getInitParameterNames();
        
        while (enumeration.hasMoreElements()) {
            String  headerName  = (String) enumeration.nextElement();
            resp.addHeader(headerName, filterConfig.getInitParameter(headerName));
        }

        chain.doFilter(request, response);
    }

    public void destroy() {
        this.filterConfig = null;
    }
}