/*
 * Copyright (c) 2005-2011 Grameen Foundation USA
 * All rights reserved.
 *
 * 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.
 *
 * See also http://www.apache.org/licenses/LICENSE-2.0.html for an
 * explanation of the license and how it is applied.
 */

package org.mifos.servlet.filters;

import java.io.IOException;
import java.util.Enumeration;

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.HttpServletResponse;

/**
 * Servlet Filter implementation class MifosResponseHeaderFilter
 */
public class MifosResponseHeaderFilter implements Filter {
    FilterConfig fc;

    /**
     * @see Filter#destroy()
     */
    @Override
	public void destroy() {
        this.fc = null;
    }

    /**
     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
     */
    @Override
	@SuppressWarnings("unchecked")
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

        HttpServletResponse response =
            (HttpServletResponse) res;
        // set the provided HTTP response parameters
        for (Enumeration e=fc.getInitParameterNames();
                e.hasMoreElements();) {
            String headerName = (String)e.nextElement();
            response.addHeader(headerName,
                    fc.getInitParameter(headerName));
                }
        // pass the request/response on
        chain.doFilter(req, response);
    }

    /**
     * @see Filter#init(FilterConfig)
     */
    @Override
	public void init(FilterConfig fConfig) throws ServletException {
        this.fc = fConfig;
    }

}