/*
 * Copyright (c) 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     bstefanescu
 */
package org.eclipse.ecr.web.jaxrs;

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;

/**
 * Simple abstract filter that provides filter activation logic.
 *
 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
 *
 */
public abstract class HttpFilter implements Filter {

    public static final boolean getBoolean(ServletRequest request, String key) {
        return Boolean.parseBoolean((String)request.getAttribute(key));
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        if (request instanceof HttpServletRequest == false) {
            chain.doFilter(request, response);
            return;
        }
        run((HttpServletRequest)request, (HttpServletResponse)response, chain);
    }

    protected abstract void run(HttpServletRequest request, HttpServletResponse response,
            FilterChain chain) throws IOException, ServletException;

}